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Table of contents
Overviews
����

Welcome to Quantum Innovation ����Organizing Committee

��-��Symposium Outline

��-��Program at a Glance

Programs

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��

��
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Plenary Sessions
Quantum Computing Track
Quantum Sensing Track
Quantum Cryptography &Communication Track��-��

Poster Session

��-��

Plenary Sessions

Abstrats

��-��
��-��
��-��

Quantum Computing Track
Quantum Sensing Track
Quantum Cryptography &Communication Track

Poster Presentation Awards for Young Researchers
��-��

List of Awardees

001

The International Symposium on Quantum Science,
Technology and Innovation
Welcome to Quantum Innovation 2023

It is our pleasure to invite all of you including scientists, engineers, business delegates, young researchers andstudents to Quantum Innovation 2023, the International Symposium on Quantum Science, Technology andInnovation, to be held on 15-17 November 2023 in -person.

Quantum Innovation 2023 is the third international symposium hosted by Japanese government and research

institutes, that aims to bring together multi-disciplined researchers to present and exchange breaking-throughideas in quantum science and technology.

The topics of Quantum Innovation 2023 cover the latest achievements, trends and needs in quantum scienceand technology including quantum computing, quantum sensing, quantum cryptography and quantum
communication.

We look forward to seeing you in Quantum Innovation 2023 and hope you enjoy excellent presentations fromdistinguished guests, share exciting discoveries and promote fruitful collaborations.

002

Organizing Committee
ChairsGeneral Chair

Mutsuko Hatano

Tokyo Institute of Technology

Track Chair
Quantum Computing

Track Chair
Quantum Sensing

Track Chair
Quantum Cryptography & Communication

The University of Tokyo

National Institutes for Quantum
Science and Technology（QST）

Keio University

Vice Track Chair
Quantum Computing

Vice Track Chair
Quantum Sensing

Vice Track Chair
Quantum Cryptography & Communication

Ritsumeikan University

Tokyo Institute of Technology

National Institute of Information
and Communications Technology (NICT)

Mio Murao

Shigeru Yamashita

Akinari Yokoya

Tadashi Sakai

Masahiro Takeoka

Go KatoCommittee members
Keisuke Fujii

Yusuke Kozuka

Manaka Okuyama

Shuntaro Takeda

Tatsuya Fujito

Francois Le Gall

Shinobu Onoda

Shu Tanaka

Takahiro Mori

Yutaka Shikano

Yoshimichi Tanizawa

Takashi Mukaiyama

Hiroshi Shimada

Akihisa Tomita

Kae Nemoto

Yasunari Suzuki

Noriaki Yahata

Atsushi Noguchi

Yutaka Tabuchi

Osaka University

Quantum STrategic
industry Alliance for
Revolution (Q-STAR)

Takuya Hirano

Gakushuin University

Tetsuya Ido

National Institute forMaterials Science (NIMS)
Nagoya University

National Institute ofAdvanced Industrial
Science and Technology(AIST)

National Institute ofInformation andCommunications
Technology (NICT)Tokyo Institute of Technology

Tokyo Institute of Technology

Okinawa Institute of
Science and Technology
Graduate University(OIST)

Takayuki Iwasaki

Masahiro Kitagawa
Osaka University

The University of Tokyo

Tohoku University

National Institutes for
Quantum Science andTechnology（QST）
University of Tsukuba

Quantum STrategic
industry Alliance for
Revolution (Q-STAR)

Nippon Telegraph andTelephone Corporation(NTT)

The University of Tokyo

Keio University

Toshiba Corporation

Hokkaido University

National Institutes for
Quantum Science andTechnology（QST）

RIKEN

003

Symposium Outline
Aims

Addressing the state-of-the-art
quantum technology

Exploring cooperation on research,

application, education and social awarenesson quantum technology

We will bring together researchers working on quantum technology and oﬀer a platform fordiscussions among them. Inviting prominent speakers from abroad and Japan, Quantum
Innovation 2023 covers latest development of quantum computing, quantum sensing,quantum cryptography and quantum communication.

We also aim to give young researchers, future quantum working force candidates and aware
citizens an overview of fast evolving quantum technology by listening to inspiring talks.

Scope of the Symposium

Highlights of the development of quantum
technology

Quantum Computing
Quantum Sensing

Quantum Cryptography & Communication

Development of Infrastructure for the progressof quantum technology

Promotion of practical applications of quantum technology
Development of human resources for quantum technology
Promotion of international collaborations

004

Date

15-17 November 2023
Venue

Tokyo Convention Hall
Tokyo Square Garden 5F
3-1-1 Kyobashi, Chuo-ku, Tokyo
Tokyo Convention Hall is conveniently located within walking distance of Tokyo

Station, the main hub station of Tokyo. Tokyo Convention Hall TEL : 03-5542-1995

FAX : 03-5542-1994. Click here for the website : https://www.tokyo.conventionhall.jp/eng/index.html

Schedule
15 November 2023

Plenary Sessions

16-17 November 2023

Quantum Computing Track
Quantum Sensing Track

Quantum Cryptography & Communication Track
Poster Session(16 November)

Speakers

All the speakers are to be invited.
Participants
The expected participants include researchers, engineers, business delegates, policy
makers, administrators, students, and the media people, who share interests inquantum technology and innovation.

005

Symposium Sponsors
Cabinet Oﬃce

Ministry of Internal Aﬀairs and Communications (MIC)

Ministry of Education, Culture, Sports, Science and Technology (MEXT)
Ministry of Economy, Trade and Industry (METI)
RIKEN

Japan Science and Technology Agency (JST)National Institutes for Quantum Science and Technology (QST)

National Institute of Advanced Industrial Science and Technology (AIST)

National Institute of Information and Communications Technology (NICT)
Okinawa Institute of Science and Technology Graduate University (OIST)Osaka University

The University of Tokyo
Tohoku University

Tokyo Institute of Technology

Quantum STrategic industry Alliance for Revolution (Q-STAR)

Symposium Supporters
National Institute for Material Science (NIMS)

About QIH

Quantum technology is bringing a great impact on a wide range of industry. In order toaccelerate the progress and make best use of quantum technology, industry, academia
and government are expected to collaborate on promoting basic research, technology
demonstration, industrialization, intellectual property management and humanresource development. For promoting these activities, Japan established Quantum
Technology Innovation Hubs in February 2021.

・Quantum computation pioneering hub (RIKEN)
・Quantum sensing hub (Tokyo Tech)・Foundational quantum technology and quantum life R&D hub (QST)
・Quantum material hub (NIMS)

・Quantum solution hub (Tohoku University)・hub of Quantum-based chemistry for industry development (THERS)・Quantum technology international collaboration hub (OIST)・Quantum security hub (NICT)・Quantum computer applications hub (UTokyo & Business alliance)
・Quantum software hub (Osaka University)・hub of Global research and development for business by quantum-AI technology (AIST)RIKEN serves as Headquarters of the Hubs to incorporate eﬀorts to advancequantum technology research in Japan.

006

Pr ogr am at a GlanceTracksTracksPL

CP

Plenar y Sessions

Quantum Computing Track

Contents / Topics

Contents / Topics

Welcome from Organizing Committee and Hosts,
Plenary Talks, Keynote

Quantum Computing architecture, Quantum
computers with Atoms and Ions, Photonic Quantum
Computers, Fault Tolerant Quantum Computing,
Quantum Algorithms for Chemistry, NISQ
Algorithms, Young PIs Session, Superconducing
Quantum Computing, Quantum Annealing,
Verifiable Quantum Computing, Semiconductor
Quantum Computers, Quantum Simulations

TracksTracksSE

CC

Quantum Sensing Track

Quantum Cr yptography &Communication Track

Contents / Topics

Contents / Topics

Q-sensors for Life Science, NV Center and Applications
for Life Sciences, Solid-State Quantum Sensors, 5th
IFQMS Short Presentation Session for Young
Scientists, Solid-State Quantum Sensors, Q-sensors
for Life Science, NV Center and Applications for Life
Sciences, Atom Interferometer, Atom/Ion Clocks *29th
Nov Sessions are a joint-program with The 5th IFQMS(The 5th International Forum on Quantum Metrology
and Sensing).

Quantum Internet, Young Researcher Panel Session,
Quantum Cryptography

007

All the times in the program are Japan Standard Time(GMT+�)��
Nov(Wed.)

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PL-��

��:��-��:�� Opening
��:��-��:��

Government Policy on Quantum Science and Technology

PL-��Keynotes

PL-��

Quantum Innovation Strategy in Industry

PL-��

Panel �: Social Implementation of Quantum Technologies

PL-��

Panel �: Human Resource Development in Quantum Science and Technology

PL-��

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Reception����* Q-LEAP �th IFQMS Joint Session

��Nov(Thu.)���:��-��:������

��:��-��:��

QC with Ions, Atoms andPhotonsCP-��

�:��-��:��

Solid-state Quantum Sensors
Part �

��:��-��:��

Semiconductor QC

CP-��

Superconducting QC

CP-��

Industrialization of QC

CP-��

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Solid-state Quantum Sensors
Part �

SE-��*

SE-��*

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Quantum Key Distribution
Network

��:��-��:��

Satellite Quantum
Communication

CC-��

CC-��

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Optical Quantum Sensing

SE-��*

��:��-��:��

Panel Session: Standardization CC-��
and Social Deployment

��:��-��:��

Poster Session

PO

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008

Plenary Sessions

All the times in the program are Japan Standard Time(GMT+�)�� N o v(Wed.)

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Session / Presentation

PL-��. Opening
Chairperson
WelcomeChairperson / Presenter

Aﬃliation

Yasunobu Nakamura

RIKEN

Vice-Minister, Secretary General, Science, Technology and Innovation
Policy, Cabinet Oﬃce, Government of Japan

Mutsuko Hatano

��:��WelcomeHiroki Matsuo

��:��Congratulatory Speech

Yoshimasa Hayashi

��:����:��-��:��

Coﬀee Break

PL-��. Government Policy on Quantum Science andTechnology
Chairperson

Yasunobu Nakamura

��:��Strategy of quantum future industry development

Daisuke Kawakami

��:��The U.S. National Quantum Initiative

Tanner Crowder

��:��Quantum technology in the European Union

Peter Fatelnig

��:����:��-��:��
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��:��-��:��Lunch

PL-��. Keynotes

Parliamentary Association for Quantum Technology Promotion

RIKEN

Deputy Secretary General for Secretariat of Science, Technology
and Innovation Policy, Cabinet Oﬃce
Policy Analyst, National Quantum Coordination Oﬃce, Oﬃce of
Science and Technology Policy Executive Oﬃce of the President
Minister Counsellor, Delegation of the EU to Japan

PL-��-��PL-��-��PL-��-��Yasuhiko Arakawa

UTokyoAdvancing the quantum economy through sensors
and standards

Barbara Goldstein

NIST

Shunsuke Okada

Q-STAR

George Robinson

PL-��-��

The Quantum Economic Development Consortium(QED-C): Growing the quantum industry

AQA

Celia Merzbacher

QED-C

PL-��-��

Introduction of Q-STAR -Create industries &businesses with quantum technology

Tim Prior

UKQuantum

PL-��-��Taro Shimada

Q-STAR

PL-��-��

Akihisa Tomita

Quantum ICT Forum/Hokkaido U

PL-��-��

Masahiro Horibe

AIST

Hidetaka Takano

Q-STAR

Challenges in superconducting quantum computing

PL-��. Quantum Innovation Strategy in Industry
Chairperson

Introduction of the Australian Quantum Association(AQA)

UK Quantum, the UK’s quantum industry trade body

Supporting collaboration between academia andindustry for quantum innovation

Yasunobu Nakamura

RIKEN

PL-��-��PL-��-��

Coﬀee Break

PL-��. Panel �: Social Implementation of Quantum
Technologies

Celia Merzbacher
George Robinson
Tim Prior

PL-��. Panel �: Human Resource Development in
Quantum Science and Technology
Chairperson

Yu ChenReception

QED-C
AQA

UKQuantum
GoogleKae Nemoto

OIST

Eleni Diamanti

Sorbonne U

Peter Turner

Shinya Ogata
��:��General Chair, Quantum Innovation ���� Organizing Committee

Chairperson

Chairperson

��:��-��:��

Abstract PDF

Celia Merzbacher

Sydney Quantum Academy
Q-STAR
QED-C

009

Quantum Computing Track

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Session / Presentation

Chairperson / Presenter

Aﬃliation

Shuntaro Takeda

UTokyoTakao Aoki

Waseda U

Philip Walther

U Vienna

Chairperson

Yusuke Kozuka

NIMS

Semiconductor integration technology for realization of silicon quantum
computers

RIKEN

CP-��-��Noriyuki Lee

HitachiCP-��-��Takahiro Mori

AIST

Chairperson

Yutaka Tabuchi

RIKEN

Niobium-nitride-based superconducting qubits

Summi Kim

NICT

CP-��. QC with Ions, Atoms and Photons
Chairperson

Nanoﬁber cavity quantum electrodynamics systems for distributed
quantum computing
Photonic quantum machine learning

Quantum science with tweezer arrays
Coﬀee Break

CP-��. Semiconductor QC
Electron and hole spin qubits in silicon

Chairperson

Recent progress on graphene quantum dot devices
Lunch

CP-��. Superconducting QC
Beyond-classical quantum computing with superconducting circuits
CP-��. Industrialization of QC

Manuel Endres

Leon Camenzind

Takuya Iwasaki

Yu ChenCaltech

NIMS

GoogleAbstract PDF

CP-��-��
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CP-��-��

CP-��-��
CP-��-��

Chairperson

Shu Tanaka

Keio UNEC

CP-��-��

Session / Presentation

Chairperson / Presenter

Aﬃliation

Abstract PDF

Shu Tanaka

Keio U

Tadashi Kadowaki

AIST / DENSO

CP-��-��Taisuke Iwai

Q-STAR

CP-��-��

Chairperson

Shigeru Yamashita

Ritsumeikan U

How many qubits do you need, really?

