bluuebunny/crossref_metadata_2025 huggingface dataset:
Transmission of light-matter entanglement over a metropolitan network
Authors: Grandi Samuele , Rakonjac Jelena V. , Wengerowsky Sören , Lago-Rivera Dario , Appas Felicien , de Riedmatten Hugues
Published: September 2023

We report entanglement between a multimode quantum memory and a photon, after propagation in metropolitan fiber links. The detection setup is then placed in a remote location and detection signals are sent back through fibers.
The Role of Dispersion in Cavity-Enhanced Atomic Frequency Comb Quantum Memories
Authors: Taherizadegan Shahrzad , Kumar Sourabh , Davidson Jacob H. , Oblak Daniel , Simon Christoph
Published: September 2023

We develop a theoretical model for cavity-enhanced atomic frequency comb quantum memory and show how including the dispersion effect leads to better agreement of the reflectivity of the cavity and memory efficiency with the experiment.
Entangling Quantum Memories via Heralded Photonic Bell Measurement
Authors: Dhara Prajit , Englund Dirk R. , Guha Saikat
Published: September 2023

We evaluate the quality of entangled states generated on quantum network links based on entanglement swapping. Network non-idealities in conjunction with physi-cal memory decoherence models are incorporated to demonstrate encoding trade-offs and limitations for quantum networks.
Fieldable Combs For Next-generation Quantum Applications
Authors: Fassler Star , Timmers Henry , Smith Cole , Sodergren Bennett , Attar Andrew , Vogel Kurt , Knabe Kevin
Published: September 2023

Operation of miniaturized optical frequency combs throughout large temperature ranges and harsh vibration profiles will be presented, showing suitability for deployed applications such as optical clocks, time and frequency transfer, and dual comb spectroscopy.
Controllable and Scalable Quantum States in Fiber Loop Systems
Authors: Monika Monika , Nosrati Farzam , Fazili Riza , George Agnes , Muniz André Luiz Marques , Bisianov Arstan , Sciara Stefania , Chemnitz Mario , Franco Rosario Lo , Peschel Ulf , Morandotti Roberto
Published: September 2023

Quantum walks provide a platform for quantum measurements, simulations, and universal computations. Here we have experimentally demonstrated a potentially scalable, dynamically reconfigurable quantum walk processor using a temporal photonic lattice based on a coupled fiber loop system.
An agile radio-frequency source using internal linear sweeps of a direct digital synthesizer
Authors: Huegler Ethan , Meyer David H.
Published: September 2023

Agile rf sources are a fundamental component of control instrumentation in many quantum applications. We demonstrate how to program a common direct-digital-synthesizer to perform fast, sequential, linear sweeps with a time resolution of 8 ns.
Identifying Stable Zones for Propagation of Optical Solitons in Cubic-Quintic Nonlocal Nonlinear Media
Authors: Jana Soumendu , Sharma Mohit , Singh Brajraj , Mishra Manoj
Published: September 2023

This article focuses on achieving stability and identifying stability zones of laser beams in cubic-quintic nonlocal nonlinear media. Equilibrium points are examined and evaluated based on material characteristics and beam control parameters.
Quantum Super-resolution in Low-Earth-Orbit
Authors: Gosalia Ronakraj , Malaney Robert , Aguinaldo Ryan , Green Jonathan
Published: September 2023

Super-resolution involves resolving two incoherent sources beyond the Rayleigh limit. We show that a balanced homodyne detection apparatus in low-earth-orbit, despite quantum noise sources, can achieve sensitivity beyond this limit. Creative Commons CC BY license
An Ultranarrow Linewidth Laser for Deployable Quantum Sensors
Authors: Barnes Evan , Sodergren Bennett , Timmers Henry , Attar Andrew , Droste Stefan , Phillips Nate , Vogel Kurt , Knabe Kevin
Published: September 2023

A novel ultranarrow linewidth laser that can be operated outside the laboratory is presented. The 10-liter rackmount system has an integrated linewidth of <50 Hz and contains all necessary electronics and optics for deployed operation.
Adaptive Phase Estimation with Squeezed Vacuum States near the Quantum Limit
Authors: Rodriguez-Garcia Marco A. , Becerra Francisco E.
Published: September 2023

We present a protocol for homodyne adaptive optical phase estimation with squeezed vacuum states. The protocol utilizes the complete detection record of the homo-dyne, and approaches the quantum limit for a wide range of phases.
The Leggett–Garg inequality with a deformed Pegg–Barnett phase operator
Authors: Azuma Hiroo , Munro William J. , Nemoto Kae
Published: September 2023

We study the Leggett–Garg inequality for a boson system whose observable is given by deforming the Pegg–Barnett phase operator and show that the quantum Fourier transform is useful for the required measurement.
Phase Uncertainty Model for Realistic Quantum Multiphase Estimation
Authors: Teng Yi , Davis Samantha I. , Gurses Volkan , Vlimant Jean-Roch , Spiropulu Maria
Published: September 2023

We theoretically investigate quantum multi-phase estimation based on integrated quantum photonics. We design a quantum optical circuit, simulate the phase estimation protocol, and develop a generalized model to predict phase variance.
A Portable and Cost-effective Time-of-Flight System for Time-Domain Near-Infrared Spectroscopy
Authors: Hua Yuanyuan , Bantounos Konstantinos , Underwood Ian , Henderson Robert , Chitnis Danial
Published: September 2023

System complexity and the high price of Time-domain Near-Infrared Spectroscopy (TD-NIRS) hinder its clinical practice and daily care application. This paper presents a portable, cost-effective TD-NIRS system with high temporal resolution and efficient data acquisition.
Quantum tunneling and self-trapping of the Lee-Huang-Yang superfluid in double-well trap
Authors: Abdullaev Kh. , Galimzyanov R.M. , Shermaxmatov A.
Published: September 2023

