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Intelligent Signal Processing and Effective Communication Technologies (INSPECT), IEEE International Conference on

作者： Deepak Upadhyay Kunj Bihari Sharma Mridul Gupta Abhay Upadhyay Nookala Venu Dept. of Computer Science and Engineering Graphic Era Hill University Dehradun India Dept. of Computer Science and Engineering Graphic Era deemed to be University Dehradun India Dept. of Electronics and Communication Engineering Graphic Era deemed to be University Dehradun India Data Science and Quantum Computing ABV Indian Institute of Information Technology and Management Gwalior India

ISBN: (数字)9798350379525

ISBN: (纸本)9798350379532

This paper investigates the secrecy capacity optimization in RF/FSO systems with mixed Rayleigh and log-normal fading, while masking eavesdroppers channel state information () as well as suffering from atmospheric turbulence. We explore the impact of several parameters including beamforming angles, modulation schemes and hybrid RF/FSO link configurations through a combination of simulations as well as analytical models. Secrecy capacity is enhanced for an improved SNR and vice versa under higher turbulence conditions and cooler influents eavesdropped scenarios. Performance of the hybrid RF/FSO systems dominates considerably over single-link solutions, especially at longer distances. All these mechanisms appreciably increase the secrecy capacity, while beamforming and advanced modulation techniques offer most of the improvement. The study also demonstrates the interdependencies of system parameters, providing guidelines for designing secure communication systems under different environmental and operational conditions.

关键词： Heating systems Analytical models Array signal processing Communication systems Atmospheric modeling System performance Modulation Rayleigh channels Optimization Signal to noise ratio

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Security boundaries of an optical-power limiter for protecting quantum-key-distribution systems

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Physical Review Applied 2024年第1期21卷 014026-014026页

作者： Qingquan Peng Binwu Gao Konstantin Zaitsev Dongyang Wang Jiangfang Ding Yingwen Liu Qin Liao Ying Guo Anqi Huang Junjie Wu Institute for Quantum Information and State Key Laboratory of High Performance Computing College of Computer Science and Technology National University of Defense Technology Changsha 410073 China School of Automation Central South University Changsha 410083 China China Greatwall Research Institute China Greatwall Technology Group Co. Ltd. Shenzhen 518057 China Russian Quantum Center Skolkovo Moscow 121205 Russia NTI Center for Quantum Communications National University of Science and Technology MISiS Moscow 119049 Russia Vigo Quantum Communication Center University of Vigo 36310 Vigo Spain Escuela de Ingeniería de Telecomunicación Department of Signal Theory and Communications University of Vigo 36310 Vigo Spain atlanTTic Research Center University of Vigo 36310 Vigo Spain College of Computer Science and Electronic Engineering Hunan University Changsha 410082 China School of Computer Science Beijing University of Posts and Telecommunications Beijing 100876 China

Unauthorized light injection has always been a vital threat to the practical security of a quantum-key-distribution (QKD) system. An optical-power limiter (OPL) based on the thermo-optical defocusing effect has been proposed and implemented, limiting the injected hacking light. As a hardware countermeasure, the performance of the OPL under various light-injection attacks will be tested to clarify the security boundary before it is widely deployed. To investigate the security boundary of the OPL in quantum cryptography, we comprehensively test and analyze the behavior of the OPL under continuous-wave (cw) light-injection attacks and pulse-illumination attacks with pulse repetition rates of 0.5 Hz, 40 MHz, and 1 GHz. The test results illuminate the security boundary of the OPL, which allows one to properly employ the OPL in use cases. The methodology of testing and analysis proposed here is applicable to other power-limitation components in a QKD system.

