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A Bayesian validation approach to practical boson sampling

Science China(Physics,Mechanics & Astronomy) 2020年第5期63卷 39-46页

作者： Zhe Dai Yong Liu Ping Xu WeiXia Xu XueJun Yang JunJie Wu Institute for Quantum Information&State Key Laboratory of High Performance Computing College of Computer National University of Defense TechnologyChangsha 410073China

Boson sampling is a promising candidate for demonstrating quantum supremacy. The validation that involves judging whether a quantum setup outputs photons following the boson sampling model is an essential task in the experiments. However, the current validation methods may result in an incorrect conclusion being reached in realistic experiments, in which no ideally identical photons exist. Accordingly, this study proposes a slope-based approach, which is an extended Bayesian validation, to model the degree of photon indistinguishability. Through numerical simulations and performance evaluations, we demonstrate that the proposed approach can correctly validate boson sampling against the distribution of classical particles. In addition to offering a useful approach for validation, our research indicates that physicists should pay more attention to the quality of photon indistinguishability in boson sampling experiments.

关键词： boson sampling quantum supremacy Bayesian validation photon indistinguishability

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OL-CBBA: An Online Task Allocation Algorithm under Weak Communication Conditions

OL-CBBA: An Online Task Allocation Algorithm under Weak Comm...

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International Conference on Parallel and Distributed Systems (ICPADS)

作者： Jun Li Wanrong Huang Honglin Wu Zhongxuan Cai Yongjun Zhang Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer Science and Technology National University of Defense Technology Changsha China

Multiple unmanned aerial vehicles (UAVs) and multiple tasks allocation problem is difficult to solve. Existing task allocation algorithms assume that the UAVs’ position is static, and cannot assign tasks with the changing UAVs’ position simultaneously during task execution. Those algorithms reduce the efficiency of task allocation. In this paper, we propose an online consensus-based bundle algorithm (OL-CBBA) under weak communication for dynamic task allocation. We consider the situation that the location information of UAVs will constantly change during the dynamic execution of tasks. The algorithm first improves the static CBBA to an online algorithm by updating the task marginal score in task path. Moreover, we specify a flag for the convergence of individual tasks, allowing UAVs to start executing tasks earlier. Extensive comparative experiments prove the highly consistent efficiency of OL-CBBA under weak communication conditions. Specifically, the proposed OL-CBBA attains up to 22% improvement compared with CBBA.

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Integrating Velox into TinkerPop for Graph Queries on Vectorized Engine

Integrating Velox into TinkerPop for Graph Queries on Vector...

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Electronic Information Engineering and Computer Technology (EIECT), International Conference on

作者： Zihao Li Liyang Xu Ruochun Jin Huan Chen Yuhua Tang Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer Science and Technology National University of Defense Technology Changsha China

To enhance the query efficiency of relational databases and build a unified computing backend, Meta has developed Velox, a vectorized execution engine library based on columnar storage, Currently, there is no standardized specification for computation engine, and storage in graph databases, leading to failed to effectively utilize the vectorized processing capability of modern CPU. In this paper, we propose a middleware that primarily focuses on (1) non-invasively integrating Velox into the TinkerPop framework to provide unified vectorized engine acceleration for all graph databases supporting the TinkerPop specification; (2) conducting graph queries based on the relational data storage model, eliminating the overhead of transforming the storage model into a graph storage model; (3) validating the acceleration effect of the vectorized engine on interactive workload of graph queries under a single-node environment.

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Generation and optimization of entanglement between atoms chirally coupled to spin cavities

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Physical Review Research 2025年第1期7卷 L012058-L012058页

作者： Jia-Bin You Jian Feng Kong Davit Aghamalyan Wai-Keong Mok Kian Hwee Lim Jun Ye Ching Eng Png Francisco J. García-Vidal Institute of High Performance Computing (IHPC) Agency for Science Technology and Research (ASTAR) 1 Fusionopolis Way No. 16-16 Connexis Singapore 138632 Singapore Quantum Innovation Centre (Q.InC) Agency for Science Technology and Research (ASTAR) 2 Fusionopolis Way No. 08-03 Innovis Singapore 138634 Singapore Institute for Quantum Information and Matter California Institute of Technology Pasadena California 91125 USA Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore 117543 Singapore Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC) Universidad Autónoma de Madrid E-28049 Madrid Spain

We explore the generation and optimization of entanglement between atoms chirally coupled to finite one-dimensional spin chains, functioning as spin cavities. By diagonalizing the spin cavity Hamiltonian, we identify a parity effect that influences entanglement, with small even-sized cavities chirally coupled to atoms expediting entanglement generation by approximately 50% faster than nonchiral coupling. Applying a classical driving field to the atoms reveals oscillations in concurrence, with resonant dips at specific driving strengths due to the resonances between the driven atom and the spin cavity. Extending our study to systems with energetic disorder, we find that high concurrence can be achieved regardless of disorder strength when the inverse participation ratio of the resulting eigenstates is favorable. Finally, we demonstrate that controlled disorder within the cavity significantly enhances and expedites entanglement generation, achieving higher concurrences up to four times faster than those attained in ordered systems.