We study the tunneling and self-trapping regimes of the Lee-Huang -Yang superfluid loaded in the double-well potential.
Breaking squeezed light optomechanical interferometer limit
Authors: Subhash Sreeshna , Davuluri Sankar
Published: September 2023

Hybridizing squeezed states technique with quantum back-action nullifying meter improves the force sensitivity of the optomechanical interferometer to
e−r
e
f
f
F
s
q
l
. Where r
eff
= r + 0.5 ln(4∆/ζ) with r as squeezing parameter, ζ as cavity decay rate and ∆ is the cavity detuning.
Photon counting statistics in nitrogen vacancy centres
Authors: Panadero Iván , Espinós Hilario , Tobalina Ander , Puebla Ricardo , Torrontegui Erik
Published: September 2023

We analyze the full counting statistics of photons emitted by a Nitrogen Vacancy center (NV) under non-resonant laser excitation and resonant micro-wave (MW) control. This the detected fluorescence. Furthermore, we can investigate the time correlations of the emitted photons and elaborate detection and polarization protocols to optimize the energy and time resources while maximizing the system sensitivity.
Towards Distribution of Memory-Compatible Polarization Entanglement Over Long Distances
Authors: Lodhen Tsering , Cottrill Dillion , Castillo-Veneros Leonardo , Martínez-Rincón Julián , Katramatos Dimitrios , Stankus Paul , Figueroa Eden
Published: September 2023

We have developed a portable, cavity-enhanced, telecommunication photon-pair source, which is coupled with polarization compensation enabling robust, high-fidelity entanglement. We have deployed this source on our three-node long-distance test-bed to distribute entanglement over 140km.
Study of spectral decorrelation in photon pair generation using thin film lithium niobate
Authors: Muskan Muskan , Pranav Chokkara , Lugani Jasleen
Published: September 2023

We demonstrate telecom-wavelength spectrally decorrelated photon pair generation using group index engineering in thin film lithium niobate. Simulations were performed to obtain a customized waveguide geometry to achieve high spectral purity of the photons.
Simulation of impacts of traps on the optical response of a butt-coupled InGaAs photodetector
Authors: Ding Qian , Schenk Andreas
Published: September 2023

We studied the impacts of hole traps on the optical response of a butt-coupled In0.53Ga0.47As photodetector. Traps at the In0.53Ga0.47As/SiO2 interface deteriorate quantum efficiency and the two highest cut-off frequencies. Traps at the In0.53Ga0.47As/Si interface improve the lowest cut-off frequency.
Nanometric-scale phase contrast imaging with undetected x-ray photons
Authors: Aknin Haim , Shwartz Sharon
Published: September 2023

We show that a system using down conversion of x-ray photons into optical photons together with the concept of quantum imaging with undetected photons can provide nanoscale resolution even for radiation sensitive samples.
Investigation of Inversion Interferometry for Quantum-Inspired Superresolution of Point Sources in Optical Microscopy
Authors: Pani S. , Khan S. , Liu S. , Lidke D. S. , Lidke K. A. , Becerra F. E.
Published: September 2023

We investigate the implementation of inversion interferometry for superresolving point sources in fluorescence microscopy. Our work focuses on the integration of this technique with microscopes used in superresolution microscopy for imaging broadband point and fluorophores commonly used to tag proteins in cells.
Chaining Weak Measurements: a Direct Approach to Joint Measurements of Position and Momentum
Authors: Bailey Thomas J. , Lundeen Jeff S.
Published: September 2023

We experimentally measure the joint value of position and momentum using two chained weak measurements, where the result of the first controls the strength of the second, enabling direct readout with a single pointer.
Reconfigurable Distributed Quantum Metrology with Continuous-Variable States
Authors: Ge Wenchao
Published: September 2023

Distributed quantum metrology can enhance measurements that are spatially distributed. However, a reconfigurable scheme for distributed phase sensing using continuous-variable states is missing. We propose such a scheme and discuss the fundamental sensing limits.
Practical Tests for Sub-Rayleigh Source Discrimination with Imperfect Demultiplexers
Authors: Schlichtholz Konrad , Linowski Tomasz , Walschaers Mattia , Treps Nicolas , Rudnicki Łukasz , Sorelli Giacomo
Published: September 2023

We show that quantum-optimal tests for discriminating between one and two light sources via spatial-mode demultiplexing become as good as flipping a coin in the presence of arbitrarily small imperfections, and we develop practical alternatives.
Towards Experimental Implementation of Adaptive Measurements for Efficient Qubit Phase Estimation
Authors: Pani S. , Rodriguez-Garcia M. A. , Castillo I. Perez , Barberis-Blostien P. , Becerra F. E.
Published: September 2023

We work towards the experimental implementation of an adaptive quantum measurement for single-qubit phase estimation that can theoretically achieve the quantum bound over the entire range of phases [0,2π].
Detection of Single Ions in a Nanoparticle Coupled to a Fiber Cavity
Authors: Beattie Eduardo , Deshmukh Chetan , Casabone Bernardo , Grandi Samuele , Serrano Diana , Ferrier Alban , Goldner Philippe , Hunger David , de Riedmatten Hugues
Published: September 2023

Using a fiber cavity, we show the first detection of single rare-earth ions in a nanoparticle. We report a maximum Purcell factor of 123, and an antibunching curve from a single spectral feature.
Large Single-Phonon Optomechanical Coupling Between III-V Quantum Dots and Surface-Acoustic-Wave Microcavities
Authors: DeCrescent Ryan A , Wang Zixuan , Imany Poolad , Nam Sae Woo , Mirin Richard P , Silverman Kevin L
Published: September 2023