关键词： Optical quantum information processing Photonics quantum communication quantum cryptography Devices

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Entanglement-enabled advantage for learning a bosonic random displacement channel

arXiv

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arXiv 2024年

作者： Oh, Changhun Chen, Senrui Wong, Yat Zhou, Sisi Huang, Hsin-Yuan Nielsen, Jens A.H. Liu, Zheng-Hao Neergaard-Nielsen, Jonas S. Andersen, Ulrik L. Jiang, Liang Preskill, John Pritzker School of Molecular Engineering The University of Chicago ChicagoIL60637 United States Department of Physics Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Perimeter Institute for Theoretical Physics WaterlooONN2L 2Y5 Canada Institute for Quantum Information and Matter California Institute of Technology PasadenaCA91125 United States Department of Physics and Astronomy Institute for Quantum Computing University of Waterloo ONN2L 2Y5 Canada Center for Theoretical Physics Massachusetts Institute of Technology CambridgeMA02139 United States Google Quantum AI VeniceCA United States Department of Physics Technical University of Denmark Building 307 Fysikvej Kgs Lyngby2800 Denmark

We show that quantum entanglement can provide an exponential advantage in learning properties of a bosonic continuous-variable (CV) system. The task we consider is estimating a probabilistic mixture of displacement operators acting on n bosonic modes, called a random displacement channel. We prove that if the n modes are not entangled with an ancillary quantum memory, then the channel must be sampled a number of times exponential in n in order to estimate its characteristic function to reasonable precision;this lower bound on sample complexity applies even if the channel inputs and measurements performed on channel outputs are chosen adaptively. On the other hand, we present a simple entanglement-assisted scheme that only requires a number of samples independent of n, given a sufficient amount of squeezing. This establishes an exponential separation in sample complexity. We then analyze the effect of photon loss and show that the entanglement-assisted scheme is still significantly more efficient than any lossless entanglement-free scheme under mild experimental conditions. Our work illuminates the role of entanglement in learning continuous-variable systems and points toward experimentally feasible demonstrations of provable entanglement-enabled advantage using CV quantum platforms. Copyright © 2024, The Authors. All rights reserved.

关键词： quantum entanglement

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Computation of relativistic and many-body effects in atomic systems using quantum annealing

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Physical Review A 2024年第4期109卷 042808-042808页

作者： Vikrant Kumar Nishanth Baskaran V. S. Prasannaa K. Sugisaki D. Mukherjee K. G. Dyall B. P. Das Centre for Quantum Engineering Research and Education TCG CREST Salt Lake Kolkata 700091 India Graduate School of Science and Technology Keio University 7-1 Shinkawasaki Saiwai-ku Kawasaki Kanagawa 212-0032 Japan Quantum Computing Center Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama Kanagawa 223-8522 Japan Dirac Solutions 10527 NW Lost Park Drive Portland Oregon 97229 USA Department of Physics Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8550 Japan

We report results for the computation of relativistic effects in quantum many-body systems using quantum annealers. An average accuracy of 98.9% in the fine-structure splitting of boron-like ions with respect to experiments is achieved using the quantum Annealer Eigensolver (QAE) algorithm on the D-Wave Advantage 5000-qubit hardware, which is substantially higher than that attained on a gate-based quantum device to date. We obtain these results in the framework of the many-electron Dirac theory. We implement QAE using a hybrid quantum annealing method that includes an alternative qubit encoding scheme and decomposing the problem into smaller ones based on perturbation theory.

关键词： Atomic & molecular structure Atomic orbital Electron correlation calculations for atoms & ions Fine & hyperfine structure quantum algorithms & computation quantum simulation Relativistic & quantum electrodynamic effects in atoms, molecules,& ions

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Perturbative Diagonalization for Time-Dependent Strong Interactions

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Physical Review Applied 2022年第2期18卷 024009-024009页

作者： Z. Xiao E. Doucet T. Noh L. Ranzani R.W. Simmonds L.C.G. Govia A. Kamal Department of Physics and Applied Physics University of Massachusetts Lowell Massachusetts 01854 USA Associate of the National Institute of Standards and Technology Boulder Colorado 80305 USA Quantum Engineering and Computing Raytheon BBN Technologies Cambridge Massachusetts 02138 USA National Institute of Standards and Technology 325 Broadway Boulder Colorado 80305 USA

We present a systematic method to implement a perturbative Hamiltonian diagonalization based on the time-dependent Schrieffer-Wolff transformation. Applying our method to strong parametric interactions we show how, even in the dispersive regime, full Rabi model physics is essential to describe the dressed spectrum. Our results unveil several qualitatively different results, including realization of large energy-level shifts, tunable in magnitude and sign with the frequency and amplitude of the pump mediating the parametric interaction. Crucially, Bloch-Siegert shifts, typically thought to be important only in the ultrastrong or deep-strong coupling regimes, can be rendered large even for weak dispersive interactions to realize points of exact cancelation of dressed shifts (“blind spots”) at specific pump frequencies. The framework developed here highlights the rich physics accessible with time-dependent interactions and serves to significantly expand the functionalities for control and readout of strongly interacting quantum systems.

