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arXiv 2022年

作者： Albaladejo, Miguel Battaglieri, Marco Bibrzycki, Lukasz Celentano, Andrea Danilkin, Igor V. Dawid, Sebastian M. Döring, Michael Fanelli, Cristiano Fernández-Ramírez, César Gonzàlez-Solís, Sergi Hiller Blin, Astrid N. Jackura, Andrew W. Mathieu, Vincent Mikhasenko, Mikhail Mokeev, Victor I. Passemar, Emilie Perry, Robert J. Pilloni, Alessandro Rodas, Arkaitz Shepherd, Matthew R. Sherrill, Nathaniel Silva-Castro, Jorge A. Skwarnicki, Tomasz Szczepaniak, Adam P. Winney, Daniel Centro Mixto CSIC-Universidad de Valencia ValenciaE-46071 Spain INFN Sezione di Genova GenovaI-16146 Italy Pedagogical University of Kraków Kraków30-084 Poland Institut für Kernphysik & PRISMA+ Cluster of Excellence Johannes Gutenberg Universität MainzD-55099 Germany Center for Exploration of Energy and Matter Indiana University BloomingtonIN47403 United States Department of Physics Indiana University BloomingtonIN47405 United States George Washington University WashingtonDC20052 United States Laboratory for Nuclear Science Massachusetts Institute of Technology CambridgeMA02139 United States MadridE-28040 Spain Instituto de Ciencias Nucleares Universidad Nacional Autónoma de México Ciudad de México04510 Mexico Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Institute for Theoretical Physics Tübingen University Tübingen72076 Germany Theory Center Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States Department of Physics Old Dominion University NorfolkVA23529 United States Departament de Física Quàntica i Astrofísica Institut de Ciències del Cosmos Universitat de Barcelona E-08028 Spain Departamento de Física Teórica Universidad Complutense de Madrid IPARCOS Madrid28040 Spain ORIGINS Excellence Cluster Munich80939 Germany Ludwig-Maximilian University of Munich Germany Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States Institute of Physics National Chiao-Tung University 1001 Ta-Hsueh Road Hsinchu30010 Taiwan Dipartimento di Scienze Matematiche e Informatiche Scienze Fisiche e Scienze della Terra Università degli Studi di Messina MessinaI-98122 Italy INFN Sezione di Catania CataniaI-95123 Italy Department of Physics College of William and Mary WilliamsburgVA23187 United States Department of Physics and Astronomy University of Sussex BrightonBN1 9QH United Kingdom Syracuse University SyracuseNY13244 United States Guangdong-

We highlight the need for the development of comprehensive amplitude analysis methods to further our understanding of hadron spectroscopy. Reaction amplitudes constrained by first principles of S-matrix theory and by QCD phenomenology are needed to extract robust interpretations of the data from experiments and from lattice calculations. Copyright © 2022, The Authors. All rights reserved.

关键词： Calculations

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Temperature study of rydberg exciton optical properties in Cu2O

arXiv

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arXiv 2021年

作者： Kang, Dongyeon Daniel Gross, Aaron Yang, HeeBong Morita, Yusuke Choi, Kyung Soo Yoshioka, Kosuke Kim, Na Young Institute for Quantum Computing University of Waterloo 200 University Ave. West WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo 200 University Ave. West WaterlooONN2L 3G1 Canada Department of Physics Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Photon Science Center School of Engineering The University of Tokyo 2-11-16 Yayoi Bunkyo-ku Tokyo113-8656 Japan Department of Physics and Astronomy University of Waterloo 200 University Ave. West WaterlooONN2L 3G1 Canada Department of Chemistry University of Waterloo 200 University Ave. West WaterlooONN2L 3G1 Canada Perimeter Institute for Theoretical Physics 31 Caroline St. N WaterlooONN2L 2Y5 Canada

Rydberg excitons in Cu2O can be an emergent platform for solid-state quantum information processing by utilizing the exaggerated properties of high-lying excited states within the material. To develop practical quantum systems, high-temperature operation is desirable. Here, we study the temperature-dependence of the yellow and green Rydberg exciton resonances in a thin Cu2O crystal via broad-band phonon-assisted absorption spectra between 4 K and 100 K. At 4 K, we can identify the principal quantum number n = 11 yellow and n = 4 green Rydberg exciton states, beyond which we are limited by the spectral resolution of standard absorption techniques. Above liquid nitrogen boiling temperature (∼80 K), the n = 6 yellow and n = 4 green Rydberg exciton states are readily captured and higher-temperature yellow Rydberg exciton optical properties still exhibit the standard scaling laws seen at low temperatures. This promising result lays the groundwork for a new route to build a high-temperature Rydberg quantum information processing architecture with solid-state Cu2O. © 2021, CC BY-NC-ND.

