112023

https://www.ntt-review.jp/archive/2023/202311.html

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Seiji Maruyama, President and Chief Executive Officer,
NTT QONOQ

Front-line Researchers
Hideki Yamamoto, Senior Distinguished Researcher,
NTT Basic Research Laboratories

Rising Researchers
Yusuke Ujitoko, Distinguished Researcher, NTT
Communication Science Laboratories

Feature Articles
Efforts to Speed Up Practical Application of Quantum
Computers
Toward Creation of a System Architecture for Quantum Computers
A Computing System for Supporting Application Development Using Ising Machines
Design and Development of Superconducting-quantum-computer System
Quantum Error Mitigation and Its Progress
Toward Early Fault-tolerant Quantum Computing

Global Standardization Activities
Trends in Security Standardization at ITU-T SG17

Information
Event Report: NTT Communication Science Laboratories Open House 2023

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Seiji Maruyama, President and Chief Executive Officer,
NTT QONOQ▼Abstract
NTT QONOQ was created by NTT DOCOMO, which focuses on communication
between people. NTT QONOQ aims to create new experiences that zigzag between
real and digital spaces with the hopes to enrich people’s minds and energize
society, going beyond distance, time, and imagination. We interviewed Seiji
Maruyama, president and chief executive officer of NTT QONOQ, who is working
toward creating a market for extended reality (XR), about the status of thecompany’s business and his mindset as a top executive.

Front-line Researchers

Hideki Yamamoto, Senior Distinguished Researcher,
NTT Basic Research Laboratories▼Abstract
A newly developed elemental source-sequencing technique has further advanced
NTT’s world-leading complex-oxide-thin-film growth technology, which allows forsynthesis of artificial materials consisting of alternating layers of different materials
with molecular-layer thicknesses, culminated in the discovery of a newsuperconductor. Synergetic integration of the thin-film growth technology andprocess informatics has enabled efficient preparation of the world’s highest-quality
thin films of oxides in existence, which has led to the observation of new physicalproperties in an oxide previously unsubstantiated. We interviewed Hideki
Yamamoto, a senior distinguished researcher at NTT Basic Research Laboratories,
who is conducting research on new materials synthesis and on their physicalproperties, about the above achievements, his thoughts on superconductors, which
are expected to be used in the environmental and energy-related fields, and hisattitude as a leader of a world-class research team.

Feature Articles
Efforts to Speed Up Practical Application of Quantum Computers

Toward Creation of a System Architecture for Quantum Computers▼Abstract

To achieve innovations in the era of theInnovative Optical and Wireless Network(IOWN), for example, predicting the future byDigital Twin Computing, a computing
infrastructure that supports ultra-high-speed
and ultra-large-scale computing is needed.
This need has led to a growing interest inquantum computers, which execute operations
in a completely different way than conventional
computers. NTT Computer and Data Science
Laboratories is engaged in both (i) theoreticalresearch to create system architectures thatmaximize the capabilities of quantum
computers and (ii) development of system andsoftware technology for practical applicationsof quantum computers.

Difficulty of implementation

November 2023 Vol. 21 No. 11

FTQC

General purpose(error tolerance/large scale)

NISQ computer

Specialized (error suppression/
small to medium scale)
Ising machine (specialized type)
Ising machine using
physical phenomena
Physical phenomenaSuperior to simulators in terms ofsimulation Ising
speed and diversity of solutions bymachineusing quantum mechanics andAn NISQ computer is expected to be applied
to computations that are noisy and difficult toscale but meaningful, even if the computation
size is not large (machine learning, chemicalsimulation, etc.).

behavior of light
A machine that simulates
physical phenomena byusing digital elements
Implemented with FPGAs andGPUs (leading in terms ofCompany D
feasibility)

Company F(FPGA/GPU)(superconducting
method)National projects

Company I/Company G(superconducting

National projects

Company I/Company G(superconductingmethod)

Large gaps (researchissues to focus on)

Company H method)(ion-trap method)

2050

ofYear tationemen

impl

2030
Quantum computer (specialized → general purpose)

0~202

Application-specific
FPGA: field-programmable gate array
GPU: graphics processing unit

General-purpose

Versatility