We demonstrate large single-phonon optomechanical coupling rates, g0= 1.2 MHz, between InAs quantum dots and surface-acoustic-wave microcavity resonators. We show that these systems can be used for microwave-to-optical quantum transduction at mK temperatures.
Towards a Memory-Assisted Bell State Measurement Between Two Independent Entanglement Sources
Authors: Gera Sonali , Wallace Chase , Andrewski Shane , Figueroa Eden
Published: September 2023

We report on progress towards achieving entanglement swapping between independent cavity-enhanced entanglement sources that are tuned for quantum memory operation. Together with quantum memories, we envision the demonstration of a Type II quantum repeater.
Enhancing quantum network security with quantum dot single-photon sources
Authors: Vyvlecka Michal , Bozzio Mathieu , Jehle Lennart , Nawrath Cornelius , Cosacchi Michael , Giorgino Francesco , Seidelmann Tim , Loredo Juan C. , Portalupi Simone Luca , Axt Vollrath Martin , Michler Peter , Walther Philip
Published: September 2023

Quantum dots, additionally to their high brightness and single-photon purity, provide unique security benefits thanks to the tunability of coherence in the emitted photon-number states. We identify the optimal quantum-dot pumping schemes for quantum-cryptographic primitives.
Zero-Photon Subtraction
Authors: Pittman Todd B. , Nunn Cory M. , Shringarpure Saurabh U. , Franson James D.
Published: September 2023

Removing exactly zero photons from a quantum optical state can produce significant changes in its statistical properties. We review our recent experimental and theoretical results in this area, which have applications in quantum communications.
Experimental Certification of Quantum Transmission via Bell’s Theorem
Authors: Neves Simon , Martins Laura Dos Santos , Yacoub Verena , Lefebvre Pascal , Šupić Ivan , Markham Damian , Diamanti Eleni
Published: September 2023

We provide the first proof-of-principle experimental implementation of certified qubit transmission through an untrusted quantum channel, using one part of a maximally-entangled photon as a probe. The theoretical framework includes self-testing in a non-IID and semi device-independent setting, combined with new results on lossy quantum channels.
Decoherence-protected GHZ states of a nuclear spin ensemble surrounding a solid-state qubit
Authors: Wu Chun-Ju , Ruskuc Andrei , Choi Joonhee , Faraon Andrei
Published: September 2023

We prepare many-body Greenberger–Horne–Zeilinger states in a nuclear spin ensemble (51V in YVO4) via engineered interaction with a central spin (171Yb). Decoherence-free subspaces, protected from correlated noise, are investigated.
Nuclear Spins in the Proximity of Individual Erbium Dopants
Authors: Ulanowski Alexander , Merkel Benjamin , Gritsch Andreas , Früh Johannes , Salamon Fabian , Holzäpfel Adrian , Reiserer Andreas
Published: September 2023

Erbium dopants in optical resonators are a promising platform for spin-photon interfaces at telecommunication wavelengths. Frequency-selective optical pulses enable control over individual dopants and proximal nuclear spins.
Towards a Continuous Variable Quantum Compiler
Authors: Feldman Matthew , Volkoff Tyler , Holmes Zoe , Hong Seongjin , Marvinney Claire , Pooser Raphael , Sornborger Andrew , Marino Alberto M.
Published: September 2023

We present initial work towards an experimental implementation of a nonuniversal continuous variable quantum compiler capable of learning a linear phase operation with increased precision when quantum resources are used.
Error mitigation protocol for multi-photon noise in quantum repeater chains
Authors: Chahine Yousef K. , Nemitz Ian R. , Lekki John D.
Published: September 2023

Noise from multi-photon emissions can severely limit the use of probabilistic photon sources in quantum repeater chains. We present a Bell state measurement protocol that suppresses noise from multi-pair emissions in quantum repeaters.
Correlated Photon Pairs Obtained by SPDC in AlGaAs-OI Waveguides
Authors: Ulsig Emil Z. , Stanton Eric J. , Reddy Dileep V. , Shalm Krister , Volet Nicolas , Mirin Richard
Published: September 2023

A bright source of spontaneous parametric down-conversion (SPDC) is demonstrated using AlGaAs-on-insulator (AlGaAs-OI) waveguides. This is further investigated through second-harmonic generation (SHG), and the losses close to the material bandgap.
High-order topological quantum optical states in cold atomic metasurfaces
Authors: Wang B. X. , Zhao C. Y.
Published: September 2023

We study high-order topological quantum optics in an ultracold atom meta-surface. Results show topological states can mediate strong coherent interactions between two remote impurity quantum emitters while suppressing dissipative losses.
Generalized Conditional Displacement
Authors: Even-Haim Shiran , Diringer Asaf A. , Ruimy Ron , Baranes Gefen , Gorlach Alexey , Hacohen-Gourgy Shay , Kaminer Ido
Published: September 2023

We present a generalization of the conditional displacement operator, conditioned on a quditancilla, and discuss possible implementations. This generalization provides a building block for quantum computation with grid states, allowing efficient error correction protocols.
Generation of Squeezed State of Motion for Atoms in Optical Tweezers
Authors: Martin R. , de Léséleuc S. , Chew Y. , Tomita T. , Mahesh T. P. , Sugawa S. , Ohmori K.
Published: September 2023

To decrease quantum fluctuations of position of atoms in optical tweezers, we create squeezed state of motion. This opens the path for improved fidelity of operation with interacting Rydberg atoms.
Experimental Single-qubit Variable-strength Measurement Using a Quantum Computer
Authors: Dong Tingrui , Beak Soyoung , Kaneda Fumihiro , Edamatsu Keiichi
Published: September 2023

We demonstrate the single-qubit variable-strength measurement and the error-disturbance relation in a quantum computer. It illustrated that an quantum computer can be a useful platform for exploring the foundation of quantum physics.
Classical Simulation of Quantum Teleportation
Authors: La Cour Brian R.
Published: September 2023