关键词： Atoms

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A thermal conductivity switch via the reversible 2H–1T′phase transition in monolayer MoTe_(2)

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Chinese Physics B 2023年第5期32卷 1-6页

作者：张定波任卫君王珂陈帅张力发倪宇翔张刚 School of Physical Science and Technology Southwest Jiaotong UniversityChengdu 610031China Institute of High Performance Computing A*STAR 138632Singapore Center for Phononics and Thermal Energy Science China-EU Joint Laboratory for NanophononicsSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China School of Automation Xi’an University of Posts and TelecommunicationsShaanxi 710121China NNU-SULI Thermal Energy Research Center and Center for Quantum Transport and Thermal Energy Science(CQTES)School of Physics and TechnologyNanjing Normal UniversityNanjing 210023China

The two-dimensional(2D)material-based thermal switch is attracting attention due to its novel applications,such as energy conversion and thermal management,in nanoscale *** this paper,we observed that the reversible 2H–1T′phase transition in MoTe_(2)is associated with about a fourfold/tenfold change in thermal conductivity along the X/Y direction by using first-principles *** phenomenon can be profoundly understood by comparing the Mo–Te bonding strength between the two *** 2H-MoTe_(2)has one stronger bonding type,while 1T′-MoTe_(2)has three weaker types of bonds,suggesting bonding inhomogeneity in 1T′-MoTe_(2).Meanwhile,the bonding inhomogeneity can induce more scattering of vibration *** weaker bonding indicates a softer structure,resulting in lower phonon group velocity,a shorter phonon relaxation lifetime and larger Gr¨uneisen *** impact caused by the 2H to 1T′phase transition in MoTe_(2)hinders the propagation of phonons,thereby reducing thermal *** study describes the possibility for the provision of the MoTe_(2)-based controllable and reversible thermal switch device.

关键词： thermal switch MoTe_(2) phase transition thermal conductivity mechanism

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TOWARDS RADAR EMITTER RECOGNITION IN CHANGING ENVIRONMENTS WITH DOMAIN GENERALIZATION

arXiv

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arXiv 2023年

作者： Wu, Honglin Li, Xueqiong Lan, Long Xu, Liyang Tang, Yuhua Institute for Quantum Information State Key Laboratory of High Performance Computing College of Computer Science and Technology National University of Defense Technology Changsha China

Analyzing radar signals from complex Electronic Warfare (EW) environment is a non-trivial task. However, in the real world, the changing EW environment results in inconsistent signal distribution, such as the pulse repetition interval (PRI) mismatch between different detected scenes. In this paper, we propose a novel domain generalization framework to improve the adaptability of signal recognition in changing environments. Specifically, we first design several noise generators to simulate varied scenes. Different from conventional augmentation methods, our introduced generators carefully enhance the diversity of the detected signals and meanwhile maintain the semantic features of the signals. Moreover, we propose a signal scene domain classifier that works in the manner of adversarial learning. The proposed classifier guarantees the signal predictor to generalize to different scenes. Extensive comparative experiments prove the proposed method’s superiority. Copyright © 2023, The Authors. All rights reserved.

关键词： Electronic warfare

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Experimental quantum natural gradient optimization in photonics

arXiv

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arXiv 2023年

作者： Wang, Yizhi Xue, Shichuan Wang, Yaxuan Ding, Jiangfang Shi, Weixu Wang, Dongyang Liu, Yong Liu, Yingwen Fu, Xiang Huang, Guangyao Huang, Anqi Deng, Mingtang Wu, Junjie Institute for Quantum Information State Key Laboratory of High Performance Computing College of Computer Science and Technology National University of Defense Technology Changsha410073 China

Variational quantum algorithms (VQAs) combining the advantages of parameterized quantum circuits and classical optimizers, promise practical quantum applications in the Noisy Intermediate-Scale quantum era. The performance of VQAs heavily depends on the optimization method. Compared with gradient-free and ordinary gradient descent methods, the quantum natural gradient (QNG), which mirrors the geometric structure of the parameter space, can achieve faster convergence and avoid local minima more easily, thereby reducing the cost of circuit executions. We utilized a fully programmable photonic chip to experimentally estimate the QNG in photonics for the first time. We obtained the dissociation curve of the He-H+ cation and achieved chemical accuracy, verifying the outperformance of QNG optimization on a photonic device. Our work opens up a vista of utilizing QNG in photonics to implement practical near-term quantum applications. © 2023, CC BY.