Mathias Soeken

Usecases by quantum technologies for social contribution

CP-��. Quantum Annealing
Chairperson

Quantum CAE: automation in science with quantum computing andmachine learning

Quantum inspired computing: technology & strategy and applications
Coﬀee Break

CP-��. Toward FTQC
Low-cost quantum error correction using looped pipelines

Yuichi Nakamura

Zhenyu Cai

U Oxford

CP-��-��Yutaro Akahoshi

FujitsuCP-��-��

Chairperson

Keisuke Fujii

Osaka U / RIKEN

Beyond classical machine learning: new insights on quantum machinelearning

IBM Quantum

CP-��-��

Soﬁene Jerbi

Freie U

CP-��-��Keita Kanno

QunaSys

Mio Murao

UTokyoJens Eisert

Freie U

CP-��-��

Takashi YamakawaNTT

CP-��-��

Partially fault-tolerant quantum computing architecture witherror-corrected Cliﬀord gates and space-time eﬃcient analog rotations

Microsoft Research

CP-��-��

Lunch

CP-��. NISQ Algorithms
Perspectives on the current state of quantum computing systems capability

Generalized quantum subspace expansion for quantum error mitigation
Quantum chemistry on NISQ devices beyond variational quantum
algorithms

Hanhee Paik

Suguru Endo

NTT

Break

CP-��. Quantum Algorithms and Foundation
Chairperson

Do quantum computers have applications in machine learning andcombinatorial optimization?
Veriﬁable quantum advantage without structure

Theoretical foundations of quantum advantage in quantum algorithms

François Le Gall

Nagoya U

CP-��-��
CP-��-��

CP-��-��

010

Quantum Sensing Track

All the times in the program are Japan Standard Time(GMT+�)* Q-LEAP �th IFQMS Joint Session

�� N o v(Thu.)

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Session / Presentation

Chairperson / Presenter

Aﬃliation

Chairperson

Norikazu Mizuoch

Kyoto U

Diamond-based magnetometer with dc sensitivity below �� pT Hz^-�/� formagnetoencephalography

Naota Sekiguchi

Tokyo Tech

SE-��-��

Junko Ishi-Hayase

Keio U

SE-��-��

Chairperson

Takayuki Iwasaki

Tokyo Tech

Plasma CVD engineering of diamond nitrogen-vacancy centers for quantum
sensing

Wigner RCP / BME

SE-��-��

Hiromitsu Kato

AIST

SE-��-��

Kensuke Kobayashi

UTokyoSE-��-��

Chairperson

Shigeki Takeuchi

Kyoto U

Quantum enhancement towards sensitive molecular vibrational imaging

Yasuyuki Ozeki

UTokyoSE-��*. Solid-state Quantum Sensors Part �
Quantum sensing: the promise, the challenge, and the path ahead

Double/Triple resonance of electron spin in diamond: Quantum sensing
and manipulation

Danielle Braje

MIT

Abstract PDF

SE-��-��

Coﬀee BreakSE-��*. Solid-state Quantum Sensors Part �
Basic properties and quantum control of diamond qubits

Magnetic ﬁeld imaging using quantum sensors for condensed matterphysics

Adam Gali

Lunch

SE-��*. Optical Quantum Sensing
Mid-IR quantum sensing with entangled photons

Reaching the quantum limit with a gravitational-wave telescope

Sven Ramelow

Kentaro Somiya

Humboldt U

SE-��-��

Tokyo Tech

SE-��-��

SE-��-��

Chairperson / Presenter

Aﬃliation

Chairperson

Noriaki Yahata

QST

Quantum computing in chemistry, molecular biology, and materials
science

QuantumBasel

SE-��-��Markus Reiher

ETH Zürich

SE-��-��

Exploring the quantum acceleration of machine learning in neural data
analysis

Kei Majima

QST

SE-��-��

Application of quantum annealing to quantum sensing

Yuya Seki

Yuichiro Matsuzaki

Keio U

SE-��-��

Chairperson

Keisuke Fujii

Osaka U

Hyperpolarized spin sensing of metabolic processes in a brain

Makoto Negoro

Osaka U / QST

Session / Presentation

SE-��*. Quantum Life Sciences Meets Quantum Computing Part �
The state of quantum computing applications in health and medicine

Expansion of the scope of quantum annealingCoﬀee BreakSE-��. Quantum Life Sciences Meets Quantum Computing Part �
Quantum cognition? The subatomic frontier of brain researchSome steps towards enabling practical quantum computing of
biomolecules

Frederik Flöther

Matthew Fisher

Chuo U

Abstract PDF

SE-��-��

UCSB

SE-��-��

Wataru Mizukami

Osaka U

SE-��-��

Tetsuo Kishimoto

UEC

Ron Folman

Ben-Gurion U

SE-��-��

Kosuke Shibata

Gakushuin U

SE-��-��

Rekishu Yamazaki

ICUDavid Leibrandt

UCLA

Atsushi Yamaguchi

RIKEN

Lunch

SE-��. Atom Interferometer
Chairperson

Can a rock be a wave? From ��� years of de-Broglie's wave-particle duality
to quantum-gravity
Precise magnetometer with a Bose-Einstein condensate
BreakSE-��. Atom/Ion Clocks
Chairperson

Trapped-ion optical atomic clocks: from fundamental physics to quantum
sensing
Laser spectroscopy of triply charged Th-��� toward a nuclear clock

SE-��-��

011

Quantum Cryptography & Communication Track
All the times in the program are Japan Standard Time(GMT+�)�� N o v(Thu.)

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Session / Presentation

Chairperson / Presenter

Aﬃliation

Chairperson

Akihisa Tomita

Hokkaido U

Quantum key distribution research and development in NEC

Kenichiro YoshinoNECCC-��. Quantum Key Distribution Network
Research and demonstration activities of Toshiba on QKD

Research on quantum-secured networking: QKD for networks and networks
for QKD

Keisuke Mera

ToshibaCC-��-��

Chankyun Lee

KISTI

CC-��-��

Go Kato

NICT

CC-��. Satellite Quantum Communication
Chairperson

EuroQCI: A quantum communication infrastructure for Europe's digital
decadeClassic space optical communication technology will realize satellite QKDSpace laser communication and our technologies
LunchCC-��. Panel Session: Standardization and Social Deployment
ChairpersonPeter Fatelnig
Tomohiro Araki

Kyohei Iwamoto

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CC-��-��

SONY

CC-��-��

JAXA

NICT

Oleg Nikiforov

DT

Katsuyuki Hanai

Eleni Diamanti(Fri.)

Delegation of the European
Union to Japan

Masahide Sasaki

Akihiro Mizutani

�:��-��:��CC-��-��

Coﬀee Break

Gregoire Ribordy

�� N o v

Abstract PDF

CC-��-��Q-STARIDQ

U Toyama
CNRS

Chairperson / Presenter

Aﬃliation

Chairperson

Takuya Hirano

Gakushuin U

Numerical method for security analysis of quantum key distribution basedon complementarity

Toshihiko Sasaki

UTokyoCC-��-��

Mikio Fujiwara

NICT

CC-��-��

Masahiro Takeoka

Keio UU ArizonaCC-��-��

Yoshiaki Tsujimoto

NICT

CC-��-��

Alto Osada

Osaka U / UTokyo

CC-��-��

Chairperson

Nicolo Lo Piparo

OISTInter-node quantum operations and assessment of devices for suchoperations

U OxfordCC-��-��

Akihito Soeda

NII

CC-��-��David Elkouss

OIST

CC-��-��

Session / Presentation

CC-��. Quantum Cryptography: Present and Prospects
Quantum delegation with an oﬀ-the-shelf device

Quantum key distribution network and quantum internet toward next
generation communication infrastructure

Anne Broadbent

uOttawa

Abstract PDF

CC-��-��

Coﬀee BreakCC-��. Quantum Internet Part �Chairperson

Building the quantum internet

Generation and manipulation of telecom photons towards quantum
internet
Prospects for quantum network using trapped-ion quantum nodes
LunchCC-��. Quantum Internet Part �Privacy for the paranoid ones - the ultimate limits of secrecy

Characterization and optimization of quantumrepeater networks

Saikat Guha

Artur Ekert

012

Poster Session
PO-CP : Posters on Quantum Computing
All the times in the program are Japan Standard Time(GMT+�)�� N o v(Thu.)

��:��-��:��

Session / Presentation

Chairperson / Presenter

Aﬃliation

Abstract PDF

Characterising the hierarchy of multi-time quantum processes withclassical memory

Philip Taranto

UTokyoPO-CP-��

Satoshi Yoshida

UTokyoPO-CP-��Timothy Forrer

UTokyoPO-CP-��

Tatsuki Odake

UTokyoPO-CP-��

Eﬃcient decoding of stabilizer code by single-qubit local operations andclassical communication

Koki Shiraishi

UTokyoPO-CP-��Quantum error correction with dissipatively stabilized squeezed-cat qubits
Revealing nonlocality in boson sampling

Fernando Quijandria

PO-CP-��Resonant image charge detection for e-@He qubit

Jun-Yi Wu

OISTMikhail Belianchikov

OIST

PO-CP-��

Universal, deterministic, and exact protocol to reverse qubit-unitary andqubit-encoding isometry operations
Entanglement-eﬃcient bipartite-distributed quantum computing withentanglement-assisted packing processes

Quantum algorithms for transforming Hamiltonian dynamics: simulatingwide-ranging Hamiltonian dynamics

Spin-dependent harmonic traps for electrons on liquid helium

Increasing quantum volume through distributed quantum computing

Quantum ridgelet transform: winning lottery ticket of neural networks withquantum computation

Mohamed Hatiﬁ
Shao-Hua Hu

Tamkang U
OISTTamkang U

PO-CP-��
PO-CP-��
PO-CP-��

Hayata Yamasaki

UTokyoPO-CP-��Natalia Morais

OIST

PO-CP-��Space-bounded quantum state testing via space-eﬃcient quantum singularvalue transformation

Yupan Liu

Nagoya U

PO-CP-��

Time-domain three-mode universal linear optical operations with adual-loop-based circuit

Nicolo Lo Piparo

OIST

PO-CP-��

Takato Yoshida

UTokyoPO-CP-��Keitaro Anai

UTokyoPO-CP-��

Masashi Yamashita

Keio U

PO-CP-��

Aree Taguchi

U Tsukuba

PO-CP-��

Zanhe Qi

Ritsumeikan U

PO-CP-��David Clarino

Ritsumeikan U

PO-CP-��Classical circuit simulation s of superconducting quantum computer using
conventional SPICE

Tetsufumi Tanamoto

Teikyo U

PO-CP-��

Circuit division based on reinforcement learning to optimize Steiner-Gausselimination for NNA-compliant quantum circuit synthesis

Ryutaro Ohira

QuEL

PO-CP-��

Huan Yu

Ritsumeikan U

PO-CP-��Nathan Lysne

NIST

PO-CP-��High generation rates of Fock states for ultra-fast optical quantum
computers

Kazuma Takahashi

UTokyoPO-CP-��Quantum Metropolis-Hastings algorithm with the target distribution
calculated by quantum Monte Carlo integration

Hironari Nagayoshi

UTokyoPO-CP-��

Koichi Miyamoto

Osaka U

PO-CP-��Interface enabling classical and quantum hybrid algorithms to simulate
various realistic chemical systems

Tomoya Shiota

Osaka U

PO-CP-��Energy-consumption advantage of quantum computation

Variational quantum algorithm for partial singular value decomposition

Florian Meier

VCQ

PO-CP-��

Eﬃcient concatenated bosonic code for additive Gaussian noise

Shohei Miyakoshi
Kosuke Fukui

UTokyoPO-CP-��

Towards quasioptical microwave ﬁeld enhancement for electrons on liquid
heliumQuantum multiplexing applied to the quantum Reed-Solomon code

Demonstration of continuous-variable quantum approximate optimization
for quadratic functions with a photonic quantum processor

A hybrid algorithm using annealing machines for large problems with many
constraints
Fluorescence spectra of a driven nonlinear oscillator with weak Kerr
nonlinearity

Optimal mapping to nearest-neighbor architectures by appling simulated
annealing-based Gaussian elimination iterator
Leveraging diﬀerent Boolean function decompositions to optimize
LUT-based quantum circuit synthesis

QuEL-�: a scalable quantum control system for superconducting qubits

Control over a shared phonon between trapped ions in a two-dimensional
array for quantum simulation

Graphical approach for characterization of non-Gaussian quantum process

The second law of information thermodynamics in feedback control with ageneral quantum measurement process
Distributed search on graphs using discrete time quantum walk

Correlated oscillations in Kerr parametric oscillators with tunable eﬀective
coupling
A novel method for power spectrum evaluation

Achieving scalable quantum error correction with union-ﬁnd on systolicsrrays by using multi-context processing elements
Progressing towards the transmission of spin qubit in mid-range forquantum computing application

Osaka U

PO-CP-��

Shintaro Minagawa

Nagoya U

PO-CP-��

Mathieu Roget

Aix-Marseille U

PO-CP-��

Tomohiro Yamaji

NECPO-CP-��

Katsuta Sakai

TMDU

PO-CP-��

Jan Wichmann

RIKEN

PO-CP-��

Rajkumar Chinnasamy

Osaka U

PO-CP-��

013

�� N o v

(Thu.)

��:��-��:��

Session / Presentation

Chairperson / Presenter

Aﬃliation

Four-body interaction of Josephson parametric oscillators for quantum
computation

Ryoji Miyazaki

NECPO-CP-��

Zhiyu Jiang

Hokkaido U

PO-CP-��

Kazuhisa Ogawa

Osaka U

PO-CP-��

Fumiya Hanamura

UTokyoPO-CP-��

Viktor Khinevich

Osaka U

PO-CP-��

Incorporating missing electron correlations into quantum chemical
calculations with quantum computers utilizing classical coupled cluster
theoryLuca Erhart

Osaka U

PO-CP-��

The Moonshot R&D Program of cold-atom quantum computer

Sylvain de Lesleuc
Akane Makino

IMS

PO-CP-��

Z_� point-gap topology of a non-unitary quantum walk with time-reversal
symmetry
Feasibility of superconducting quantum computation using two-qubit
gates with static ZZ interaction

Experimental realization of displacement detection beyond classical limit
using single-photon states
Enhancing quantum computations with the synergy of auxiliary ﬁeld
quantum Monte-Carlo and computational basis tomography

The rubidium cold-atom quantum computer, a Moonshot Project

Characterization of chirped Bragg grating for cold-atom quantum
computing applications

IMS

Abstract PDF

PO-CP-��

Arnab Maity

IMS

PO-CP-��

Leon Camenzind

RIKEN

PO-CP-��

Akihiro Yatabe

RIKEN

PO-CP-��

Towards coherent excitation to Rydberg states using home-made lasers

Karthikeyan Ganesan

IMS

PO-CP-��Proposal of multidimensional quantum walks to explore Dirac andSchroedinger systems

Manami Yamagishi

UTokyo / RIKEN

PO-CP-��

Towards large-scale quantum processors in silicon

Low-rank approximations and selection of results in quantum circuit
simulation in tensor networks
Development of an ion-shuttling system for the QCCD architecture

Tatsuya Oshio

Osaka U

PO-CP-��

014

Poster Session
PO-SE : Posters on Quantum Sensing
All the times in the program are Japan Standard Time(GMT+�)�� N o v(Thu.)