Teleportation is considered to be a uniquely quantum phenomena. This paper demonstrates that the teleportation of quantum states in optical experiments can be under-stood from a purely classical perspective.
Extracting Information from Partial Hamiltonian of Simple Molecules for Designing Efficient Variational Quantum Eigensolvers
Authors: Singh Harshdeep , Mishra Sabyashachi , Majumder Sonjoy
Published: September 2023

This work aims to study the qubit Hamiltonian of a molecule term-by-term to understand their contributions, and if any information can be extracted by just considering a few selected terms of the Hamiltonian, a technique called partial Hamiltonian analysis (PHA).
Two-mode squeezing over deployed fiber coexisting with conventional communications
Authors: Chapman Joseph C. , Miloshevsky Alexander , Lu Hsuan-Hao , Rao Nageswara , Alshowkan Muneer , Peters Nicholas A.
Published: September 2023

We demonstrate distribution of two-mode squeezing to two separate locations and implement joint homodyne detection. We also show multiplexing with multiple clas-sical signals. We distribute squeezing over several 5-km spools and 0.5-km deployed fiber.
A Versatile and Low-Error Polarization Encoder for Quantum Communications
Authors: Agnesi Costantino , Avesani Marco , Berra Federico , Calderaro Luca , Cocchi Sebastiano , Foletto Giulio , Scalcon Davide , Stanco Andrea , Vallone Giuseppe , Villoresi Paolo
Published: September 2023

In addition to stable, low-error and calibration-free polarization modulation, the iPOGNAC encoder can be promptly reconfigured for time-bin encoding, intensity modulation, and operations at different wavelengths. An overview of these applications and results is given.
Noise Modeling for Entanglement-Swapping Quantum Networks
Authors: Johnson Spencer J. , Dhara Prajit , Lohrmann Alexander , Mohageg Makan , Guha Saikat , Kwiat Paul G.
Published: September 2023

Future quantum networks will require high-fidelity entanglement swapping at fast rates to connect distant nodes. We present a generalizable network model for memoryless entanglement swapping accounting for noise from imperfect sources, links, and detectors.
Photonic Orbital Angular Momentum for Novel Protocols in QKD and Certified Deletion
Authors: Hufnagel Felix , Stasiuk Mikka , Gao Xiaoqin , Bouchard Frédéric , Broadbent Anne , Heshami Khabat , Karimi Ebrahim
Published: September 2023

We have shown the versatility of orbital angular momentum by performing two new quantum communication protocols: a high-dimensional extension to the two-dimensional round robin differential phase shift QKD, and high-dimensional quantum encryption with certified deletion.
Fully chip-based decoder for polarization-encoding quantum key distribution
Authors: Du Yongqiang , Zhu Xun , Hua Xin , Zhao Zhengeng , Hu Xiao , Qian Yi , Xiao Xi , Wei Kejin
Published: September 2023

We propose a fully chip-based decoder for polarization-encoding quantum key distribution. The chip realizes a polarization state analyzer and compensates for the BB84 protocol without requiring additional hardware.
An Adaptive Error Correction Method for QKD Based on Deep Neural Network
Authors: Zhou Chao , Guo Hong
Published: September 2023

We proposed an adaptive error correction method based on deep neural network for quantum key distribution, which can achieve stable reconciliation efficiency with low frame error rate and low complexity.
Development of a High-Purity Quantum Random Number Generator Based on Bose-Einstein Statistics
Authors: Duda Charlotte Kate , Newell Raymond Thorson
Published: September 2023

We present a 200 Mbps quantum random number generator based on Bose-Einstein statistics, where 98.7 % of the min-entropy is traceable to the quantum signal. The bit stream is then shown to pass numerous statistical tests.
Experimental verifying partial device-independent one-way quantum computing
Authors: Chen Shih-Hsuan , Xu Jia-Cheng , Huang Ni-Ni , Tsai Tung-Ju , Sun Sheng-Yan , Kao Wei-Ting , Li Yu-Cheng , Li Che-ming
Published: September 2023

We propose a method to examine and quantify the capability of a one-way
quantum computation task against mimicry that contains classical
participants. We also experimentally demonstrate how the proposed
measure can reflect the imperfection and defect in implementing a
one-way quantum computation task with a polarization four-photon
system.
Experimental Characterization of a Simple Entanglement Distribution Link
Authors: Alwehaibi Yazeed , Alsaui Abdulmohsen , Prabhakar Anil
Published: September 2023

We utilize an efficient time-multiplexing scheme to analyze polarization correlations of entangled photon pairs and study the effect of the coincidence window period and dispersion on visibility. The observed visibility is greater than 67%.
Toward High-Efficiency Quantum Transduction between Superconducting Circuits and Cold-Atom Clouds
Authors: Demircan Samet , Stankus Paul , Figueroa Eden
Published: September 2023

An interface between superconducting circuits and atomic systems is the key for distributed quantum computing. We develop a scheme to strongly couple a superconducting microwave resonator to a cold-atom cloud for efficient quantum optical transduction.
Characterization of a Room Temperature Two Electronic Spin Gate in Diamond
Authors: Joas Timo , Sailer Roberto , Kimura Kosuke , Said Ressa , Kada Wataru , Onoda Shinobu , Jelezko Fedor
Published: September 2023

We characterize error sources in a two qubit gate between two nitrogen vacancy centers and estimate their influence on the gate fidelity. This will allow simpler gate design than numerical optimization.
Towards Deterministic Optical Quantum Gates with Dispersion-Engineered Temporal Trapping
Authors: Hamerly Ryan , Yanagimoto Ryotatsu , Ng Edwin , Jankowski Marc , Nehra Rajveer , Marandi Alireza , Mabuchi Hideo
Published: September 2023