关键词： Temperature distribution

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Practical security of continuous-variable quantum key distribution with reduced optical attenuation

arXiv

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arXiv 2019年

作者： Zheng, Yi Huang, Peng Huang, Anqi Peng, Jinye Zeng, Guihua College of Information Science and Technology Northwest University Xi’anShaanxi710127 China State Key Laboratory of Advanced Optical Communication Systems and Networks Center of Quantum Information Sensing and Processing Shanghai Jiao Tong University Shanghai200240 China Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China Greatwall Quantum Laboratory China Greatwall Technology Changsha410205 China

In a practical CVQKD system, the optical attenuator can adjust the Gaussian-modulated coherent states and the local oscillator signal to an optimal value for guaranteeing the security of the system and optimizing the performance of the system. However, the performance of the optical attenuator may deteriorate due to the intentional and unintentional damage of the device. In this paper, we investigate the practical security of a CVQKD system with reduced optical attenuation. We find that the secret key rate of the system may be overestimated based on the investigation of parameter estimation under the effects of reduced optical attenuation. This opens a security loophole for Eve to successfully perform an intercept-resend attack in a practical CVQKD system. To close this loophole, we add an optical fuse at Alice’s output port and design a scheme to monitor the level of optical attenuation in real time, which can make the secret key rate of the system evaluated precisely. The analysis shows that these countermeasures can effectively resist this potential attack. Copyright © 2019, The Authors. All rights reserved.

关键词： Electromagnetic wave attenuation

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Enhancing secure key rates of satellite QKD using a quantum dot single-photon source

arXiv

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arXiv 2020年

作者： Chaiwongkhot, Poompong Hosseini, Sara Ahmadi, Arash Higgins, Brendon L. Dalacu, Dan Poole, Philip J. Williams, Robin L. Reimer, Michael E. Jennewein, Thomas Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada Department of Physics Faculty of Science Mahidol University Bangkok10400 Thailand Walter Schottky Institute Technische Universitt Mnchen Garching85748 Germany National Research Council of Canada OttawaONK1A 0R6 Canada Department of Electrical & Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada

Global quantum secure communication can be achieved using quantum key distribution (QKD) with orbiting satellites. Established techniques use attenuated lasers as weak coherent pulse (WCP) sources, with so-called decoy-state protocols, to generate the required single-photon-level pulses. While such approaches are elegant, they come at the expense of attainable final key due to inherent multi-photon emission, thereby constraining secure key generation over the high-loss, noisy channels expected for satellite transmissions. In this work we improve on this limitation by using true single-photon pulses generated from a semiconductor quantum dot (QD) embedded in a nanowire, possessing low multi-photon emission (−6) and an extraction system efficiency of −15 dB (or 3.1%). Despite the limited efficiency, the key generated by the QD source is greater than that generated by a WCP source under identical repetition rate and link conditions representative of a satellite pass. We predict that with realistic improvements of the QD extraction efficiency to −4.0 dB (or 40%), the quantum-dot QKD protocol outperforms WCP-decoy-state QKD by almost an order of magnitude. Consequently, a QD source could allow generation of a secure key in conditions where a WCP source would simply fail, such as in the case of high channel losses. Our demonstration is the first specific use case that shows a clear benefit for QD-based single-photon sources in secure quantum communication, and has the potential to enhance the viability and efficiency of satellite-based QKD networks. Copyright © 2020, The Authors. All rights reserved.

关键词： Semiconductor quantum dots

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quantum neural networks with data re-uploading for urban traffic time series forecasting

引用

Scientific reports 2025年第1期15卷 19400页

作者： Nikolaos Schetakis Paolo Bonfini Negin Alisoltani Konstantinos Blazakis Symeon I Tsintzos Alexis Askitopoulos Davit Aghamalyan Panagiotis Fafoutellis Eleni I Vlahogianni Computational Mechanics and Optimization Laboratory School of Production Engineering and Management Technical University of Crete Chania 73100 Greece. nischetakis@tuc.gr. Quantum Innovation Pc Chania 73100 Greece. nischetakis@tuc.gr. Alma-Sistemi Srl Guidonia 00012 Italy. Univ Gustave Eiffel COSYS GRETTIA Paris F-77454 France. Department of Electrical and Computer Engineering Hellenic Mediterranean University Heraklion 71410 Greece. QUBITECH Pc Athens 15231 Greece. Institute of High Performance Computing A*STAR (Agency for Science Technology and Research) 1 Fusionopolis Way #16-16 Connexis Singapore 138632 Singapore. Department of Transportation Planning and Engineering School of Civil Engineering National Technical University of Athens 5 Iroon Polytechniou Str Zografou Campus 157 73 Athens Greece.