��:��-��:��

Session / Presentation

Chairperson / Presenter

Aﬃliation

Probing exciton dynamics with spectral selectivity through the use ofentangled photons: application to the study of photosynthetic
light-harvesting systems

Yuta Fujihashi

UEC

PO-SE-��

Hinata Takidera

UTokyoPO-SE-��

Frederick Tze Kit So

Kyoto U

PO-SE-��

Masanori Fujiwara

Kyoto U

PO-SE-��

Nene Hariki

Kyoto U

PO-SE-��Zehan Li

Tokyo Tech

PO-SE-��

Kosuke Kimura

Gunma U

PO-SE-��

Teruo Kohashi

Hitachi

PO-SE-��

Ozora Iso

UEC

PO-SE-��

Magnetoencephalography with wearable magnetometers and active noise
canceler for real-time tracking and denoising

Xinyu Cao

UTokyoPO-SE-��

Development of a wearable active magnetic shield for magnetoencephalography under head motion

Yoki Nishi

Tokyo Tech

PO-SE-��

Soichiro Shido

UTokyoPO-SE-��

Satoru Mima

NICT

PO-SE-��

Ryusei Okaniwa

Keio U

Wideﬁeld imaging of the magnetization process in soft magnetic-thin ﬁlm
using diamond quantum sensors

PO-SE-��

Ryota Kitagawa

Tokyo Tech

Spectral modulation by temporal manipulation of a biphoton wave packet
Toward improvement of waveguide-based squeezing at ���nm

Yuki Okura

PO-SE-��

UEC

PO-SE-��

Imaging AC magnetization response of soft magnetic thin ﬁlm using
diamond quantum sensors

Shiori Koiso
Aoi Nakatsuka

Tokyo Tech

PO-SE-��

UEC

PO-SE-��Wenyu Shang

UTokyoPO-SE-��Takeyuki Tsuji

Tokyo Tech

PO-SE-��Yuta Araki

Tokyo Tech

PO-SE-��

Motofumi Fushimi

UTokyoPO-SE-��

Riku Kawase

Kyoto U

PO-SE-��

Coupling nitrogen vacancy centres for sensitivity improvement

David Herbschleb

Kyoto U

PO-SE-��

Stress imaging of ensemble NV diamond layer

Yukako Kato

AIST

PO-SE-��

Measurement of reﬂection phase diﬀerence between s-polarization andp-polarization
Nitrogen-vacancy centres in silicon-doped detonation nanodiamonds
Creation of NV centers in diamond over a wide region by single-shot
femtosecond laser pulse

Group IV color centers in detonation nanodiamonds for temperaturesensing
Investigation on sensitivity parameter of diamond quantum sensors
controlled by continuously excited Ramsey protocol
Quantum state tomography with NV-NV pair for quantum sensing
application
Study of NVC probe fabricated by focused ion beam

Biphoton spectral measurement with delay-line-anode single-photon
detectors

Loss reduction of SiN waveguide in green light for diamond NV excitation

Evaluation of a superconducting nanowire single photon detector for
mid-infrared
CW-ODMR-based frequency-tunable magnetometry utilizing RF
double-dressed states with nitrogen-vacancy centers in diamond

Development of a hybrid atomic gravimeter for ﬁeld gravity measurements
Reconstruction of cardiac current source by magnetocardiography withcylindrical sensor array

Increasing T�* of ensemble NV centers by reduction of stress distribution in
CVD diamond ﬁlm
Continuously excited - Ramsey simulation for high sensitive magnetometry
Measurement of somatosensory evoked potentials against whisker
stimulation for high-resolution magnetoencephalography of small animals

Control of impurity incorporation into CVD diamond toward long coherencetime of the NV center by optimizing pressure
Robust quantum sensing via the standard deviation

Dipole-dipole interaction between NV- center and various nitrogen related
defects

Kaito Takamura

David Herbschleb

Gakushuin U

Kyoto U

Abstract PDF

PO-SE-��

PO-SE-��

Chikara Shinei

NIMS

PO-SE-��

Shuya Ishii

QST

PO-SE-��

Takumi Mikawa

Keio U

PO-SE-��

Tomoaki Tanaka

QST

PO-SE-��Atsumi Yoshimura

Tokyo Tech

PO-SE-��Rui Suzuki

Keio U

PO-SE-��

Charge state manipulation of nitrogen vacancy centers by using diamond
MOS structure

Moriyoshi Haruyama

AIST

PO-SE-��

Development of diamond NV magnetometry with optical ﬁber array

Experimental criteria for the classiﬁcation of multi-photon correlations

Akihiro Kuwahata

Tohoku U

PO-SE-��

Ultrasensitive solid-state nuclear gyroscope based on diamond

Geobae Park

Anshuman Nayak

OISTPO-SE-��Creation of NV- center in type-Ib diamonds by high temperature
post-annealing for quantum sensing

Electron-spin double resonance in diamond under a strong RF ﬁeld

Simultaneous magnetic ﬁeld and temperature measurements bysimultaneously-resonated optically detected magnetic resonance using
silicon vacancy quantum sensor: reduction of measurement time by time
dividing method

Development of sensitive diamond quantum sensor for detecting the brain
magnetic ﬁeld of a living rat
Analysis of electron spin double resonance spectra in diamond using
Lindblad master equation

A diamond chiral waveguide structure for nanoscale magnetometry

Kosuke Takada

Kyoto U
TUT

PO-SE-��
PO-SE-��

015

�� N o v

(Thu.)

��:��-��:��

Session / Presentation

Chairperson / Presenter

Aﬃliation

Massive quantum superpositions using superconducting magnetomechanics

Shilu Tian

OIST

Quantum infrared spectroscopy with ATR method

Shilu Tian

Torataro Kurita

OIST

Hiroaki Otsuka

Waseda U

Naoki Kimata

Waseda U

PO-SE-��

Akihiro Nishiyama

Kobe U

PO-SE-��Takuya Sekikawa

JAEA

PO-SE-��

Sota Onuma

Ibaraki U

PO-SE-��Keita Takeda

Tokyo Tech

PO-SE-��Keita Ikeda

Tokyo Tech

PO-SE-��Kazuki Oba

Tokyo Tech

Feedback cooling of magnetically-levitated cm-size resonators

Tyrosine ��� may play a key role in the radical pair mechanism throughbifurcation in the light initiated redox reaction

Functional analyses of chicken cryptochrome �, a candidate molecule ofmagnetoreception
Holographic brain theory: super-radiance, memory capacity and control
theoryFirst-principles calculations of DNA irradiated with a proton and a carbon
ion beam
Electronic states of a ﬂuorinated DNA base, nucleoside and nucleotide
revealed by synchrotron X-ray photoemission spectroscopy
Charge state control of tin-vacancy centers in diamond using surface
termination
Exploring charge-state dynamics of tin-vacancy in diamond by
time-resolved measurements
Long spin relaxation time of a lead-vacancy center in diamond

Theoretical and experimental approach to investigate change of heat-ﬂux
in a cell exposed to radiation stress
Why do enzyme assemblies activate enzymatic reactions?
A diamond quantum sensor for electrical metrology

Eﬀects of optical excitation on the Ramsey magnetometry of ensemble NV
centers in diamond

Kyoto U

Keiko Hanazawa

Ibaraki U

Tomoto Ura

QST

Hidekazu Muramatsu

Tokyo Tech

Abstract PDF

PO-SE-��
PO-SE-��
PO-SE-��
PO-SE-��

PO-SE-��
PO-SE-��
PO-SE-��
PO-SE-��Yusei Aoki

Tokyo Tech

PO-SE-��Yuta Kainuma

Tokyo Tech

PO-SE-��

Current monitoring for electric vehicle batteries using heteroepitaxial CVD
diamond quantum sensors

Kenichi Kajiyama

Tokyo Tech

PO-SE-��

Rotational cavity magnomechanics

Anil Kumar

Kani Mohamed

OIST

PO-SE-��

Highly sensitive compact quantum sensor with NV center in angle-shaped
diamondTuneable Gaussian entanglement in levitated nanoparticle arrays

OIST

PO-SE-��

016

Poster Session
PO-CC : Posters on Quantum Cryptography & Communication
All the times in the program are Japan Standard Time(GMT+�)�� N o v(Thu.)

��:��-��:��

Session / Presentation

Chairperson / Presenter

Aﬃliation

Abstract PDF

Performance comparison of the two reconstruction methods forstabilizer-based quantum secret sharing

Shogo Chiwaki

Tokyo Tech

PO-CC-��Daiki Hara

Osaka U

PO-CC-��

Kazufumi Tanji

Keio U

PO-CC-��

A scheme of reducing the eﬀects of the two-photon temporal distinguishability on measurement-device-independent quantum key distribution

Haobo Ge

Hokkaido U

PO-CC-��

Loss tolerant distribution of GHZ-state in a star optical network

Polarization-entangled biphoton frequency comb for DWDM technology

Hikaru Shimizu

Keio U

PO-CC-��

Improved eﬃciency of photon echo generation from quantum dots using
chirped pulses

Toshiki Kobayashi
Yutaro Kinoshita

Keio U

Haruki Emori

Hokkaido U

PO-CC-��

Masashi Ito

Toshiba

Interoperable key relay and management between heterogeneous QKD
networks

Mayuko Koezuka

Toshiba

PO-CC-��

Macroscopic state and entropy

Observation of frequency-multiplexed Hong-Ou-Mandel interference

Teruaki Nagasawa

Nagoya U

PO-CC-��

Performance of rotation-symmetric bosonic codes in a quantum repeater

Mayuka Ichihara
Peizhe Li

SOKENDAI

PO-CC-��

Polarization-entangled photon pair generation with a pulse excited tandem
type-II QPM PPLN waveguideEﬀects of spontaneous emission and the pump pulse waveform in photonic
interconnect of distant ion-cavity systems

Error and disturbance as irreversibility

Evaluation of multiplexed quantum key distribution system using network
simulator

Entanglement distribution between quantum memories based on
single-photon interference requiring mild stability

Osaka UYNU

PO-CC-��

PO-CC-��
PO-CC-��

PO-CC-��

Daisuke Yoshida

YNU

Ananda Maity

OIST

Takahiko SatohKeio U

Hyensoo Choi

Keio U

PO-CC-��

Tomoki Tsuno

YNU
Keio U

PO-CC-��Design of hardware monitor for quantum repeater software architecture

Amin Taherkhani

Private quantum signal processing

Yuto Nishikubo

Mie U

Noise is resource contextual in quantum communication

Framework for comparing classical and quantum computers with uniﬁed
rules online applications
Quantum algorithms for routing on quantum repeater networks

Study on cavity-enhanced spontaneous parametric down conversion
sources for long-distance quantum communication
Quantum resource theory of Bell nonlocality in Hilbert spaceLong distance continuous-variable quantum key distribution withdiscrete-modulated coherent state and two-mode squeezed vacuum

Coherent microwave-to-optical quantum transduction using diamond
optomechanical crystals with a color center
RuleSet-based recursive quantum internetworking

Wojciech Roga

Keio U

PO-CC-��
PO-CC-��
PO-CC-��

PO-CC-��
PO-CC-��
PO-CC-��

Makoto Ishihara

Keio U

Byunggi Kim

UTokyoPO-CC-��Kentaro Teramoto

Mercari

PO-CC-��

PO-CC-��

017

A bst r act s

TracksTracksPL

CP

Plenar y Sessions

Quantum Computing Track

Contents / Topics

Contents / Topics

Welcome from Organizing Committee and Hosts,
Plenary Talks, Keynote

Quantum Computing architecture, Quantum
computers with Atoms and Ions, Photonic Quantum
Computers, Fault Tolerant Quantum Computing,
Quantum Algorithms for Chemistry, NISQ
Algorithms, Young PIs Session, Superconducing
Quantum Computing, Quantum Annealing,
Verifiable Quantum Computing, Semiconductor
Quantum Computers, Quantum Simulations

TracksTracksSE

CC

Quantum Sensing Track

Quantum Cr yptography &Communication Track

Contents / Topics

Contents / Topics

Q-sensors for Life Science, NV Center and Applications
for Life Sciences, Solid-State Quantum Sensors, 5th
IFQMS Short Presentation Session for Young
Scientists, Solid-State Quantum Sensors, Q-sensors
for Life Science, NV Center and Applications for Life
Sciences, Atom Interferometer, Atom/Ion Clocks *29th
Nov Sessions are a joint-program with The 5th IFQMS(The 5th International Forum on Quantum Metrology
and Sensing).

Quantum Internet, Young Researcher Panel Session,
Quantum Cryptography018

PL-02-01

Strategy of quantum future industry
development
Daisuke KAWAKAMI
Cabinet Office

Biography
Dr. Daisuke KAWAKAMI graduated from Kyoto University and completed
master’s program in chemistry, Graduate School of Science, Kyoto
University in 1993. He joined Toray Industries, Inc., and was assigned to
Fibers & Textiles Research Laboratory in 1993. He received Ph.D. inengineering from Graduate School of Organic Engineering, Faculty ofEngineering, Tokyo Institute of Technology in 2008. He has been the vicepresident of Toray Industries (America), Inc. since 2016. After serving as
Director for Life Innovation Business Strategy Planning Department from2016 to 2023, he was appointed as Deputy Director General for Science,
Technology and Innovation Policy, Cabinet Office, in 2023.

Abstract
In April 2022, Japanese Government compiled “ Vision of Quantum Future
Society,” which has established the vision and goals to be achieved byquantum technology. The goals by 2030 are “10 million quantum
technology users,” “Through quantum technology, production to 50
trillion Yen,” and “Fostering quantum unicorn companies to create future
markets.” The new “Strategy of Quantum Future Industry Development,”
established this past April, summarizes the priority actions to realize thegoals by making quantum technology practically-applied andindustrialized. This presentation overviews an overall policy of Japan onquantum technology research and development.

019

PL-02-02

The U.S. National Quantum Initiative
Tanner Crowder
Office of Science and Technology Policy

Abstract
The United States launched the National Quantum Initiative in 2018 toaccelerate quantum information science research and development
across the nation. The National Quantum Initiative prioritizes getting thescience right, enhancing competitiveness, and enabling people. This talkwill discuss some of the developments in the National Quantum Initiative;
for more information about the initiative, see www.quantum.gov.