关键词： Photonic devices

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quantum generative adversarial learning in photonics

arXiv

引用

arXiv 2023年

作者： Wang, Yizhi Xue, Shichuan Wang, Yaxuan Liu, Yong Ding, Jiangfang Shi, Weixu Wang, Dongyang Liu, Yingwen Fu, Xiang Huang, Guangyao Huang, Anqi Deng, Mingtang Wu, Junjie Institute for Quantum Information State Key Laboratory of High Performance Computing College of Computer Science and Technology National University of Defense Technology Changsha410073 China

quantum Generative Adversarial Networks (QGANs), an intersection of quantum computing and machine learning, have attracted widespread attention due to their potential advantages over classical analogs. However, in the current era of Noisy Intermediate-Scale quantum (NISQ) computing, it is essential to investigate whether QGANs can perform learning tasks on near-term quantum devices usually affected by noise and even defects. In this Letter, using a programmable silicon quantum photonic chip, we experimentally demonstrate the QGAN model in photonics for the first time, and investigate the effects of noise and defects on its performance. Our results show that QGANs can generate high-quality quantum data with a fidelity higher than 90%, even under conditions where up to half of the generator’s phase shifters are damaged, or all of the generator and discriminator’s phase shifters are subjected to phase noise up to 0.04π. Our work sheds light on the feasibility of implementing QGANs on NISQ-era quantum hardware. © 2023, CC BY.

关键词： Phase shifters

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A New Method for Evaluating Core Developers In Open Source Software 13

A New Method for Evaluating Core Developers In Open Source S...

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13th IEEE International Conference on Software Engineering and Service Science, ICSESS 2022

作者： Song, Yulin Wang, Tao Shen, Yang Chang, Junsheng National University of Defense Technology National Laboratory for Parallel and Distributed Processing Hunan Province Changsha China National University of Defense Technology Institute for Quantum Information State Key Laboratory of High Performance Computing Hunan Province Changsha China

ISBN: (数字)9781665410328

ISBN: (纸本)9781665410311

The high-quality development of Open Source Software(OSS) benefits from the contributions of developers. An important research question is how to truly assess the extent of contribution of all developers in open source software and effectively identify the core developers to avoid their loss. In this paper, we use the undirected weighted network model to build a Developer Collaboration Network(DCN) based on developers and their contributions to the GitHub community's open source software Rails, analyse the characteristics of developer partnerships through the Developer Collaboration Network, and propose a Developer Personal Impact Factor(DPIF) to evaluate the importance of developer, select the top 10 core developers in Rails, focus on their participation in the open source software process, and predicting the changes of their contributions. The experimental results show that core developers with extensive partnerships are more likely to associate with developers with fewer partnerships. The average degree of developer contribution does not increase with more developers. Developer partnerships are characterized by close localization and loose overall relationships. The Developer Personal Impact Factor identifies the core developers in open source software well. The Developer Personal Impact Factor gives a ranking in which the core team members rank in the top 1.17% on average. © 2022 IEEE.

关键词： Open source software

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Radio Modulation Recognition Based on Attention-based Convolutional Neural Network and Time-frequency Analysis 2

Radio Modulation Recognition Based on Attention-based Convol...

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2nd International Seminar on Artificial Intelligence, Networking and Information Technology, AINIT 2021

作者： Li, Xinlong Huang, Da Yang, Wenjing Li, Xueqiong Institute for Quantum Information and State Key Laboratory of High Performance Computing College of Computer Science and Technology National University of Defense Technology Changsha China

ISBN: (纸本)9781665412964

Radio modulation recognition is the key link of modern electronic warfare. This paper applies the idea of deep learning to radio modulation recognition. Since the modulation type is the most important information about the subtle features of the radio signal, we use short time Fourier transform (STFT) to convert the radio signal into a time-frequency distribution map to form a joint distribution of frequency and time. The attention-based convolutional neural network is used to classify and recognize the modulation types of time-frequency distribution maps. The simulation results show that time-frequency analysis can improve the accuracy of recognition, and adding attention can effectively improve the performance of the network. © 2021 IEEE.

关键词： Convolutional neural networks

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