We introduce a new mode of optical confinement, dispersion-engineered temporal trapping, that circumvents the tradeoff between Q and V, opening a route to room-temperature optical strong coupling and deterministic quantum gates.
Generation of Two-Dimensional Cluster States Using Hyperentanglement
Authors: Nemirovsky-Levy Liat , Lubarov Mark , Segev Mordechai
Published: September 2023

We present a technique for generating a two-dimensional cluster state, with a graphene topology. We exploit hyperentangled states, delay loops, and geometrical phase masks that act as beam splitters for different degrees of freedom.
Free-electron interactions with photonic GKP states: error correction and universal quantum computation
Authors: Even-Haim Shiran , Baranes Gefen , Ruimy Ron , Gorlach Alexey , Dahan Raphael , Diringer Asaf A. , Hacohen-Gourgy Shay , Kaminer Ido
Published: September 2023

We find that interactions of coherently-shaped free electrons with photons enable universal quantum computation and error correction with GKP qubits. The electron can entangle multiple GKP qubits, creating GHZ and cluster states.
Highly fault-tolerant quantum computing using both discrete and continuous variables of light
Authors: Jeong Hyunseok , Lee Seok-Hyung , Omkar Srikrishna , Teo Yong Siah
Published: September 2023

Fault-tolerant photonic quantum computing schemes have suffered low photon-loss thresholds and heavy resource requirements particularly when using single-photon qubits. Recently, several approaches utilizing both discrete and continuous variables of light have been proposed to reach high photon-loss thresholds with relatively low resource requirements. Here we present two schemes that outperform known previous schemes in terms of photon-loss thresholds and resource overheads. The first one is a hybrid scheme that combines discrete-variable (DV) and continuous-variable (CV) states of light. This scheme is nearly ballistic in the sense that passive measurements with hybrid entangled states are sufficient with little feedforwards. The second scheme is based on the parity-based encoding and Bayesian error tracking that enables one to reach a significantly high photon-loss threshold of ~8.5% with moderate resource requirements compared to previous known schemes.
Squeezed Matter-Wave Interferometer and Momentum Exchange Interaction in a High-Finesse Cavity
Authors: Luo Chengyi , Greve Graham P. , Koh Vanessa P. , Wu Baochen , Zhang Haoqing , Wilson John D. , Chu Anjun , Holland Murray J. , Rey Ana Maria , Thompson James K.
Published: September 2023

An entanglement-enhanced matter-wave interferometer is demonstrated in a high-finessecavity with
1.7−0.5+0.5 dB directly observed phase resolution below the standard quantum limit. By exploiting the interaction between matter-wave and cavity, we also demonstrate a cavity-medicated momentum exchange interaction.
Wideband Simultaneous Microwave Demodulation with a Rydberg Quantum Sensor
Authors: Hill Joshua C. , Meyer David H. , Cox Kevin C. , Kunz Paul D.
Published: September 2023

We demonstrate simultaneous demodulation and heterodyne detection of five free-space microwave signals spanning 1.7 GHz to 116 GHz using an electric field sensor based on Rydberg atom electromagnetically induced transparency.
Albert: a cloud-based quantum sensor development platform for the masses
Authors: Fitch Noah , North Hannah , Tingle Alex
Published: September 2023

Infleqtion’s cloud-accessible platform “Albert” enables the development of quantum sensors using ultracold Bose-condensed atoms together with dynamically reconfigurable optical fields. We will introduce the platform and explore how users can leverage it for sensor development.
Hybrid Sources of Quantum Light Based on Atom-mediated Nonlinear Optical Interactions
Authors: Krstić Aleksa , Tiwari Priyanshu , Setzpfandt Frank , Peschel Ulf , Saravi Sina
Published: September 2023

We propose a scheme for a hybrid source of quantum light, consisting of a 2-level emitter embedded in a nonlinear cavity, that can generate multiple-pair number states with significantly enhanced probability compared to conventional sources.
Engineering of Spectral Correlations of the Two-Photon State in Parametric Down-Conversion via Spatial Mode Projection
Authors: Sevilla-Gutiérrez Carlos , Kaipalath Varun Raj , Steinlechner Fabian
Published: September 2023

We report an innovative method to shape the spectral properties of the two-photons state in parametric down-conversion by exploiting the spatial-spectral correlations in terms of the spectral dependence of the Laguerre-Gauss spatial basis.
Optically Addressable Magnesium-Vacancy Color Centers in Diamond
Authors: Hernández E. Nieto , Corte E. , Andrini G. , Pugliese V. , Costa Â. , Magchiels G. , Moens J. , Tunhuma S. Malven , Villareal R. , Pereira L.M.C. , Vantomme A. , Correia J. Guilherme , Bernardi E. , Traina P. , Degiovanni I.P. , Moreva E. , Genovese M. , Tchernij S. Ditalia , Olivero P. , Wahl U. , Forneris J.
Published: September 2023

We report on a systematic optical and structural investigation of the MgV color center in diamond. The results show unique tunable properties of the center making it appealing for its utilization in quantum information processing.
Cryogenic Degenerate Spontaneous Parametric Down-Conversion
Authors: Lange Nina Amelie , Schapeler Timon , Höpker Jan Philipp , Protte Maximilian , Bartley Tim J.
Published: September 2023

We show a HOM dip between degenerate signal and idler photons at (1559.33 ± 0.05) nm from cryogenic integrated SPDC in lithium niobate, compatible with superconducting detectors. This is enabled by precise control over the cryogenic phase-matching.
Towards a Fiber-Coupled Quantum Dot Single Photon Source for a Quantum Internet Testbed
Authors: Meier Kristina , Duda Charlotte , Ryan Duncan , Hollingsworth Jennifer , Newell Raymond
Published: September 2023