020

PL-02-03

Quantum technology in the European Union
Peter Fatelnig
Delegation of the European Union to Japan

BiographyPeter Fatelnig is the Minister-Counsellor for Digital Economy Policy at theDelegation of the European Union to Japan, in Tokyo. Digital economy
policy is a top-priority in EU-Japan relations. His work is instrumental in
implementing the Digital Partnership Agreement and drives theconversation on key European policies such as the Digital Services Act,on AI or Quantum, on data flows and cyber. He is committed to a positive
European vision for a society and an economy increasingly benefitingfrom digital technologies.
Prior to his current role, from 2018 to 2023, Peter managed the digital
economy portfolio at the Delegation of the European Union to the UnitedStates, including the Trade & Technology Council. Before joining theEuropean External Action Service, Peter was a senior manager at theEuropean Commission where he started in 1998.
Peter began his international career by working on assignments for the
strategy-consulting firm American Management Systems, and for theEuropean Space Agency, in the Netherlands. Peter holds a Master degreein Communication Engineering from the University of Technology in Graz,
Austria, and is a senior member of the IEEE and alumni of the ’93 class of
the International Space University. He is married and has raised two
daughters.

Abstract
In this presentation about Quantum Technology in the European Union, I
explore the growing potential of quantum technologies and the EU’s

021

vision to remain a global leader. The presentation discusses different
application areas, such as enhancing MRI capabilities for early cancer
detection or conducting virtual drug trials. It delves into quantum
communication initiatives, aiming for unbreakable codes, and highlights
gravimeter applications to probe underground resources. Building on thetransformative power of quantum technologies, we can envision realtime simulations in finance, engineering, and climate change.
Furthermore, the conversation shows the potential of quantum
technologies in space exploration and defence applications. The EUʼsearly commitment to pioneering advancements in Quantum Technology
underscores its ambition to be at the forefront of the global quantum
revolution.

022

PL-03-01

Challenges in superconducting quantum
computing
Yasunobu Nakamura
RIKEN Center for Quantum Computing

Biography
Yasu Nakamura started his research career at NEC Fundamental ResearchLaboratories in 1992, where he demonstrated the first coherent
manipulation of a superconducting qubit in 1999 and met quantum
information science. He also spent a year as a Visiting Researcher at TU
Delft from 2001 to 2002. Since 2012, he has been a Professor at The
University of Tokyo. He has also been leading his research team at RIKEN
since 2014. He is currently the Director of the RIKEN Center for Quantum
Computing and the Project Leader of the MEXT Q-LEAP Flagship projecton Superconducting Quantum Computing.

Abstract
Research and development of superconducting quantum computing
have made significant progress since the first demonstration of asuperconducting qubit in 1999. Thanks to the nearly six orders ofmagnitude improvement of the coherence time and more sophisticatedcircuit designs and operations, the fidelities of gate control and readout
are now approaching and surpassing the threshold for fault-tolerant
quantum computation. Many groups worldwide are competing
intensively toward larger-scale superconducting quantum computing
with better coherence and fidelity that allow for quantum error
correction and fault tolerance. At the RIKEN Center for Quantum
Computing, we pursue a scalable architecture using all-microwave
control and readout on a two-dimensional array of frequency-fixed023

transmon qubits. Our scheme uses a substrate pierced with a dense arrayof through-silicon vias and vertical access of coaxial cables from thebackside of the substrate. We present the current status of our researchand discuss the challenges ahead.

024

PL-03-02

Advancing the quantum economy throughsensors and standards
Barbara Lynne Goldstein
National Institute of Standards and Technology

Biography
Ms. Barbara Goldstein serves as Associate Director of the PhysicalMeasurement Laboratory of NIST. PML, consisting of about 1300 staff andassociates and two joint institutes, realizes and disseminates precision
measurements to support commerce, defense and research.
Ms. Goldstein leads the “NIST on a Chip” program which is developing asuite of quantum sensors to deliver traceable, embeddable
measurements directly to point-of-use. She is also a leader ininternational quantum standardization. She convenes/leads multiple
efforts, including a working group of the IEC Standards Evaluation Groupon quantum technologies (SEG 14), the international IMEKO TC25 onquantum measurement and quantum information, and a new effort she
initiated to foster collaboration across metrology institutes to advancethe quantum economy. She served as an Embassy Science Fellow in
2021, hosted by the U.S. Embassies in the Netherlands, Denmark and
Finland, where she helped foster a “ trusted partners” network forquantum collaboration.

Abstract
The strength and pace of growth of the global quantum economy will
depend on the strength of its foundation, not just in terms of technology
maturity but the infrastructure needed to measure, characterize andinterconnect both systems and components. Are there physical025

standards and measurement practices available to fact-check products
under development or deployed in the field? Do we have a common
language to bridge the gap between research and commerce? This talkwill discuss how the measurement and standards infrastructure is being
developed to accelerate the development and adoption of quantum
technologies.

026

PL-04-01

Introduction of the Australian Quantum
Association (AQA)
George Robinson
AQA

Biography
Chiel Financial Officer, Quantum Brilliance

Abstract027

PL-04-02

The Quantum Economic Development
Consortium (QED-C): Growing the quantum
industry
Celia Merzbacher
QED-C

Biography
Dr. Celia Merzbacher is the Executive Director of the Quantum Economic
Development Consortium (QED-C), a global consortium of nearly 250
stakeholders from industry, academia and government that aims to growthe quantum industry and associated supply chain. Dr. Merzbacher has
two decades of experience leading technology initiatives andpartnerships. Previously, she was Vice President for Innovative
Partnerships at the Semiconductor Research Corporation, a consortiumof the semiconductor industry. In 2003-2008, she was Assistant Director
for Technology R&D in the White House Office of Science and Technology
Policy where she led the multi-agency National Nanotechnology
Initiative. She also served as Executive Director of the President’s Councilof Advisors on Science and Technology (PCAST). Dr. Merzbacher is a
Fellow of the AAAS and serves on the Innovation Policy Forum of the
National Academy of Sciences, Engineering and Medicine (NASEM). Sheadvises the Krach Institute for Tech Diplomacy at Purdue University, as
well as advisory boards of several university centers and institutes. She ispast chair of the NASEM National Materials and Manufacturing Board andwas on the Board of Directors of the American National Standards
Institute. Dr. Merzbacher began her career as a research scientist at the
U.S. Naval Research Laboratory, where her research in optical materials
led to numerous scientific publications and six patents.

028

Abstract
The Quantum Economic Development Consortium (QED-C) is anindustry-driven consortium of stakeholders, managed by SRIInternational, that aims to enable and grow the quantum industry andsupply chain. The consortium was called for in the U.S. National
Quantum Initiative Act of 2018 and is supported by the National Instituteof Standards and Technology (NIST) and approximately 250 corporate,
academic and other members. Today, QED-C is open to members fromselect countries around the world and is building a trusted community ofinnovators from like-minded countries. Through the work of member
volunteers, QED-C seeks to identify and address gaps in enabling
technologies, standards and benchmarks, workforce and policies toaccelerate the development of quantum technologies for economic andsocietal benefit. With its global membership and in partnership withother quantum industry associations, QED-C is helping quantum
companies to expand their business and collaborations across borders
and to strengthen the quantum ecosystem in accordance withinternational norms.

029

PL-04-03

UK Quantum, the UK̕ s quantum industry tradebody
Tim Prior
UKQuantum

Biography
UKQuantum Steering Committee,
Quantum Programme Manager at the National Physical Laboratory

Abstract• UK Quantum, the UK’s quantum industry trade body
• The UK quantum strategy, how it has developed and where it is going• The UK National Physical laboratory activities to support the UK’s
quantum ecosystem.

030

PL-04-04

Introduction of Q-STAR -Create industries &businesses with quantum technologyTaro Shimada
Quantum STrategic industry Alliance for Revolution

Biography
Taro Shimada began his career in 1990, working on aircraft design at
ShinMaywa Industries Ltd.
In 1999 he joined Structural Dynamics Research Corporation, a part ofSiemens, which led to a series of progressively senior posts in Japan andat Siemens HQ in Germany.
After serving as Managing Executive Officer of Siemens K.K, he joined
Toshiba in October 2018 as Corporate Digital Business Chief Strategy
Officer, and in April 2019 became Chief Digital Officer, responsible forToshiba’s digital transformation and for strategic business creation andpromotion. He was appointed CEO & Representative Director of Toshiba
Data Corporation in February 2020, and President and CEO of Toshiba
Digital Solutions Corporation in April 2020. In March 2022, Mr. Shimada
was appointed to take the reins at Toshiba, as President & CEO.
Mr. Shimada’s diverse experience in hardware development includes
commercial aircraft; process consultation for industry; and product life
cycle management. An expert in factory automation and digitization, he
has advised many of Japan’s leading manufacturers. He is also an advisor
to the Robot Revolution & Industrial IoT Initiative and the IoT Acceleration
Lab, and has contributed to Industrie 4.0 in Germany and Connected
Industries in Japan.
Mr. Shimada has been a guest professor at Otemon Gakuin University inOsaka, Japan, since April 2020.
In September 2021, he was appointed Chair of the Executive committee
for the establishment of Q-STAR (Quantum STrategic industry Alliance for031

Revolution), a consortium to promote business creation throughquantum technology, and was appointed Chair of the board in May 2022.
Mr. Shimada relaxes by playing the drums, and enjoys all genres of music.

Abstract
The presentation will look at current trends in the practical application ofquantum technology, including in logistics, manufacturing, finance, andmedicine. It will also emphasize the accelerating industrialization of theIsing model, which many of Q-STAR’s member companies are developing.
To date, Q-STAR has discussed over 50 quantum-technology use casesand selected 16 of them to be followed up on as the next step and madetheir industry roadmap.
In addition, Q-STAR member companies, representatives of academia,
and national institutes outside the council, are discussing an open
software platform that is not dependent on the type of quantum
computer. The plan here is to visualize a hierarchy extending from
customer issues to the various calculation methods, and to build ahypothesis for practical use as a platform.
Beyond this, the presentation will also look at the current status ofinternational cooperation in establishing a global quantum market.

032

PL-04-05

Supporting collaboration between academia
and industry for quantum innovation
Akihisa Tomita
Quantum ICT Forum/Hokkaido University

Biography
Akihisa Tomita earned his Bachelor’s and Master’s degrees in Physics,
and his Ph.D. in Electronics from the University of Tokyo in 1982, 1984,
and 1998, respectively. From 1984 to 2000, he conducted research on
photonics, and from 1998 to 2010, he was involved in the development of
quantum information technology at NEC Corporation. From 2000 to 2010,he led the group for quantum information experiments in the Quantum
Computation and Information Project, ERATO and SORST, JST. In 2010,
he became a professor at the Faculty of Information Science andTechnology at Hokkaido University. He co-founded the Quantum ICT
Forum and has been serving as Representative Director since 2019. His
current research focuses on photonics for quantum information
processing and quantum communication.

Abstract
The Quantum ICT Forum aims to develop sustainable quantum
technologies that will advance both industry and society. Combining
academic research with practical industry experience will accelerate
progress toward globally competitive quantum technologies. The
collaboration seeks to achieve this goal by fostering a partnership
between academia and industry.

033

A bst r act s

TracksTracksPL

CP

Plenar y Sessions

Quantum Computing Track

Contents / Topics

Contents / Topics

Welcome from Organizing Committee and Hosts,
Plenary Talks, Keynote

Quantum Computing architecture, Quantum
computers with Atoms and Ions, Photonic Quantum
Computers, Fault Tolerant Quantum Computing,
Quantum Algorithms for Chemistry, NISQ
Algorithms, Young PIs Session, Superconducing
Quantum Computing, Quantum Annealing,
Verifiable Quantum Computing, Semiconductor
Quantum Computers, Quantum Simulations

TracksTracksSE

CC

Quantum Sensing Track

Quantum Cr yptography &Communication Track

Contents / Topics

Contents / Topics

Q-sensors for Life Science, NV Center and Applications
for Life Sciences, Solid-State Quantum Sensors, 5th
IFQMS Short Presentation Session for Young
Scientists, Solid-State Quantum Sensors, Q-sensors
for Life Science, NV Center and Applications for Life
Sciences, Atom Interferometer, Atom/Ion Clocks *29th
Nov Sessions are a joint-program with The 5th IFQMS(The 5th International Forum on Quantum Metrology
and Sensing).

Quantum Internet, Young Researcher Panel Session,
Quantum Cryptography034

CP-01-01

Nanofiber cavity quantum electrodynamics
systems for distributed quantum computing
Takao Aoki
Waseda University

Abstract
Distributed quantum computing, where many quantum processing units
containing small to moderate number of qubits are connected to form alarge-scale quantum network, is a promising approach to realize aquantum system with a large number of qubits required for fault-tolerant
universal quantum computing.
Cavity quantum electrodynamics (QED) systems, where atoms andphotons are confined and interacts within optical cavities, can be utilized
to construct a distributed quantum computer, if one could place many
atoms in a cavity while maintaining strong coupling between individual
atoms and the cavity, individually address the atoms, operate quantum
gates on selected atoms, and connect multiple cavity QED systems withlow losses. These tasks have been difficult to achieve with conventional
cavity QED systems based on free-space cavities. To overcome these
difficulties with the conventional systems, we have been developing
novel cavity QED systems based on optical nanofibers and neutral atoms.
In this talk, I will present our experimental research on nanofiber cavity
QED systems and prospects toward distributed quantum computing
based on these systems.

035

CP-01-02

Photonic quantum machine learning
Philip Walther
University of Vienna

Abstract
After a brief overview of quantum photonic technology, I will present the
recent demonstration of a deterministic time-reversal protocol for qubit
evolutions by exploiting so-called quantum-switches that superimpose
the order of quantum operations. Then I will show experimental resultsof reinforcement learning using a tunable photonic nanoprocessor, where
the learning of the machine is enhanced with respect to classicalarchitectures. In addition, I will discuss our development of a so-called
quantum memristor for single photons. Such devices, which are capableof mimicking the behavior of neurons and synapses, are promising forquantum neural networks.