关键词： Light-matter interaction Optical quantum information processing quantum electrodynamics quantum optics

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Discrete time crystal phase as a resource for quantum-enhanced sensing

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Physical Review B 2025年第12期111卷 125159-125159页

作者： Rozhin Yousefjani Krzysztof Sacha Abolfazl Bayat Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610051 China Qatar Center for Quantum Computing College of Science and Engineering Hamad Bin Khalifa University Doha Qatar Instytut Fizyki Teoretycznej Wydział Fizyki Astronomii i Informatyki Stosowanej Uniwersytet Jagielloński ulica Profesora Stanisława Łojasiewicza 11 PL-30-348 Kraków Poland Centrum Marka Kaca Uniwersytet Jagielloński ulica Profesora Stanisława Łojasiewicza 11 PL-30-348 Kraków Poland Key Laboratory of Quantum Physics and Photonic Quantum Information Ministry of Education University of Electronic Science and Technology of China Chengdu 611731 China

Discrete time crystals are a special phase of matter in which time translational symmetry is broken through a periodic driving pulse. Here, we first propose and characterize an effective mechanism to generate a stable discrete time crystal phase in a disorder-free many-body system with indefinite persistent oscillations even in finite-size systems. Then we explore the sensing capability of this system to measure the spin exchange coupling. The results show strong quantum-enhanced sensitivity throughout the time crystal phase. As the spin exchange coupling varies, the system goes through a sharp phase transition and enters a non-time-crystal phase in which the performance of the probe considerably decreases. We characterize this phase transition as a second-order type and determine its critical properties through a comprehensive finite-size scaling analysis. The performance is independent of the initial states and may even benefit from imperfections in the driving pulse. A simple set of projective measurements can capture the quantum-enhanced sensitivity.

关键词： Crystal symmetry

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An Integrated Strategy Based on Radiomics and quantum Machine Learning: Diagnosis and Clinical Interpretation of Pulmonary Ground-Glass Nodules

SSRN

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SSRN 2025年

作者： Huang, Xianzhi Xu, Fangyi Zhu, Wenchao Zhao, Wending Yao, Lin He, Jiahuan Su, Junhao Hu, Hongjie Institute for Quantum Technology and Engineering Computing School of JiaYang Zhejiang Shuren University Hangzhou China Department of Radiology Sir Run Run Shaw Hospital Zhejiang University School of Medicine Hangzhou China Medical imaging international scientific and technological cooperation base of Zhejiang province Hangzhou China Quantum Technology Co. Ltd. Beijing China Shulan International Medical College Zhejiang Shuren University Hangzhou China College of Information Science and Technology Zhejiang Shuren University Hangzhou China

Background and Purpose: Accurate classification of pulmonary pure ground-glass nodules (pGGNs) is essentialfor distinguishing invasive adenocarcinoma (IVA) from adenocarcinoma in situ (AIS) and minimally invasive adenocarcinoma (MIA), which significantly influences treatment decisions. This study aims to develop a high-precisionintegrated strategy by combining radiomics-based feature extraction, quantum Machine Learning (QML) models,and SHapley Additive exPlanations (SHAP) analysis to improve diagnostic accuracy and interpretability in *** and methods: A total of 322 pGGNs from 275 patients were retrospectively analyzed. The CT images wasrandomly divided into training and testing cohorts (80:20), with radiomic features extracted from the training *** QML models—quantum Support Vector Classifier (QSVC), Pegasos QSVC, and quantum Neural Network(QNN)—were developed and compared with a classical Support Vector Machine (SVM). SHAP analysis was appliedto interpret the contribution of radiomic features to the models’ ***: All three QML models outperformed the classical SVM, with the QNN model achieving the highest improvements (p © 2025, The Authors. All rights reserved.