We present progress toward a packaged quantum dot single-photon source with emission at telecom wavelengths, coupled into a single-mode fiber using a bullseye antenna. This source will be optimized for a fiber-based quantum internet testbed.
Characterizing the performance of QKD transceiver platforms in a hybrid quantum network testbed
Authors: Fritsch Samuel , Olearain Andre , Kaufman Alexander , Babbitt Wm. Randall , Rupavatharam Krishna Mohan
Published: September 2023

A hybrid quantum network using multicore fibers, that supports both classical and quantum communications is implemented. Commercially available Quantum Key Distribution (QKD) systems were tested for loss tolerance, vulnerability to direct injection attacks, and the ability to generate secret keys in the presence of co-propagating classical communications was investigated. The loss of visibility, increase in the quantum bit error rate, and failure to generate secret keys is observed when an externally injected optical power typically exceeds -26 dBm. The dependence of the QKD operational vulnerability on copropagating signal wavelengths and implications for hybrid communications are discussed.
On the comparison of two integrated photon-pair sources through on-chip Hong-Ou-Mandel interference
Authors: Sanna Matteo , Lee Jong-Moo , Baldazzi Alessio , Azzini Stefano , Ahn Joon Tae , Lee Myung Lae , Sohn Young-Ik , Pavesi Lorenzo
Published: September 2023

We demonstrate and compare the on-chip Hong-Ou-Mandel interference be-tween two micro-ring resonators and two straight waveguides used as indistinguishable twin photons sources for quantum photonic applications.
Plasmon Enhanced Polarized Single Photon Emission into Optical Fiber
Authors: Shafi K. Muhammed , Yalla Ramachandrarao , Nayak Kali P.
Published: September 2023

We demonstrate a bright and strongly polarized single-photon source directly coupled into an optical fiber. The system is realized by combining single quantum dots and gold nanorods on optical nanofiber.
Silicon-vacancy nanodiamonds on an optical nanofiber for quantum technologies
Authors: Yalla Ramachandrarao , Kojima Y. , Fukumoto Y. , Suzuki H. , Ariyada O. , Shafi K. M. , Nayak K. P.
Published: September 2023

We demonstrate a fiber-based hybrid nanophotonic device by combining an optical nanofiber and nanodiamonds with silicon-vacancy centers. The current work will lead to intriguing research and applications in quantum technologies.
Strong Zero-Phonon Transition from Defects in SiC Nanowires with Stacking Faults
Authors: Lee Jin Hee , Kim Je-Hyung
Published: September 2023

We study SiC nanowires that host point defects coupled to a few-layered stacking fault. These point-planar defect complexes exhibit outstanding optical properties of high brightness, fast recombination time, and a high Debye-Waller factor.
Atmospheric Turbulence Simulator to Study Photon Pair Indistinguishability in Free-Space Optical Networks
Authors: Wyman Keith , Patnaik Anil
Published: September 2023

To study the effects of atmospheric turbulence on the indistinguishability of photons propagating from a ground station to a satellite, we built and characterized an atmospheric turbulence simulator (ATS) in a laboratory setting.
Effective-Spin Models From a Single Atom for Steady-State Nonclassical Light Generation
Authors: Elliott A. E. J. , Parkins S.
Published: September 2023

Raman transitions between atomic sublevels in a continuously-driven, single-atom cavity QED system are explored for the generation of a variety of nonclassical states of the output light.
High-performance Silicon Nitride photonic devices for quantum circuits at near-visible wavelengths
Authors: Sanna Matteo , Baldazzi Alessio , Azzini Stefano , Piccoli Gioele , Ghulinyan Mher , Pavesi Lorenzo
Published: September 2023

We present the realization of high-performance photonic devices integrated on Silicon Nitride for a fully-integrated room-tempertaure quantum photonic platform.
Enhanced fiber coupled single photon source based on a quantum dot coupled to a gold nanoparticle
Authors: Xuan Yining , Sugawara Masakazu , Sun Rui , Baek Soyoung , Mitsumori Yasuyoshi , Edamatsu Keiichi , Sadgrove Mark
Published: September 2023

In order to obtain a bright single photon source, we utilize the leaky optical cavity provided by a gold nanorod and obtain 62 times Purcell enhancement for the quantum dot on the nanofiber.
Spectrally Pure Heralded Single Photons at Telecommunication O-Band from a Custom-Poled KTiPO4 Crystal
Authors: Cai Wu-Hao , Jin Rui-Bo , Edamatsu Keiichi , Kaneda Fumihiro
Published: September 2023

We design a custom periodically poled KTiOPO4 crystal to generate a high spectral purity (99.99%) heralded single photons at the telecom O-band. Our designed source is feasible with currently available pump lasers and single-photon detectors.
Diffraction-Limited Cryogenic Imaging of Quantum Emitters for Deterministic Photonic Integration
Authors: Krieger Tobias M. , Rota Michele B. , Freund Julia , Covre da Silva Saimon F. , Manna Santanu , Trotta Rinaldo , Rastelli Armando
Published: September 2023

Limited spatial overlap of self-assembled semiconductor quantum dots with photonic structures hinders the scalability of entangled photon sources. Here we present a marker-based cryogenic imaging system enabling strain-tunable and cavity-enhanced quantum dots emitting highly-entangled photons.
Engineering Spatial Entanglement of Photon Pairs Generated from Parametric Down-Conversion
Authors: Baek Soyoung , Kaneda Fumihiro , Mitsumori Yasuyoshi , Edamatsu Keiichi
Published: September 2023

We present our recent progress on developing a parametric down-conversion source producing highly entangled photons in spatial mode toward quantum-enhanced spa-tial measurements. The degree of transverse spatial entanglement is engineered and characterized.
Fiber-coupled source of polarization-entanglement at ~ 1550-nm
Authors: Yadav Vikash Kumar , Venkataraman Vivek , Ghosh Joyee
Published: September 2023