036

CP-01-03

Quantum science with tweezer arrays
Manuel Endres
CaltechAbstract
I will give an update on experiments in our group on quantum
computing/simulation with Rydberg arrays based on two valence
electron atoms. The rich level structure of such atoms enables novel
cooling, control, and read-out schemes. First, I will show our latest
results on creating Bell states with ~0.9985 fidelity and associated error
budget. Second, I will give an overview on benchmarking a 60-atom
quantum simulation in terms of the fidelity for reaching maximum
entanglement entropy states. I will also show new results for quantifying
the amount of mixed state entanglement in this system. If time permits, I
will show results on novel cooling, control and entanglement of motional
states in tweezers.

037

CP-02-01

Electron and hole spin qubits in silicon
Leon C. Camenzind
QFSRG, CEMS RIKEN

Abstract
Silicon-based spin qubits offer promise for large-scale quantum
processing, thanks to their compatibility with industrial nanofabrication,
small size, fast processing, and long coherence times.
The Quantum Function System Research Group (QFSRG) at RIKEN
achieved impressive results with electron spin qubits in isotopicallypurified silicon-28 quantum wells. We surpassed the fault-tolerant
threshold of 99% fidelity for critical operations, implemented quantum
error correction, and introduced a novel shuttling-based quantum link.
In a collaboration between the University of Basel and IBM Research, wedemonstrated that fin field-effect transistors (finFET) in natural silicon
can host hole spin qubits. These qubits operate above 4 Kelvin, atemperature at which there is an improved potential for scalability using
integrated quantum circuit solutions. Furthermore, we demonstrated
fast electrical control, high fidelity single-qubit gate operations, andachieved two-qubit gates with anisotropic exchange interaction.
The results of these two projects mark significant steps towards scalable
electron and hole spin qubits in silicon. Recognizing the need for millionsof qubits for fault-tolerant quantum computing, the semiconductor
industry is increasingly investing in spin qubits. By leveraging existing
semiconductor fabrication techniques for mass production, thescalability of spin-based quantum computing is becoming more feasible,
capitalizing on the inherent advantages of spin qubits.
038

CP-02-02

Semiconductor integration technology forrealization of silicon quantum computers
Noriyuki Lee
Hitachi, Ltd.

Abstract
The scalability and long coherence time of silicon quantum dot-based
qubits make them promising candidates for large-scale quantum
computing. We are developing two-dimensional Si spin-qubit arrays andoperating circuits utilizing silicon integrated circuit technologies. In the“Initialization”, “Operation”, and “Readout” schemes required forquantum computing, the technology developed in consideration of largescale integration and operability by taking advantage of thecharacteristics of silicon is demonstrated. We will discuss our efforts torealize large-scale quantum computers including hardware and software.

039

CP-02-03

Recent progress on graphene quantum dot
devices
Takuya Iwasaki
National Institute for Materials Science

Abstract
Graphene is a promising host material to implement the solid-state spin
qubits due to its extremely small spin-orbit and hyperfine interactions.
Moreover, the valley degree of freedom in graphene offers the possibility
to encode quantum information with novel principles. Althoughgraphene does not have a band gap, graphene quantum dot devices canbe realized with confinement potential defined by patterning graphene
into a nanostructure or by applying a perpendicular electric field tobilayer graphene. Thanks to the development of transfer technology for
two-dimensional materials, gate-defined bilayer graphene quantum dot
devices have been recently established for investigating the spin andvalley quantum states. Furthermore, van der Waals heterostructures
also have the potential to modulate various physical properties ofgraphene through the proximity effect and moiré superlattice. In thistalk, we will present the method to realize high-quality graphene devices,and single-electron transport properties in double quantum dot devices
based on the bilayer graphene/hexagonal boron nitride moiré
superlattice.

040

CP-03-03

Beyond-classical quantum computing withsuperconducting circuits
Yu Chen
Google Quantum AI

Abstract
Quantum computers have the potential to solve problems that are
intractable for classical computers. However, achieving such beyondclassical performance has been an outstanding challenge, requiring thedevelopment of quantum algorithms and capable hardware systems. I
will give an overview on the research in the Google Quantum AI team inthis area. I will discuss the technical advancements in our quantum
hardware, which enabled the recent beyond-classical random circuit
sampling result and its underlying physical mechanisms. I will conclude
the talk by discussing the challenges and promises associated withmeasuring physical local observable in the beyond-classical regime.

041

CP-03-04

Niobium-nitride-based superconducting qubit
Sunmi Kim
National Institute of Information and Communications Technology (NICT)

Abstract
We present an investigation focused on advancing superconducting
qubits by using niobium-nitride (NbN)-based qubit. In conventional
superconducting qubits utilizing aluminum-based Josephson junctions(JJs), the decoherence from microscopic two-level systems in amorphousaluminum oxide is concerned. As alternative materials for the JJs of thequbits, we introduce fully epitaxial nitride JJs consisting of NbN/AlN/NbN
tri-layer. The all-nitride qubits offer several advantages, such as thepotential for epitaxial tunnel barriers, resulting in reduced two-level
fluctuators, and a larger superconducting gap of approximately 5.2 meVfor NbN, compared to ~0.3 meV for aluminum, which suppresses theexcitation of quasiparticles.
To investigate qubit properties, we have fabricated a capacitivelyshunted flux qubit coupled to a half-wavelength coplanar waveguideresonator. By employing a Si substrate with TiN buffer layer instead of
the conventional MgO substrate for the epitaxial growth of the NbN film,
our nitride qubit has demonstrated a significant improvement incoherence times, such as T1 = 16.3 µs and T2 = 21.5 µs [1], which are morethan an order of magnitude longer than those reported in the literatureusing MgO substrates [2]. These results represent a significant step
towards constructing a new platform for superconducting quantum
hardware.
[1] S. Kim et al., Communications Materials 2, 98 (2021).
[2] Y. Nakamura et al., Appl. Phys. Lett. 99, 212502 (2011).
042

CP-04-02

Quantum CAE: automation in science withquantum computing and machine learning
Tadashi Kadowaki
AIST / DENSO

Abstract
Scientific discoveries progress through experimentation, dataprocessing, and the formation of new hypotheses. Recently,
advancements in computer capabilities and algorithmic enhancements
have enabled the partial automation of this process, a trend particularly
noticeable in Computer-Aided Engineering (CAE) within the industrial
sector. In CAE, simulations are utilized to extract product characteristics(observable values) from blueprints (hypotheses), subsequently refining
the blueprints based on these characteristics. From a machine learningperspective, this equates to input and output data. As more data
becomes available, it becomes feasible to construct a surrogate modelthat represents this relationship. Solving the inverse problem of thismodel provides the desired blueprints (hypotheses). Optimization
techniques play a crucial role in solving the inverse problem, indicatingthat product design with CAE is a cyclical process involving simulations,
machine learning, and optimization. Studies have demonstrated thatthese computational tasks are well-aligned with the strengths ofquantum computers, and it is anticipated that they will substantiallyreduce the lead time for producing product blueprints. Quantum CAE,
defined as performing these tasks on a quantum computer, not only
accelerates the process but also aids in automating science, reflecting
the cycle of scientific discovery and promoting a more efficient andinnovative approach.

043

CP-04-03

Quantum inspired computing: technology &strategy and applications
Taisuke Iwai
Strategic Alliance Unit, Fujitsu Limited

Abstract
Q-STAR (Quantum STrategic industry Alliance for Revolution) is generalincorporated association to create quantum-related industries andbusinesses. Quantum computing is one of scope in Q-STAR. Quantum
gate computing is definitely a candidate of future computing, but, fromthe industrial point of view, it will take more than several years to realize
a mature quantum gate computer implemented into the society.
Alternatively, quantum inspired computing is a mature computing andrecently has been garnering attention.
In this talk, I will give a brief introduction of Q-STAR and quantum
inspired computing which is used in the subcommittee on combinatorial
optimization problem to create quantum-related use-cases. I will also
give use-cases by utilizing quantum inspired computing. Following that I
will discuss about future computing candidates next decade.

044

CP-05-01

Perspectives on the current state of quantum
computing systems capability
Hanhee Paik
IBM Quantum

Abstract
I would like to share IBMʼs perspective on the current state of quantum
computing capabilities and the future direction of quantum computing.
As individual metrics, we can now observe two qubit gate fidelities areapproaching 99.9% and quantum systems can process circuits at the
speed of 15,000 CLOPS(1). With improved quantum computing
performance metrics, IBM can provide nearly 20 quantum computing
systems being on service 24/7 with more than 95% uptime. In thisenvironment, we can start pursuing the utility of quantum computing totackle non-trivial problems that can be challenging for classicalcomputing. I will summarize the recent advancement of quantum
computing utility with quantum circuits of ~ 100 qubits by depth ~ 50with ~ 1000 gates and how IBM envisions quantum computing should
evolve-to a quantum-centric supercomputing.
(1) A. Wack et al. https://arxiv.org/abs/2110.14108

045

CP-05-02

Beyond classical machine learning: new
insights on quantum machine learning
Sofiene Jerbi
Freie Universität Berlin

Abstract
Quantum machine learning (QML) is a rapidly evolving field, driven by its
prospects to bring quantum enhancements in many practicalapplications. Yet, several open questions are in the way of achieving thisgoal: Do there exist learning tasks, even artificially constructed, where
QML can achieve a provable quantum advantage? If so, can we still retain
this quantum advantage in quantumly trained but classically evaluated
QML models? Among proposed models in the literature, are there
preferred models we should use in QML? In this talk, I will present someof the recent insights we have gathered in an attempt to answer thesequestions.

046

CP-05-03

Generalized quantum subspace expansion for
quantum error mitigation
Suguru Endo
NTT computer and data science laboratories

Abstract
One of the major challenges for erroneous quantum computers isundoubtedly the control over the effect of noise. Considering the rapid
growth of available quantum resources that are not fully fault tolerant, itis crucial to develop practical hardware-friendly quantum error
mitigation (QEM) techniques to suppress unwanted errors. Here, we
propose a novel generalized quantum subspace expansion method
which can handle stochastic, coherent, and algorithmic errors inquantum computers. By fully exploiting the substantially extended
subspace, we can efficiently mitigate the noise present in the spectra of agiven Hamiltonian, without relying on any information of noise. The
performance of our method is discussed under two highly practicalsetups: the quantum subspaces are mainly spanned by powers of thenoisy state and a set of error-boosted states, respectively. We also
propose the resource-efficient implementation of generalized quantum
subspace expansion by using the dual-state purification method, andshow that it can even allow for the simulation of the twice the system sizewith the moderate sampling overhead.

047

CP-05-04

Quantum chemistry on NISQ devices beyond
variational quantum algorithms
Keita Kanno
QunaSys

Abstract
Quantum chemistry has been one of the most promising applications ofquantum computing, motivated by the natural correspondence between
the quantum states on quantum computers and the electronic states inchemical systems. The quantum phase estimation algorithm enables one
to exploit this correspondence to calculate ground- and excited-stateenergies of complex molecules accurately and efficiently, but its
demanding gate complexity requires fault-tolerance for a successful
execution. Variational quantum algorithms such as the variational
quantum eigensolver (VQE) has been proposed to exploit noisy, nonfault-tolerant quantum computers by using them repeatedly in
combination with classical computers, but they have problems such as
the large number of quantum circuit executions for optimization and forsuppressing the sampling error, in addition to its insufficient noise
resilience. Developing a noise-resilient algorithm with a practical runtime
is a fundamental challenge to take advantage of noisy quantum
computers in quantum chemistry.
In this talk, as a potential solution to this challenge, I will introduce theQuantum-Selected Configuration Interaction (QSCI) algorithm. QSCI uses
more of classical computing than a simple VQE, thereby resulting in amore accurate and reliable result. I will also touch on the subsequentstudies and future directions that further develops QSCI.

048

CP-06-01

Low-cost quantum error correction using
looped pipelines
Zhenyu Cai
University of Oxford

Abstract
Noise in quantum computers is the single biggest obstacle in theirpractical realisation, which needs to be tackled using quantum error
correction (QEC). However, even the leading QEC code - surface codes- faces many practical challenges like large spatial overhead for storing
quantum information and large space-time overhead for logical gates. In
order to achieve large-scale fault-tolerant quantum computation, we
explore a concept called ʻlooped pipelinesʼ which permits one to obtainmany of the advantages of a 3D lattice while operating a strictly 2D
device. The concept leverages qubit shuttling, a well-established featurein platforms like semiconductor spin qubits and trapped-ion qubits. The
looped pipeline architecture has similar hardware requirements to othershuttling approaches, but can process a stack of surface codes instead ofjust one, allowing for higher qubit density and much more efficient
logical gates. We find that this can achieve a cost saving of up to a factorof ~ 80 in the space-time overhead for magic state distillation (and afactor of ~ 200 with modest additional hardware). Using numericalmodelling and experimentally-motivated noise models we verify that thelooped pipeline approach provides these benefits without significant
reduction in the codeʼs threshold. In addition, we can also use looped
pipeline to remove almost all the space-time costs in implementing
virtual distillation, which is one of the leading quantum error mitigation
schemes.

049

CP-06-02

How many qubits do you need, really?
Mathias Soeken
Microsoft

Abstract
While quantum computers promise to solve some of the scientifically andcommercially valuable problems intractable for classical machines,delivering on this promise will require a large-scale quantum machine
integrated with the cloud. Determining how to best navigate thearchitecture design choices of a large-scale quantum computer that
efficiently caters to the performance and quality requirements ofpractical applications is an open challenge. To this end, we havedeveloped Azure Quantum Resource Estimation, a tool which uses
detailed models of the quantum stack to provide resource estimates(such as qubit counts and runtimes) for large-scale algorithms.
Understanding the number of qubits required for a quantum program
and the differences between qubit technologies allows innovators to
prepare and refine their quantum programs to run on future scaled
quantum machines and ultimately accelerate their quantum impact. In
the talk, we will illustrate the framework that we apply to perform
resource estimation and demonstrate how the tool helps to analyze
resource requirements for scalable quantum algorithms. Youʼll leave
ready to find out just how many qubits youʼll need, really.