关键词： Computerized tomography

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quantum error precompensation for quantum noisy channels

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Physical Review A 2022年第4期106卷 042440-042440页

作者： Chengjie Zhang Liangsheng Li Guodong Lu Haidong Yuan Runyao Duan School of Physical Science and Technology Ningbo University Ningbo 315211 China Science and Technology on Electromagnetic Scattering Laboratory Beijing 100854 China Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Hong Kong Institute for Quantum Computing Baidu Research Beijing 100193 China

Most previous efforts on quantum error correction focused on either extending classical error-correction schemes to the quantum regime by performing a perfect correction on a subset of errors or seeking a recovery operation to maximize the fidelity between an input state and its corresponding output state of a noisy channel. There are few results concerning quantum error precompensation. Here we design an error-precompensated input state for an arbitrary quantum noisy channel and a given target output state. By following a procedure, the required input state, if it exists, can be analytically obtained in single-partite systems. Furthermore, we also present semidefinite programs to numerically obtain the error-precompensated input states with maximal fidelities between the target state and the output state. The numerical results coincide with the analytical results.

关键词： quantum channels quantum control quantum error correction

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Towards practical and massively parallel quantum computing emulation for quantum chemistry

arXiv

引用

arXiv 2023年

作者： Shang, Honghui Fan, Yi Shen, Li Guo, Chu Liu, Jie Duan, Xiaohui Li, Fang Li, Zhenyu Institute of Computing Technology Chinese Academy of Sciences Beijing China Hefei National Laboratory University of Science and Technology of China Hefei230088 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China School of Software Shandong University Jinan China National Research Center of Parallel Computer Engineering and Technology Beijing China

quantum computing is moving beyond its early stage and seeking for commercial applications in chemical and biomedical sciences. In the current noisy intermediate-scale quantum computing era, quantum resource is too scarce to support these explorations. Therefore, it is valuable to emulate quantum computing on classical computers for developing quantum algorithms and validating quantum hardware. However, existing simulators mostly suffer from the memory bottleneck so developing the approaches for large-scale quantum chemistry calculations remains challenging. Here we demonstrate a high-performance and massively parallel variational quantum eigensolver (VQE) simulator based on matrix product states, combined with embedding theory for solving large-scale quantum computing emulation for quantum chemistry on HPC platforms. We apply this method to study the torsional barrier of ethane and the quantification of the protein-ligand interactions. Our largest simulation reaches 1000 qubits, and a performance of 216.9 PFLOPS is achieved on a new Sunway supercomputer, which sets the state-of-the-art for quantum computing emulation for quantum chemistry. © 2023, CC BY.

关键词： Computational chemistry

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Spin Correlations in the Parent Phase of Li1−xFexODFeSe

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Physical Review Letters 2025年第1期134卷 016501-016501页

作者： Hongliang Wo Bingying Pan Die Hu Yu Feng A. D. Christianson Jun Zhao State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China College of Physics and Optoelectronic Engineering Ocean University of China Qingdao Shandong 266100 China Institute of High Energy Physics Chinese Academy of Sciences (CAS) Beijing 100049 China Spallation Neutron Source Science Center Dongguan 523803 China Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Shanghai Research Center for Quantum Sciences Shanghai 201315 China Institute of Nanoelectronics and Quantum Computing Fudan University Shanghai 200433 China

Elucidating spin correlations in the parent compounds of high-temperature superconductors is crucial for understanding superconductivity. We used neutron scattering to study spin correlations in Li1−xFexODFeSe, an insulating material with reduced electron carriers compared to its superconducting counterpart (Tc=41 K), serving as the undoped parent compound. Our findings show a reduced total fluctuating moment in this insulator relative to FeSe and 122 iron pnictides, likely due to increased interlayer distances from intercalation, which enhance fluctuations and reduce the intensity of spin excitations. Moreover, we observed a V-shaped spin wavelike excitation dispersion, contrasting with the twisted hourglass pattern in the superconducting counterpart. Electron doping shifts spin excitation from (π,0) point to an incommensurate position towards (π,π) direction below 65 meV. This transition from V-shaped to hourglasslike dispersion, akin to behaviors in hole-doped cuprates, suggests a potential shared mechanism in magnetism and superconductivity across these diverse systems.

关键词： Neutron scattering

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