We report an efficient source of polarization-entangled photon-pairs at telecom wavelength of 1550-nm using a fiber-pigtailed MgO:PPLN ridge-waveguide. The φ+ Bell-state is generated with >84% fidelity violating the CHSH inequality by >10 standard deviations.
Deterministic Creation of Single-Photon Emitters in Transition Metal Dichalcogenides using Nanoparticle Stressors
Authors: Thoppil Jithin S , Shit Sumitra , Waheed Yunus , Prasad Indrajeet D , Kumar Santosh
Published: September 2023

We present a simple approach for deterministically creating quantum-light emitters in a WS2 monolayer via transferring onto spin-coated SiO2 nanoparticles acting as local stressors leading to the emission of single photons due to localization of excitons.
Long-Distance High-Dimensional Quantum Key Distribution Field Test Using Energy-Time Entanglement
Authors: Liu Jingyuan , Lin Zhihao , Liu Dongning , Feng Xue , Liu Fang , Cui Kaiyu , Huang Yidong , Zhang Wei
Published: September 2023

We present a high-dimensional quantum key distribution field test using energy-time entangled photon pairs over 242 km partially deployed fiber. We demonstrate system stability and robustness over 7 days with a fully passive experimental setup.
Metropolitan Single-Photon Distribution at 1550 nm for Random Number Generation
Authors: Gyger Samuel , Zeuner Katharina D. , Lettner Thomas , Bensoussan Sandra , Carln¨as Martin , Ekemar Liselott , Schweickert Lucas , Hedlund Carl Reuterskiöld , Hammar Mattias , Nilsson Tigge , Almlöf Jonas , Steinhauer Stephan , Llosera Gemma Vall , Zwiller Val
Published: September 2023

Quantum communication networks are used for QKD and metrological applications. We present research connecting two nodes ≈ 20 kilometers apart over the municipal fiber network using semiconductor quantum dots emitting at 1550 nm.
Precision Synchronization for Long-distance Free-space Quantum Networking
Authors: Spellmeyer Neal W. , Lee Catherine , Scheinbart Marvin , Hamilton Scott A.
Published: September 2023

We describe a laboratory implementation of a precision synchronization technique suitable for high-rate entanglement distribution between two ground sites via a satellite, including recent improvements for extending the technique to larger Doppler ranges.
Towards entangling two atomic quantum memories separated by 158 km
Authors: Du Dounan , Castillo-Veneros Leonardo , Cui Guodong , Cottrill Dillion , Martínez-Rincón Julián , Stankus Paul , Katramatos Dimitrios , Figueroa Eden
Published: September 2023

We present our progress towards entangling two distantly located quantum memories using quantum frequency conversion and HOM interference. We obtained a conversion efficiency of 50% and a HOM visibility of about 47%.
High-Power Single-Frequency VECSEL Platform for Quantum Technology
Authors: Penttinen Jussi-Pekka , Kantola Emmi , Uusitalo Topi , Ranta Sanna , Hietalahti Arttu , Vuohenkunnas Roope , Reuna Jarno , Guina Mircea
Published: September 2023

Vertical-external-cavity surface-emitting lasers (VECSEL) have emerged as a very attractive platform for quantum technology applications utilizing ions, atoms, and molecules. This laser platform exhibits a unique combination of features including, high-power single-frequency operation, small SWaP-C parameter, and the ability to cover a broad wavelength range from the ultraviolet, to visible and infrared extending to 2 µm. VECSEL-based systems have been already used in a wide variety of quantum information processing tasks, including spectroscopy, photoionization, and laser cooling. Progress in the development of commercial single-frequency VECSELs and application examples for selected atomic species, such Sr and Yb are reviewed. Recent experiments demonstrating new capability for wavelength versatility and frequency locking with linewidth narrowing to sub-Hz level are presented.
AOM-Free Laser Stabilization using integrated Silicon Nitride Carrier-Tracking Stress-Optic Modulator and Reference Cavity
Authors: Wang Jiawei , Liu Kaikai , Rudy Ryan Q. , Blumenthal Daniel J.
Published: September 2023

A laser stabilization scheme is demonstrated with 40-dB noise reduction and sub-kHz ILW using an integrated carrier-tracking Si3N4 stress-optic modulator to replace the AOM and EOM for PDH locking to an integrated Si3N4 reference cavity.
Defining the Standard Quantum Limit of Heterodyne between a Continuous Wave Laser and an Optical Frequency Comb
Authors: Tsao Eugene , Lordi Noah , Lind Alex , Heyrich Matthew , Combes Josh , Diddams Scott A.
Published: September 2023

Optical clocks employ heterodyne between a laser and a frequency comb, yet the quantum description of this measurement is unknown. We define measurement operators and the standard quantum limit, and demonstrate progress reaching this limit.
Progress toward a continuous superradiant laser
Authors: Niu Zhijing , Schäfer Vera M. , Cline Julia R.K. , Young Dylan J. , Song Yilun , Thompson James K.
Published: September 2023

We demonstrate continuous loading of strontium atoms into a high finesse ring cavity and observe continuous strong collective coupling in the form of a vacuum Rabi splitting between the atoms and the cavity on the 7.5 kHz 1S0 to 3P1 transition.
Enhancing Interferometer Sensitivity Using Kerr Squeezing in Fibers
Authors: Kalinin Nikolay , Dirmeier Thomas , Sánchez-Soto Luis L. , Leuchs Gerd , Andrianov Alexey V.
Published: September 2023

We present an all-fiber robust setup for polarization squeezing generation using the Kerr effect in fibers. For the first time, a third-order nonlinearity is used to demonstrate interferometer sensitivity enhancement beyond the shot noise limit.
Low-noise Quantum Frequency Conversion of Single Photons from SiV Centers in Diamond
Authors: Schäfer Marlon , Kambs Benjamin , Herrmann Dennis , Bauer Tobias , Becher Christoph
Published: September 2023