050

CP-06-03

Partially fault-tolerant quantum computing
architecture with error-corrected Clifford gatesand space-time efficient analog rotations
Yutaro Akahoshi
Fujitsu Limited

Abstract
Quantum computers have the potential to revolutionize somecomputational tasks by significantly enhancing their calculation speed
compared to classical computers.
Although quantum computing devices have been rapidly developed inrecent years, there is still a large gap between today’s noisy
intermediate-scale quantum (NISQ) computing and fully fault-tolerant
quantum computing (FTQC) based on quantum error correction (QEC)
codes due to the very large requirements of physical qubits for the latter.
In this study, we propose a quantum computing architecture that bridges
the gap between NISQ and FTQC.
This architecture realizes universal computation by noisy analog rotation
gates and error-corrected Clifford gates.
Direct analog rotation is performed with small qubit requirements andresidual errors are minimized by a carefully designed state injection
protocol.
Our estimation based on numerical simulations shows that, for earlyFTQC devices consisting of 10^4 physical qubits with physical error
probability p = 10^{-4}, we can perform roughly 1.72 * 10^7 Clifford
operations and 3.75 * 10^4 analog rotations on 64 logical qubits.
Such computations cannot be achieved with existing NISQ and FTQC
architectures on the same device, as well as classical computers.
This talk is based on a recent paper by the authors (arXiv:2303.13181).

051

CP-07-01

Do quantum computers have applications inmachine learning and combinatorial
optimization?
Jens Eisert
Freie Universität Berlin

Abstract
There has been substantial excitement recently in identifying tasks forwhich quantum devices could possibly outperform classical devices.
Recent experimental implementations on random circuit sampling haveprovided strong evidence that near-term quantum devices canoutperform classical computers on paradigmatic tasks [1]. Thesedevelopments invite further studies to see what applications of quantum
devices could be found.
Notions of quantum-assisted machine learning are seen as candidates forthis. We will have a careful look at such notions. We will discuss thecomparative power of classical and quantum learners for generativemodelling within the PAC framework, for which we prove a separation [2,3]. Going further, will discuss how much structure is actually expected tobe required for quantum advantages in machine learning [4]. We provethat the injection of a single T-gate into Clifford circuits renders the taskof learning evaluators from samples infeasible in polynomial time. This isin stark contrast to the case of Clifford circuits for which we provide an
efficient learning algorithm [5].
Finally, we will have a look at the sense in which quantum computers
may assist in solving problems of combinatorial optimization. These
problems are usually NP-hard in worst case complexity, so it is far from052

clear what type of quantum advantage one can even hope for, despite
commonly made claims of expectations of such advantages in theliterature. We discuss a proven super-exponential quantum advantage
for combinatorial optimization [6].
At the end of the talk, we will put these findings into perspective anddiscuss the potential for near-term quantum computing, including
limitations of quantum error mitigation in NISQ devices [7], noise being
helpful in variational quantum algorithms [8], classical surrogates
simulating variational quantum algorithms in execution but not in
training [9, 10] and the exploitation of symmetry [10, 11].
[1] Rev. Mod. Phys. 95, 035001 (2023).
[2] Quantum 5, 417 (2021).
[3] Phys. Rev. A 107, 042416 (2023).
[4] arXiv:2110.05517 (2021).
[5] Phys. Rev. Lett. 130, 240602 (2023).
[6] arXiv:2212.08678 (2022).
[7] arXiv:2210.11505 (2022).
[8] arXiv:2210.06723 (2022).
[9] Phys. Rev. Lett. 131, 100803 (2023).
[10] arXiv:2309.11647 (2023).
[11] PRX Quantum 4, 010328 (2023).

053

CP-07-02

Verifiable quantum advantage without structure
Takashi Yamakawa
NTT Social Informatics Laboratories

Abstract
We show the following hold, unconditionally unless otherwise stated,
relative to a random oracle with probability 1:- There are NP search problems solvable by BQP machines but not BPP
machines.
- There exist functions that are one-way, and even collision resistant,against classical adversaries but are easily inverted quantumly. Similar
separations hold for digital signatures and CPA-secure public key
encryption (the latter requiring the assumption of a classically CPAsecure encryption scheme). Interestingly, the separation does notnecessarily extend to the case of other cryptographic objects such as
PRGs.
- There are unconditional publicly verifiable proofs of quantumness withthe minimal rounds of interaction: for uniform adversaries, the proofs are
non-interactive, whereas for non-uniform adversaries the proofs are two
message public coin.
- Our results do not appear to contradict the Aaronson-Ambanis
conjecture. Assuming this conjecture, there exist publicly verifiablecertifiable randomness, again with the minimal rounds of interaction.
By replacing the random oracle with a concrete cryptographic hashfunction such as SHA2, we obtain plausible Minicrypt instantiations of
the above results. Previous analogous results all required substantial
structure, either in terms of highly structured oracles and/or algebraic
assumptions in Cryptomania and beyond.

054

CP-07-03

Theoretical foundations of quantum advantage
in quantum algorithms
François Le Gall
Nagoya University

Abstract
In this talk I will describe recent developments on establishingtheoretical foundations of quantum advantage in quantum algorithms. I
will start with some well-known quantum algorithms and discuss theirpotential applications. I will then present recent results that establish thetheoretical foundations of quantum advantage for these algorithms, aswell as recent works that successfully “dequantize” them in some special
cases. I will conclude by mentioning challenges and open problems.

055

CP-08-01

Usecases by quantum technologies for social
contribution
Yuichi Nakamura
NEC Corp.

Abstract
One of targets of Q-star is to develop new industries by using quantum
technologies. We think image of social contribution to develop newquantum industries are the most important issue.
Then, each Q-star subgroup is looking for use cases for social
contribution. The subgroup of applications of quantum superposition is a
discussion group of applications of computer with quantum
superposition. We think quantum superposition has advantages in hugesearch area, simulation of elementary particles, and randomness.
Currently, our subgroup is discussing use cases in total solution of social
contribution or solution. In my talk, I presented our proposed solution
level use cases by using quantum superposition.

056

A bst r act s

TracksTracksPL

CP

Plenar y Sessions

Quantum Computing Track

Contents / Topics

Contents / Topics

Welcome from Organizing Committee and Hosts,
Plenary Talks, Keynote

Quantum Computing architecture, Quantum
computers with Atoms and Ions, Photonic Quantum
Computers, Fault Tolerant Quantum Computing,
Quantum Algorithms for Chemistry, NISQ
Algorithms, Young PIs Session, Superconducing
Quantum Computing, Quantum Annealing,
Verifiable Quantum Computing, Semiconductor
Quantum Computers, Quantum Simulations

TracksTracksSE

CC

Quantum Sensing Track

Quantum Cr yptography &Communication Track

Contents / Topics

Contents / Topics

Q-sensors for Life Science, NV Center and Applications
for Life Sciences, Solid-State Quantum Sensors, 5th
IFQMS Short Presentation Session for Young
Scientists, Solid-State Quantum Sensors, Q-sensors
for Life Science, NV Center and Applications for Life
Sciences, Atom Interferometer, Atom/Ion Clocks *29th
Nov Sessions are a joint-program with The 5th IFQMS(The 5th International Forum on Quantum Metrology
and Sensing).

Quantum Internet, Young Researcher Panel Session,
Quantum Cryptography057

SE-01-01

Quantum sensing: the promise, the challenge,
and the path ahead
Danielle Ann Braje
Massachusetts Institute of Technology Lincoln Laboratory

Abstract
With the promise of improved accuracy, stability, sensitivity, and smallersize, quantum sensors have the potential for significant advantages overtraditional technologies. Achieving these ends requires overcoming nontrivial challenges including maintaining the delicate quantum state,
operating in realistic noise environments, and developing practical,
extensible technologies.
I will give an overview of our quantum technologies, highlighting
quantum sensing with solid state systems. Spin defects in solids, such as
the nitrogen-vacancy color center in diamond, can be initialized into purequantum states, can be coherently controlled, and can have relatively
long-lived quantum coherence at room temperature. The
semiconductor-like platform has advantages through manufacturability
and the intrinsic vector nature of the sensors. Bringing devices to fruition
requires outperforming established technologies. Despite comparable
theoretical sensitivity limits to atomic and superconducting systems, theperformance of solid-state quantum sensors to date has lagged behindthese more mature alternatives.
We combine tailored diamond growth and quantum control together
with classical engineering to create fieldable magnetometers, which
outperform competitive technologies.

058

SE-01-02

Diamond-based magnetometer with dc
sensitivity below 10 pT Hz^-1/2 formagnetoencephalography
Naota Sekiguchi
Tokyo Institute of Technology

Abstract
Diamond-based magnetometer using negatively charged nitrogenvacancy (NV) centers is one of favorable quantum sensors for biomedical
applications such as magnetoencephalography (MEG) due to its
robustness and good field sensitivity under an ambient condition.
However, MEG requires a minimum detectable field on the order ofpicotesla, which has not been realized with a diamond-basedmagnetometer.
We develop a sensitive diamond-based magnetometer with a dc
sensitivity below 10 pT/ √Hz toward MEG of a living rat. We found that thesensor is stable with the remarkable sensitivity for at least 200 minutes.
The minimum detectable magnetic field was found to be 0.3 pT for a few
thousand seconds of measurement. Therefore, our sensor is capable ofdetecting a repetitive biomagnetic field, for example, a stimulus-evoked
field, with a strength of the order of 1 pT by accumulating the signals.
This work was supported by the MEXT Quantum Leap Flagship Program(MEXT Q-LEAP) Grant No. JP- MXS0118067395 and JPMXS0118068379.

059

SE-01-03

Double/Triple resonance of electron spin indiamond: Quantum sensing and manipulation
Junko Ishi-Hayase
Keio University

Abstract
Nitrogen-vacancy (NV) centers in diamond have been attractive
candidates for implementing quantum sensors, since electron spin statesof NV centers can be coherently manipulated using microwave (MW) field
and optically initialized/readout with long coherence time at room
temperature. In this study, we demonstrate AC magnetic field and/or
temperature sensing based on electron spin double- or triple-resonanceof NV centers in diamond observed under the continuous application oflaser, MW and radio-frequency (RF) fields[1-5]. In addition, we show theanalysis of electron spin state observed under the strong MW/RF fields
using Floquet theory[6] and Lindblad master equation.
This work was done in collaboration with Dr. Matsuzaki (Chuo Univ.), Prof.
Tokuda (Kanazawa Univ.), Dr. Ikeda (RIKEN), Dr. Watanabe (AIST), Prof.
Mizuochi (Kyoto Univ.), Prof. Kobayashi, Dr. Sasaki (Univ. Tokyo), andHayase Laboratory members (Keio Univ.). This work was partly supported
by MEXT Q-LEAP (No. JPMXS0118067395), JSPS KAKENHI (No.
JP20H05661, JP21K13852, and JP22H01558), JST PRESTO (Grant Nos.
JPMJPR1919 and JPMJPR2112), JST Moonshot R&D (Grant No.
JPMJMS226C), Kanazawa University CHOZEN Project 2022, and Keio
University CSRN.
[1] S. Saijo, et al., Appl. Phys. Lett. 113, 082405 (2018). [2] T. Yamaguchi, etal., Jpn. J. Appl. Phys. 58, 100901 (2019). [3] K. J. Hallbäck, et al., Proc.
SPIE 117004A (2021). [4] H. Tabuchi, et al., J. Appl. Phys. 133, 024401(2023). [5] R. Okaniwa, et al., arXiv:2305.12141 (2023). [6] T. Mikawa, et al.,Phys. Rev. A 108, 012610 (2023).
060

SE-02-01

Basic properties and quantum control of
diamond qubitsÁdám Gali
HUN-REN Wigner Research Centre for Physics / Budapest University of Technology and Economics

Abstract
Room temperature solid state defect qubits are relatively rare. Spinlattice relaxation poses an ultimate limit to the coherence times of thequbits in the given material. Understanding the underlying
microscopic mechanisms is essential to discover qubits that can operate
under ambient conditions. We show for the exemplary diamond nitrogenvacancy (NV) center by means of first principles simulations that – incontrast to textbook cases – the electron-spin coupling is governed by
Raman scattering due to second-order spin-phonon interactions atelevated temperatures. The applicability of this finding to other defectspin systems will be discussed. Further addressing NV centers, a morethan four-fold improvement in sensitivity compared to that possible with
non-resonant illumination has been recently demonstrated at cryogenic
temperatures. In these experiments, nuclear spin relaxation underresonant excitation to polarize the 14N host was leveraged that can beimportant in low temperature magnetometer applications. We explain
the single- and double-quantum jumps in these experiments bytransverse hyperfine and quadrupolar couplings in the excited state.
Furthermore, we present recent results on inversion-symmetric defectqubits in diamond that could be important for quantum communicationand low-temperature quantum sensing applications.

061

SE-02-02

Plasma CVD engineering of diamond nitrogenvacancy centers for quantum sensing
Hiromitsu Kato
AIST

Abstract
Nitrogen vacancy (NV) centers in diamond have attracted attention as
quantum sensor due to their excellent spin properties such as longcoherence time and fast operation. There are several methods forforming NV centers, including introduction during crystal growth,electron beam irradiation, ion implantation, and their combinations. This
presentation will focus on plasma CVD engineering and will introduce
recent progress in the development of sensor materials and junction
devices. In terms of sensor materials, uniformity across the entire crystal
and suppression of crystal distortion are important perspectives, alongwith thicker films. CVD thick film growth, its NV spin property, andresulting sensitivity and current measurement demonstrations will be
described. For device applications, the MOS structure enabled control of
NV charge states by applying an external bias voltage. Furthermore, by
employing PIN junction device structure, electrical spin readout and NV
emission could be achieved. This is a major step toward an all-electric NV
control. Details and future prospective will be discussed including
technical aspects peculiar to plasma CVD engineering of diamond NV
centers. Acknowledgements: JPMXS0118067395, JPMJMS2062,
JPMI00316.

062

SE-02-03

Magnetic field imaging using quantum sensors
for condensed matter physics
Kensuke Kobayashi
The University of Tokyo

Abstract
Exploring the magnetic properties of various materials is one of thecentral topics in condensed matter physics. Diverse local magnetic field(magnetization) measurement methods have been developed.
Recently, there has been considerable interest in using nitrogen-vacancy
centers (NV centers) in diamonds as quantum magnetic sensors. As they
have unique electron spin-dependent optical excitation and relaxation
processes, the spin state of a single NV center can be optically read out
by combining microwaves. This technique is called optically detectedmagnetic resonance (ODMR). As the ODMR spectrum of an NV center in amagnetic field shows a Zeeman splitting, the magnetic field felt by theNV center can be measured by analyzing the spectrum. In 2020, it was
revealed that similar magnetic field measurements can be made usingboron vacancy defects in hexagonal boron nitride (hBN).
We aim to use these diamond and hBN quantum sensors to measure themagnetic properties of various materials locally. This talk will introduce
our recent achievements, such as real-space observation ofsuperconducting magnetic vortex, precise magnetic field measurement
aided by machine learning, and hBN quantum sensor nanoarray. These
will be fundamental techniques for future quantum sensor-based
precision physical property measurements.