Accurate traffic forecasting plays a crucial role in modern Intelligent Transportation Systems (ITS), as it enables real-time traffic flow management, reduces congestion, and improves the overall efficiency of urban transportation networks. With the rise of quantum Machine Learning (QML), it has emerged a new paradigm possessing the potential to enhance predictive capabilities beyond what classical machine learning models can achieve. In the present work we pursue a heuristic approach to explore the potential of QML, and focus on a specific transport issue. In particular, as a case study we investigate a traffic forecast task for a major urban area in Athens (Greece), for which we possess high-resolution data. In this endeavor we explore the application of quantum Neural Networks (QNN), and, notably, we present the first application of quantum data re-uploading in the context of transport forecasting. This technique allows quantum models to better capture complex patterns, such as traffic dynamics, by repeatedly encoding classical data into a quantum state. Aside from providing a prediction model, we spend considerable effort in comparing the performance of our hybrid quantum-classical neural networks with classical deep learning approaches. We observe that, in fully connected network settings, hybrid quantum-classical models consistently underperform, with median scores approximately 10% worse than their purely classical counterparts across different configurations. In contrast, recursive architectures with data re-uploading show the opposite trend: hybrid models achieved up to 5% better median scores under comparable complexity settings. Additionally, these hybrid models converged in fewer training epochs, indicating improved training efficiency. Our results show that hybrid models achieve competitive accuracy with state-of-the-art classical methods, especially when the number of qubits and re-uploading blocks is increased. While the classical models demonstrate l

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Optical control of single-photon negative-feedback avalanche diode detector

arXiv

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arXiv 2019年

作者： Gras, Gaëtan Sultana, Nigar Huang, Anqi Jennewein, Thomas Bussières, Félix Makarov, Vadim Zbinden, Hugo ID Quantique SA CarougeCH-1227 Switzerland Group of Applied Physics University of Geneva GenevaCH-1211 Switzerland Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada Russian Quantum Center Skolkovo Moscow121205 Russia Shanghai Branch National Laboratory for Physical Sciences at Microscale and CAS Center for Excellence in Quantum Information University of Science and Technology of China Shanghai201315 China NTI Center for Quantum Communications National University of Science and Technology MISiS Moscow119049 Russia

We experimentally demonstrate optical control of negative-feedback avalanche diode (NFAD) detectors using bright light. We deterministically generate fake single-photon detections with a better timing precision than normal operation. This could potentially open a security loophole in quantum cryptography systems. We then show how monitoring the photocurrent through the avalanche photodiode can be used to reveal the detector is being blinded. Copyright © 2019, The Authors. All rights reserved.

关键词： Feedback

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K-core structure of real multiplex networks

arXiv

引用

arXiv 2019年

作者： Osat, Saeed Radicchi, Filippo Papadopoulos, Fragkiskos Deep Quantum Labs Skolkovo Institute of Science and Technology Moscow43026 Center for Complex Networks and Systems Research Luddy School of Informatics Computing and Engineering Indiana University BloomingtonIN47408 United States Department of Electrical Engineering Computer Engineering and Informatics Cyprus University of Technology 33 Saripolou Street Limassol3036

Multiplex networks are convenient mathematical representations for many real-world - biological, social, and technological - systems of interacting elements, where pairwise interactions among elements have different flavors. Previous studies pointed out that real-world multiplex networks display significant inter-layer correlations - degree-degree correlation, edge overlap, node similarities - able to make them robust against random and targeted failures of their individual components. Here, we show that inter-layer correlations are important also in the characterization of their k-core structure, namely the organization in shells of nodes with increasingly high degree. Understanding k-core structures is important in the study of spreading processes taking place on networks, as for example in the identification of influential spreaders and the emergence of localization phenomena. We find that, if the degree distribution of the network is heterogeneous, then a strong k-core structure is well predicted by significantly positive degree-degree correlations. However, if the network degree distribution is homogeneous, then strong k-core structure is due to positive correlations at the level of node similarities. We reach our conclusions by analyzing different real-world multiplex networks, introducing novel techniques for controlling inter-layer correlations of networks without changing their structure, and taking advantage of synthetic network models with tunable levels of inter-layer correlations. Copyright © 2019, The Authors. All rights reserved.