We present highly efficient quantum frequency down-conversion of photons resonant to silicon-vacancy centers in diamond. By using a two-stage conversion scheme we achieve a very low noise photon rate of 7.2(5) cps.
Polarization-Preserving Quantum Frequency Conversion for Entanglement Distribution in Trapped-Atom based Urban Area Quantum Networks
Authors: Bauer Tobias , Becher Christoph
Published: September 2023

We present a compact, robust and transportable quantum frequency converter for polarization preserving conversion of 40Ca+ resonant photons to the telecom C-band with high and long-term stable efficiency of 50% and low conversion-induced background noise of 18 Hz.
Spectroscopy of Magnons and Optical Satellite Lines in a Rare-Earth Antiferromagnet Towards Quantum Transduction
Authors: Hiraishi Masaya , Hunter-Smith Gabby , King Gavin G. G. , Trainor Luke S. , Longdell Jevon J.
Published: September 2023

We perform microwave and optical spectroscopy on Nd3+-ions in an antiferromagnetically ordered NdGaO3 crystal. We see collective excitation of Nd3+-spins at microwave frequencies and satellite lines in the optical spectra with narrow inhomogeneous linewidths.
Near-Field, Plasmonically-Enabled Entanglement for Quantum Networks
Authors: Bello Frank D. , Kongsuwan Nuttawut , Keating Geoffrey , Clarke Daniel D. A. , Wigger Daniel , Tarasenko Illya , Donegan John F. , Hess Ortwin
Published: September 2023

We explore the entanglement of quantum emitters using subdiffracted light within a near-field plasmonic environment. Results show possibilities for the performance of quantum operations using fully integrated photonic and plasmonic waveguides on ultrafast time scales.
Cavity-Assisted highly efficient Atomic Frequency Comb solid-state Quantum Memory
Authors: Duranti Stefano , Wengerowsky Sören , Feldmann Leo , Seri Alessandro , Casabone Bernardo , de Riedmatten Hugues
Published: September 2023

We report a record high-efficiency a tomic f requency c omb q uantum m emory u sing a Pr3+ :Y2SiO5 crystal embedded in an impedance-matched cavity. We achieve an efficiency of 62 % for weak coherent pulses and 52 % for time-bin qubits
Quantum-repeater cell based on free space coupled 40Ca+ ions
Authors: Bergerhoff Max , Elshehy Omar , Kucera Stephan , Kreis Matthias , Eschner Jürgen
Published: September 2023

We demonstrate the implementation of a quantum repeater cell with photons from two free-space-coupled 40Ca+ ions. We generate asynchronous ion-photon entanglement and transfer it to photon-photon entanglement by a quantum gate and a measurement.
Quantum Storage of Entangled Photons at Telecom Wavelengths in a Crystal
Authors: Jiang Ming-Hao , Xue Wenyi , He Qian , An Yu-Yang , Zheng Xiaodong , Xu Wen-Jie , Wen Wenjun , Xie Yu-Bo , Lu Yanqing , Zhu Shining , Ma Xiao-Song
Published: September 2023

We demonstrate a 400-ns storage of the time-bin entanglement between two telecom photons generated from an integrated silicon nitride chip with a 167Er3+:Y2SiO5 crystal, essential in the quantum-repeater architectures for realizing global fiber-based quantum networks.
Precise Control of Nuclear Spin-Based Memories for Quantum Networks
Authors: Takou Evangelia , Barnes Edwin , Economou Sophia E.
Published: September 2023

We develop a general formalism to precisely control the entanglement generation in an arbitrarily large nuclear spin memory register coupled to a defect electron. We showcase the performance of the entangling gates using experimental parameters.
Multiplexing-Enhanced Generation of Photon Trains
Authors: Lualdi Colin P. , Kwiat Paul G.
Published: September 2023

We validate time multiplexing as a method for implementing efficient heralded single-photon sources by detecting trains of up to five sequential photons. We demonstrate a factor of 1,000 improvement in the five-photon train detection rate.
Approaching Mega-Scale Quantum Detector Tomography using High-Performance Computing
Authors: Schapeler Timon , Lass Michael , Plessl Christian , Bartley Tim J.
Published: September 2023

Quantum characterization tools must keep up with the ever-increasing size of detector arrays for quantum applications. We show quantum detector tomography per-formed on a supercomputer which reconstructs the POVMs up to 2.5 · 105 photons.
Twisted single photon source with high-purity and tunability
Authors: Zhao Haoqi , Ma Yichen , Gao Zihe , Liu Na , Wu Tianwei , Wu Shuang , Feng Xilin , Hone James , Strauf Stefan , Feng Liang
Published: September 2023

Twisted single photons, carrying orbital angular momentum (OAM), could address the growing demand for high-dimensional quantum information encoding and transmission. By hybrid integration of two-dimensional semiconductor WSe2 with a spin-orbit-coupled microring resonator, we demonstrate a twisted single photon source with the ability to precisely define and switch between highly pure spin-OAM states.
Age-differentiated incentives for adaptive behavior during epidemics produce oscillatory and chaotic dynamics
Authors: Arthur Ronan F. , Levin May , Labrogere Alexandre , Feldman Marcus W.
Published: September 2023

Heterogeneity in contact patterns, mortality rates, and transmissibility among and between different age classes can have significant effects on epidemic outcomes. Adaptive behavior in response to the spread of an infectious pathogen may give rise to complex epidemiological dynamics. Here we model an infectious disease in which adaptive behavior incentives, and mortality rates, can vary between two and three age classes. The model indicates that age-dependent variability in infection aversion can produce more complex epidemic dynamics at lower levels of pathogen transmissibility and that those at less risk of infection can still drive complexity in the dynamics of those at higher risk of infection. Policymakers should consider the interdependence of such heterogeneous groups when making decisions.