063

SE-03-01

Mid-IR quantum sensing with entangled photons
Sven Ramelow
Humboldt-University Berlin

Abstract
A severe limitation for real-world adaptation of mid-IR sensing is thatbroadband mid-IR sources and detectors are often prohibitively
expensive, technically demanding and suffer from poor sensitivity andresolution. This has lead to different approaches of side-stepping theseby moving the detection wavelength to the visible regime, where one canenjoy the maturity of CCD and CMOS technology driven by the life
sciences, mobile phone and automotive industry. A convenient means for
this, also making sources in the mid-IR obsolete are nonlinear
interferometers based on entangled photons. They enable compact andcost-effective sensing in the mid-IR, for which I will present experimental
results on microscopy, spectroscopy and OCT and highlight theirpotential on real-world, industry-ready applications.

064

SE-03-02

Quantum enhancement towards sensitive
molecular vibrational imaging
Yasuyuki Ozeki
RCAST, The University of Tokyo

Abstract
Stimulated Raman scattering (SRS) microscopy is regarded as a sensitive
molecular-vibrational imaging method, opening up various biomedical
applications including label-free imaging, metabolic imaging, andsupermultiplex imaging. The quantum enhancement (QE) of SRS is
attracting attention for achieving sub-shot-noise sensitivity, while
previous QE-SRS suffered from low optical power, which limits thesensitivity. Here we present QE-SRS microscopy in high-power regimes(>30 mW) that are comparable to classical SRS microscopes. We
demonstrated QE-SRS imaging with 2.89 dB noise reduction comparedwith classical balanced detection SRS microscopy, paving the way forbreaking the sensitivity of classical SRS microscopes.

065

SE-03-03

Reaching the quantum limit with a gravitationalwave telescope
Kentaro Somiya
Tokyo Institute of Technology

Abstract
Gravitational waves are ripples in the spacetime. A massive astronomicaleven like a black hole merger can generate gravitational waves that are
observable by an interferometric detector on Earth. Gravitational-wave
detectors can measure a tiny displacement of a 10kg-scale test mass andits sensitivity is about to reach and exceed the standard quantum limit.
Our quantum limit comes from quantum fluctuation of light. Phasefluctuation of light makes shot noise and amplitude fluctuation of lightmakes radiation pressure noise. A number of proposals have been madeto reduce the quantum noise and the current telescopes implement the
optical squeeze injection technique. A recent study has revealed that thequantum noise level in LIGO detector with the squeezing technique has
already exceeded the standard quantum limit. In my talk, I will review thefundamental noise sources of a gravitational-wave telescope and thenmove on to the discussion about the quantum limit and the zero-point
fluctuation of the test mass.

066

SE-04-01

The state of quantum computing applicationsin health and medicine
Frederik F. Floether
QuantumBasel

Abstract
Medicine, including fields in healthcare and life sciences, has seen a flurryof quantum-related activities and experiments in the last few years(although biology and quantum theory have arguably been entangled
ever since Schrödinger’s cat). The initial focus was on biochemical andcomputational biology problems; recently, however, clinical and medical
quantum solutions have drawn increasing interest.
In this presentation, clinical and medical proof-of-concept quantum
computing applications are summarized. These consist of over 40
experimental and theoretical studies. The use case areas span genomics,
clinical research and discovery, diagnostics, and treatments andinterventions. Quantum machine learning (QML) in particular has rapidly
evolved and shown to be competitive with classical benchmarks in somestudies. Near-term QML algorithms have been trained with diverse
clinical and real-world data sets. This includes studies in generating newmolecular entities as drug candidates, diagnosing based on medical
image classification, predicting patient persistence, forecastingtreatment effectiveness, and tailoring radiotherapy. The presentation
covers how such advances help pave the way towards the long-termgoals of cell-centric therapeutics and precision medicine. An outlook on
medicine in the quantum era, including technical and ethical challenges,
is provided.

067

SE-04-02

Quantum computing in chemistry, molecularbiology, and materials science
Markus Reiher
ETH Zurich

Abstract
Many problems in molecular science and condensed-phase systems,
which are both governed by the dynamics of electrons and atomic nuclei,
demand an explicit quantum mechanical description. In such quantum
problems, the representation of wave functions grows exponentially withsystem size, which poses a severe restriction on traditional approaches.
However, such quantum problems should naturally benefit from digitalquantum simulation on a number of logical qubits, as this would scale
only linearly with system size. In recent years, we have considered
quantum computing applications in molecular biology, catalysis, andphysical chemistry in general, with a focus on how and where to establish
a quantum advantage in these areas (see list of references below). In mytalk, I will elaborate on the potential benefits of quantum computing inthese application areas, especially when compared to state-of-the-art
traditional approaches.
1) A. Baiardi, M. Christandl, M. Reiher, Quantum Computing for Molecular
Biology, ChemBioChem 24 (2023) e202300120
2) H. Liu, G. H. Low, D. S. Steiger, T. Haener, M. Reiher, M. Troyer, Prospects ofQuantum Computing for Molecular Sciences, Materials Theory (2022), 6, 11
3) V. von Burg, G. H. Low, T. Haener, D. S. Steiger, M. Reiher, M. Roetteler,
M. Troyer, Quantum computing enhanced computational catalysis, Phys.
Rev. Research (2021), 3, 033055
4) P. J. Ollitrault, A. Baiardi, M. Reiher, I. Tavernelli, Hardware Efficient
Quantum Algorithms for Vibrational Structure Calculations, Chem. Sci.
(2020), 11, 6842
5) M. Reiher, N. Wiebe, K. M. Svore, D. Wecker, M. Troyer, Elucidating
reaction mechanisms on quantum computers, PNAS (2017), 114, 7555.
6) J. Guenther, A. Baiardi, M. Reiher, M. Christandl, More quantum
chemistry with fewer qubits, (2023) arxiv:2308.16873
068

SE-04-03

Exploring the quantum acceleration of machinelearning in neural data analysis
Kei Majima
National Institutes for Quantum Science and Technology

Abstract
Recent advances in machine learning algorithms have enabled theextraction of inherent information in neural activities, the so-calledneural decoding technique, providing us with in-depth knowledge of
mechanisms of information processing in the brain. However, theirapplication to high-dimensional data is limited due to their sizeable
computational complexity. To tackle this problem, we have developed
scalable machine-learning algorithms using computational techniquesdeveloped in quantum computation. In this short presentation, we will
present recent results obtained with these quantum-inspired machinelearning algorithms and discuss future perspectives.

069

SE-04-04

Expansion of the scope of quantum annealing
Yuya Seki
Graduate School of Science and Technology, Keio University

Abstract
Developing calculators based on quantum mechanics is one of theattractive topics in quantum physics. Quantum annealing (QA), which can
prepare a desired quantum state by using quantum real-time dynamics,
is an important method on the calculators. A main application of QA is
combinatorial optimization problems such as job scheduling andcapacitated vehicle routing problem. To solve such problems by using
QA, we need to represent the problems with Ising model. However, notall problems can be represented by Ising model. A typical example isblack-box optimization problems. In the black-box optimization
problems, cost functions are not given analytically. Hence, we need toestimate the cost function from properties of a target black-box
optimization problem before optimizing it. Since the black-box
optimization problems frequently appears in applications of
optimization, expanding the range of application of QA to the black-box
optimization problems is an important work. In this presentation, we
start from a review of QA, and describe some applications of QA. Then,
we see that QA can be applied to black-box optimization problems byusing machine learning techniques. These techniques could pave the way
to expand the scope of applications of quantum technologies.

070

SE-04-05

Application of quantum annealing to quantum
sensing
Yuichiro Matsuzaki
Chuo University

Abstract
In biology, it is important to detect weak signals associated withbiological processes such as neural activity and chemical reactions.
Quantum sensing is a promising way to detect such signals, and so an
improvement of the sensitivity of quantum sensing plays a crucial role tounderstand the mechanism of life. Importantly, we can in principle use
entanglement to enhance the sensitivity of quantum sensors. However, it
is not straightforward to generate metrologically useful entanglement inrealistic systems. Here, we propose a way to generate an entanglement
between quantum sensors by using the principle of quantum annealing.
We drive the systems by external fields, and gradually change theamplitude and detuning. As long as there is an Ising-type interaction
between quantum sensors, we can prepare the so-called GHZ states,
which is one of the most useful states in quantum metrology. We discusspossible implementations of our scheme by using nitrogen vacancy
centers in diamond.

071

SE-05-01

Quantum cognition? The subatomic frontier ofbrain research
Matthew P. A. Fisher
University of California, Santa Barbara

Abstract
The endeavor to construct a laboratory quantum computer has evolved
into a multi-billion-dollar undertaking, marked by remarkable progress.
However, an intriguing question arises: could we ourselves be quantum
computers?
While maintaining quantum coherence on macroscopic time scales is
exceedingly unlikely in the warm wet brain, there is one exception:
Nuclear spins.
Our strategy is one of reverse engineering, seeking to pinpoint thebiochemical substrate and mechanisms that might underpin the
hypothetical quantum processing involving nuclear spins. Seemingly, a
specific neural qubit and a unique collection of ions, molecules andorganelles can be identified, illuminating an apparently single path
towards possible quantum processing in the brain. In this presentation, I
will provide an overview of our ongoing efforts to delve into thiscaptivating realm of exploration.

072

SE-05-03

Some steps towards enabling practicalquantum computing of biomolecules
Wataru Mizukami
Center for Quantum Information and Quantum Biology, Osaka University, Japan

Abstract
Quantum computers hold the promise of simulating biomolecules thatare currently beyond the reach of even the most advanced quantum
chemistry theories. In the last five years, thereʼs been a notable increasein studies using quantum computers for these calculations. While thefield has seen considerable advancements, weʼre still some way fromusing quantum computers for practical calculations. In this talk, Iʼll shedlight on our latest efforts to close this gap. Itʼs important to note thatquantum computers have specific strengths, and to unlock their fullpotential for quantum chemistry, better integration with classicalcomputers is essential. Weʼre working on this integration and havepioneered techniques such as quantum-selected configurationinteraction (QSCI) and computational basis sampling. Iʼll talk about
hybrid algorithms weʼve developed that combine the strengths ofquantum and classical computing.

073

SE-06-01

Can a rock be a wave? From 100 years of deBroglie̕ s wave-particle duality to quantum-gravity
Ron Folman
Atom Chip Group* / Ben-Gurion University of the Negev * https://tzin.bgu.ac.il/atomchip/

Abstract
It is almost exactly 100 years since De-Broglie made public his outrageous
hypothesis regarding Wave-Particle Duality (WPD), where the latter plays
a key role in interferometry. In parallel, the Stern-Gerlach (SG) effect,
found a century ago, has become a paradigm of quantum mechanics. I
will describe the realization of a half- [1-3] and full- [4-5] loop SG
interferometer for single atoms [6], and show how WPD, orcomplementarity, manifests itself. I will then use the acquired
understanding to show how this setup may be used to realize aninterferometer for macroscopic objects doped with a single spin [5],namely, to show that even rocks may reveal themselves as waves. I
emphasize decoherence channels which are unique to macroscopic
objects such as those relating to phonons [7,8] and rotation [9]. These
must be addressed in such a challenging experiment. The realization ofsuch an experiment could open the door to a new era of fundamental
probes, including the realization of previously inaccessible tests of thefoundations of quantum theory and the interface of quantum mechanics
and gravity, including the probing of exotic theories such as the DiosiPenrose gravitationally induced collapse. Time permitting, and as an
anecdote noting also De-Broglieʼs less popular assertion, namely, thatthe standard description of QM is lacking, I will also present our recent
work on Bohmian mechanics, which is an extension of De-Broglieʼs ideas
concerning the pilot wave [10]. Finally, I will also discuss technologicalapplications of some of the above works.
074

[1] Y. Margalit et al., A self-interfering clock as a “which path” witness,
Science 349, 1205 (2015).
[2] Zhifan Zhou et al., Quantum complementarity of clocks in the context
of general relativity, Classical and quantum gravity 35, 185003 (2018).
[3] Zhifan Zhou et al., An experimental test of the geodesic rule
proposition for the non-cyclic geometric phase, Science advances 6,
eaay8345 (2020).
[4] O. Amit et al., T3 Stern-Gerlach matter-wave interferometer, Phys. Rev.
Lett. 123, 083601 (2019).
[5] Y. Margalit et al., Realization of a complete Stern-Gerlachinterferometer: Towards a test of quantum gravity, Science advances 7,
eabg2879 (2021).
[6] M. Keil et al., Stern-Gerlach interferometry with the atom chip, Bookin honor of Otto Stern, Springer (2021).
[7] C. Henkel and R. Folman, Internal decoherence in nano-object
interferometry due to phonons, AVS Quantum Sci. 4, 025602 (2022) –invited paper for a special issue in honor of Roger Penrose.
[8] C. Henkel and R. Folman, Universal limit on quantum spatial
superpositions with massive objects due to phonons, https://arxiv.org/
abs/2305.15230 (2023).
[9] Y. Japha and R. Folman, Role of rotations in Stern-Gerlachinterferometry with massive objects, Phys. Rev. Lett. 130, 113602 (2023).
[10] G. Amit et al., Countering a fundamental law of attraction withquantum wave-packet engineering, Phys. Rev. Res. 5, 013150 (2023).

075

SE-06-02

Precise magnetometer with a Bose-Einsteincondensate
Kosuke Shibata
Gakushuin University

Abstract
State-of-the-art magnetometers offer magnetic field sensitivities down
to sub fT per root Hertz. A Bose-Einstein condensate (BEC) of neutral
atoms has realized an excellent magnetic field sensitivity of pT per root
Hertz with um spatial resolution. We aim to construct a quantumenhanced precise magnetometer with a BEC of rubidium-87 atoms. In
this talk, I will present our development of sensitive BEC magnetometer,
construction of squeezed light for improving the magnetometry, andmeasurement and cancellation of nonlinear ac Stark shift with the use ofmulti-state interferometer for measurement-based spin squeezing. This
work was supported by the MEXT Quantum Leap Flagship Program(MEXT Q-LEAP) Grant Number JPMXS0118070326.