关键词： Network layers

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Controlling single-photon detector ID210 with bright light

arXiv

引用

arXiv 2019年

作者： Chistiakov, Vladimir Huang, Anqi Egorov, Vladimir Makarov, Vadim Faculty of Photonics and Optical Information ITMO University St. Petersburg Russia Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Russian Quantum Center Skolkovo Moscow143025 Russia Shanghai Branch National Laboratory for Physical Sciences at Microscale and CAS Center for Excellence in Quantum Information University of Science and Technology of China Shanghai201315 China NTI Center for Quantum Communications National University of Science and Technology MISiS Moscow119049 Russia Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada

We experimentally demonstrate that a single-photon detector ID210 commercially available from ID Quantique is vulnerable to blinding and can be fully controlled by bright illumination. In quantum key distribution, this vulnerability can be exploited by an eavesdropper to perform a faked-state attack giving her full knowledge of the key without being noticed. We consider the attack on standard BB84 protocol and a subcarrier-wave scheme, and outline a possible countermeasure. Copyright © 2019, The Authors. All rights reserved.

关键词： Avalanche photodiodes

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Anisotropic planar Hall effect in the type-II topological Weyl semimetal WTe2

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Physical Review B 2019年第20期100卷 205128-205128页

作者： Peng Li Chenhui Zhang Yan Wen Long Cheng George Nichols David G. Cory Guo-Xing Miao Xi-Xiang Zhang King Abdullah University of Science and Technology (KAUST) Physical Science and Engineering Division (PSE) Thuwal 23955-6900 Saudi Arabia Institute for Quantum Computing University of Waterloo Waterloo N2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo N2L 3G1 Canada Department of Chemistry University of Waterloo Waterloo N2L 3G1 Canada

The giant planar Hall effect arising from a chiral anomaly, and that is related to the Berry curvature, has been predicted but never observed in nonmagnetic type-II Dirac/Weyl semimetals. Here, we report an observation of the anisotropic planar Hall effect in type-II Weyl semimetal WTe2. Interestingly, we observe a chiral-anomaly-induced sinusoidal angular-dependent planar Hall effect when the electric field is parallel to the tilting direction of Weyl cone, i.e., the b axis of WTe2. The planar Hall effect amplitude is linearly dependent on the magnetic fields and decreases gradually as the temperature increases across the topological phase transition temperature. Our observations clearly reveal the footprints on transport from the chiral anomaly feature in type-II Weyl semimetals.

关键词： Hall effect Magnetoresistance Transport phenomena Topological materials Weyl semimetal

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General-purpose quantum circuit simulator with Projected Entangled-Pair States and the quantum supremacy frontier

arXiv

引用

arXiv 2019年

作者： Guo, Chu Liu, Yong Xiong, Min Xue, Shichuan Fu, Xiang Huang, Anqi Qiang, Xiaogang Xu, Ping Liu, Junhua Zheng, Shenggen Huang, He-Liang Deng, Mingtang Poletti, Dario Bao, Wan-Su Wu, Junjie Henan Key Laboratory of Quantum Information and Cryptography SSF IEU Zhengzhou450001 China Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China Information Systems Technology and Design Singapore University of Technology and Design 8 Somapah Road Singapore487372 Singapore Supremacy Future Technologies Guangzhou511340 China Center for Quantum Computing Peng Cheng Laboratory Shenzhen518055 China Hefei National Laboratory for Physical Sciences at Microscale Department of Modern Physics University of Science and Technology of China Hefei Anhui230026 China CAS Centre for Excellence Synergetic Innovation Centre in Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China Science and Math Cluster and EPD Pillar Singapore University of Technology and Design 8 Somapah Road Singapore487372 Singapore

Recent advances on quantum computing hardware have pushed quantum computing to the verge of quantum supremacy. Here we bring together many-body quantum physics and quantum computing by using a method for strongly interacting two-dimensional systems, the Projected Entangled-Pair States, to realize an effective general-purpose simulator of quantum algorithms. We apply our method to study random quantum circuits, which are outstanding candidates to demonstrate quantum supremacy on quantum computers that supports nearest-neighbour gate operations on a two-dimensional configuration. Our approach allows to quantify precisely the memory usage and the time requirements of random quantum circuits, thus showing the frontier of quantum supremacy. Applying this general quantum circuit simulator we measured amplitudes for a 7×7 lattice of qubits with depth (1 + 40 + 1) and double-precision numbers in 31 minutes using less than 93 TB memory on the Tianhe-2 supercomputer. Our analytic complexity bounds also show that simulating a 8 × l circuit (l > 8) with depth (1 + 40 + 1), or a 10 × l (l > 10) circuit with depth (1 + 32 + 1) is within reach of current supercomputers. Copyright © 2019, The Authors. All rights reserved.

关键词： Timing circuits

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