076

SE-07-02

Laser spectroscopy of triply charged Th-229
toward a nuclear clock
Atsushi Yamaguchi
RIKEN

Abstract
The first-excited nuclear state of Thorium-229 (229mTh) can be excitedfrom the ground state by a vacuum ultraviolet laser. One of its
applications is a nuclear clock: an atomic clock based on the nuclear
transition between the ground state and 229mTh.
An ion trap is an optimal system for the nuclear clock because thequantum states of the 229Th ion in a trap can be precisely controlled bylaser cooling. We developed an ion trap system of triply charged 229Th(229Th3+). The 229Th recoil ions emitted from 233U were cooled bycollisions with a helium buffer gas and extracted as a low-energy ion
beam by an RF carpet. Since 2% of the recoiled 229Th ions from 233U is
229mTh, laser spectroscopy of trapped 229mTh3+ ions can be
performed. Such measurements provide detailed knowledge of thisunique nuclear state. In this presentation, we will present details on our
experiments of trapping and laser spectroscopy of 229Th3+.

077

A bst r act s

TracksTracksPL

CP

Plenar y Sessions

Quantum Computing Track

Contents / Topics

Contents / Topics

Welcome from Organizing Committee and Hosts,
Plenary Talks, Keynote

Quantum Computing architecture, Quantum
computers with Atoms and Ions, Photonic Quantum
Computers, Fault Tolerant Quantum Computing,
Quantum Algorithms for Chemistry, NISQ
Algorithms, Young PIs Session, Superconducing
Quantum Computing, Quantum Annealing,
Verifiable Quantum Computing, Semiconductor
Quantum Computers, Quantum Simulations

TracksTracksSE

CC

Quantum Sensing Track

Quantum Cr yptography &Communication Track

Contents / Topics

Contents / Topics

Q-sensors for Life Science, NV Center and Applications
for Life Sciences, Solid-State Quantum Sensors, 5th
IFQMS Short Presentation Session for Young
Scientists, Solid-State Quantum Sensors, Q-sensors
for Life Science, NV Center and Applications for Life
Sciences, Atom Interferometer, Atom/Ion Clocks *29th
Nov Sessions are a joint-program with The 5th IFQMS(The 5th International Forum on Quantum Metrology
and Sensing).

Quantum Internet, Young Researcher Panel Session,
Quantum Cryptography078

CC-01-01

Research and demonstration activities ofToshiba on QKD
Keisuke Mera
Corporate Research and Development Center, Toshiba Corporation

Abstract
Quantum key distribution (QKD) provides a means for exchanging
cryptographic keys securely. No matter how fast future computers may
become, it is vital that we have technologies that make it possible forcryptographic keys to be delivered without being eavesdropped on along
the way.
This talk presents the Quantum Key Distribution (QKD) service platform
based on Toshiba QKD technologies. We also introduce future researchand demonstrations of quantum communication technologies.

079

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Quantum key distribution research anddevelopment in NEC
Ken-ichiro Yoshino
NEC Corporation

Abstract
Quantum key distribution (QKD) can provide cryptographic keys that are
not leaked to the third-party using the principles of quantum mechanics
and is expected to be applied to many important mission-criticalsystems. NEC is engaged in various research and development toward
the commercialization of QKD. This presentation shows overview ofNEC’s QKD related activities including BB84 and continuous variable (CV)QKD systems. NEC and the partners also conduct field trials of QKD insome important application areas.

080

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Research on quantum-secured networking:
QKD for networks and networks for QKD
Chankyun Lee
KISTI

Abstract
Quantum-secured networking forms a layered architecture comprisingquantum, key management, and service layers. Quantum layer
distributes quantum keys by means of quantum key distribution (QKD)
protocol. Key management layer relays quantum keys to establish an
end-to-end key. Service layer utilizes the key to provide end-to-end
quantum-secured service.
The nature of quantum mechanics provides us with new opportunities toimprove networking system. As a research on the quantum layer in thequantum-secured networking, the first part of this talk will cover a
research on eavesdropping detection in classical fiber networks, bymeans of BB84 QKD protocol. An eavesdropper in the BB84 QKD protocolcannot avoid affecting quantum bit error rate, which provides us an
opportunity to detect the eavesdropper statistically with sufficiently highaccuracy.
For practical quantum-secured service, efficient utilization of a quantum
key resource is required, which is a limited and costly resource in thecurrent quantum technology. In the second part of this talk, I will delivera research on quantum key resource aware key relay algorithms for key
management layer in the quantum-secured networking. The key relay
algorithm can control the balance between max-min fairness andefficiency in the key relay.

081

CC-02-01

EuroQCI: A quantum communication
infrastructure for Europe̕ s digital decadePeter FATELNIG
Delegation of the European Union to Japan

Abstract
The EuroQCI will be a secure quantum communication infrastructure
spanning the entire European Union, including its overseas territories.
The European Commission works with all 27 EU Member States and theEuropean Space Agency to design, develop and deploy the EuroQCI. This
includes a terrestrial segment relying on fibre communications networks
linking strategic sites at national and cross-border level and a spacesegment based on satellites. This quantum communications
2
infrastructure will be an integral part of IRIS , the new EU space-based
secure communication system. The EuroQCI will safeguard sensitive dataand critical infrastructures by integrating quantum-based systems into
existing communication infrastructures, providing an additional security
layer based on quantum physics. It will reinforce the protection ofEuropeʼs governmental institutions, their data centres, hospitals, energy
grids, and more, becoming one of the main pillars of the EUʼs
Cybersecurity Strategy for the coming decades.

082

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Classic space optical communication
technology will realize satellite QKD
Tomohiro Araki
JAXA

Abstract
CLASSIC space optical communication technology must be needed torealize satellite QKD.
Outline, recent trends of space optical communication and itʼstandardization will be presented.

083

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Space laser communication and ourtechnologies
Kyohei Iwamoto
Sony Space Communications Corporation

Abstract
Sony Computer Science Laboratories (Sony CSL) has been develop laser
communication terminal jointly with NICT, University of Tokyo, NESTRA
and SKY Perfect JSAT Corporation under sponsored research from
Ministry of Internal Affairs and Communications and successfullylaunched on August 2nd, 2023 (JST) from wallops space launch site in
VA, USA.
This laser communication terminal is the second space terminal of SonyCSL which is followed by SOLISS space laser communication terminal
launch in 2019.
Sony CSL continues developing small laser communication terminals
utilizing commercial technologies from Sony to be ready for current
market requirements including productivity and reliability. In 2022, Sony
Corporation of America, one of subsidiary company of Sony Group
Corporation established Sony Space Communication Corporation in
California, USA to launch space laser communication business. In thispresentation, technologies inside our laser communication terminals,
some of space projects and expected business will be discussed.

084

CC-04-01

Quantum delegation with an off-the-shelf device
Anne Broadbent
University of Ottawa

Abstract
Given that reliable cloud quantum computers are becoming closer toreality, the concept of delegation of quantum computations and its
verifiability is of central interest. Many models have been proposed, eachwith specific strengths and weaknesses. Here, we put forth a new model
where the client trusts only its classical processing, makes nocomputational assumptions, and interacts with a quantum server in asingle round. In addition, during a set-up phase, the client specifies thesize n of the computation and receives an untrusted, off-the-shelf (OTS)
quantum device that is used to report the outcome of a single constantsized measurement from a predetermined logarithmic-sized input. In the
OTS model, we thus picture that a single quantum server does the bulk of
the computations, while the OTS device is used as an untrusted andgeneric verification device, all in a single round.
We show how to delegate polynomial-time quantum computations in the
OTS model. Scaling up the technique also yields an interactive proof
system for all of QMA, which, furthermore, we show can be accomplishedin statistical zero-knowledge. This yields the first relativistic (one-round),two-prover zero-knowledge proof system for QMA.
As a proof approach, we provide a new self-test for n-EPR pairs using only
constant-sized Pauli measurements, and show how it provides a new
avenue for the use of simulatable codes for local Hamiltonian verification.
Along the way, we also provide an enhanced version of a well-known
stability result due to Gowers and Hatami and show how it completes acommon argument used in self-testing.
Based on joint work with Arthur Mehta and Yuming Zhao
arxiv:2304.03448.
085

CC-04-02

Numerical method for security analysis ofquantum key distribution based oncomplementarity
Toshihiko Sasaki
The University of Tokyo

Abstract
The main goal of the security analysis in the quantum key distribution isto provide the security proof for general attacks in the finite-key regime.
In recent years, it is also important to consider imperfections of thedevices. It increases the number of parameters in the device models andmakes security analysis complicated. One possible way to deal with thissituation is to use numerical methods to provide the security analysis.
The question is how to make it adaptable to a wide range of situations
and how to achieve high key rate even in the finite-key regime. We will
present recent progress in a numerical method for the security proof
based on complementarity.

086

CC-04-03

Quantum key distribution network and quantum
internet toward next generation communication
infrastructure
Mikio Fujiwara
National Institute of Information and Communications Technology

Abstract
We are conducting research and development on quantum key
distribution (QKD) networks as well as quantum internet. Even with
optical fibers or satellite links, communication paths are subject tosignificant losses, therefore, the global quantum communication requires
the use of protocols that are tolerant of quantum bits losses and errors,
as well as the implementation of functions unique to quantum
technology. Regarding quantum Internet, we define the quantum
Internet as a communication network with remote transmission ofquantum states and high-precision synchronization. Our definition of thequantum Internet is a future communication infrastructure that cancoexist with trusted nodes based QKD networks would provide moresecure communication. Specifically, we aim to synchronize distant atom
clocks for high-precision synchronization and frequency stabilization oflight sources to achieve higher performance such as twin field (TF) QKD,
and to combine the keys obtained from Quantum Internet with secure
network coding techniques such as secret sharing schemes on QKD
networks based on trusted nodes. By combining such technologies, wewould like to realize more secure key and data transmission. This lecture
will explain the details.

087

CC-05-01

Building the quantum internet
Saikat Guha
University of Arizona

Abstract
Many organized efforts across the world are racing to realize the“Quantum Internet” - the internet of the future that is upgraded toprovide an additional service: that of reliably transmitting qubits
between distant users. Just like the internetʼs classical data
communications service, the quantum communications service must
reliably support many user groups, and support diverse and dynamic
applications - each with its unique requirements on the quality of service
for transmission of qubits, e.g., rate, latency, fidelity etc. Supporting
long-distance quantum communications at high rates and fidelities will
require scalable quantum repeaters and quantum-capable satellites forcontinental-scale quantum connectivity. In this talk, I will describe theunderlying theory of quantum networking and quantum repeaters,
allude to a few important applications, and give a glimpse of a large
effort underway as part of an NSF-funded 10-year engineering research
center called the Center for Quantum Networks (CQN). CQN is a highlyinterdisciplinary effort with research ranging material-science theory todesign high-coherence time quantum memories, quantum memory
design and fabrication, building efficient interfaces between matter andphoton qubits, cryogenic compatible packaging capabilities, quantum
error correction theory to design codes for quantum communication andentanglement distillation, repeater architecture design and analysis, theentire network protocol stack up to the application layer, and finally
network control, tomography and management protocols. I will also
describe how CQN engages disciplines such as law and policy, social andbehavioral sciences and economics through a research thrust focusing
on societal impacts of the quantum internet.
088

CC-05-02

Generation and manipulation of telecom
photons towards quantum internet
Yoshiaki Tsujimoto
National Institute of Information and Communications Technology

Abstract
By connecting distant quantum devices through entanglement, theentangled quantum devices act as a single huge quantum device. Thisfeature would be useful for realizing long-distance quantum key
distribution and quantum sensor/computer network. Such entanglement
networks are called quantum internet. As building blocks of quantum
internet, development of elemental technologies such as entangled
photon pair sources, quantum memories and quantum frequency
converters are of importance. Quantum ICT Laboratory in NICT has
developed entangle photon pair sources in telecom wavelength bandand quantum frequency converters. In the presentation, I talk about two
research topics. First, I talk about entangled photon pair sources attelecom wavelength. By using an electro-optic frequency comb and anonlinear crystal with waveguide structure, we have developed
entangled photon pair sources operating in GHz order clock rate. Second,
I talk about a quantum frequency converter which can be used to convert
the wavelength of single photons emitted from a quantum memory totelecom wavelength. We focus on the photons emitted from a Ca+ ion
trap, and successfully demonstrated the quantum frequency conversion.

089

CC-05-03

Prospects for quantum network using trappedion quantum nodes
Alto OsadaQIQB, Osaka University / KIS, The University of Tokyo

Abstract
Building a quantum computer using trapped ions inevitably involves
photonic interconnection of quantum nodes, which is equivalent toconstructing a trapped-ion quantum network. From quantum
networking and communication perspectives, trapped-ion quantum
node is a promising platform to implement various functionalities suchas quantum repeaters, quantum memory, and so on. We will present ourprospects for the implementation of quantum networking nodes using
trapped ions and discuss the realization of reproducible, plug-and-playtrapped-ion quantum nodes by fully utilizing the nanophotonics.

090

CC-06-01

Privacy for the paranoid ones - the ultimate
limits of secrecy
Artur Ekert
OIST / Oxford / CQT Singapore

Abstract
Among those who make a living from the science of secrecy, worry andparanoia are just signs of professionalism. Can we protect our secrets
against those who wield superior technological powers? Can we trust
those who provide us with tools for protection? Can we even trust
ourselves, our own freedom of choice? Recent developments in quantum
cryptography show that some of these questions can be addressed anddiscussed in precise and operational terms, suggesting that privacy is
indeed possible under surprisingly weak assumptions. I will provide an
overview of how quantum entanglement, after playing a significant rolein the development of the foundations of quantum mechanics, became anew physical resource for all those who seek the ultimate limits ofsecrecy.

091

CC-06-02

Inter-node quantum operations and assessmentof devices for such operations
Akihito Soeda
National Institute of Informatics

Abstract
Global operations between network nodes are crucial to achieve any
benefit of quantum computation. We have to design the individual
network components appropriately so that they function as a single large
quantum system when connected together. How to assess a single device
for its expected quantumness when used to form a large network? And
how to do so with as little experimental resources as possible? We
explore the case of remote CNOT gate utilizing one Bell state and discuss
how we can reduce the assessment complexity with respect to fullquantum process tomography.

092

CC-06-03

Characterization and optimization of quantum
repeater networks
David Elkouss
OIST

Abstract
Very recently we have seen the first proof of principle demonstrations ofentanglement-based quantum networks. However, many challenges
remain to scale these demonstrations. Here, I will discuss several ideas
for optimizing the performance of near-term networks. First, I will
introduce tools for efficiently evaluating the performance of quantum
networks and show how these tools can be leveraged for implementing
quantum key distribution over a very noisy chain of quantum repeaters.
Then, I will discuss some ideas for efficient entanglement
characterization as a byproduct of entanglement distillation.

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