Quantum Science and Technology最新文献

Efficient conversion from fermionic Gaussian states to matrix product states 从费米子高斯态到矩阵积态的有效转换

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-05-28 DOI: 10.1088/2058-9565/addae0

Tong Liu, Ying-Hai Wu, Hong-Hao Tu and Tao Xiang

{"title":"Efficient conversion from fermionic Gaussian states to matrix product states","authors":"Tong Liu, Ying-Hai Wu, Hong-Hao Tu and Tao Xiang","doi":"10.1088/2058-9565/addae0","DOIUrl":"https://doi.org/10.1088/2058-9565/addae0","url":null,"abstract":"Fermionic Gaussian states (FGSs) are eigenstates of quadratic Hamiltonians and widely used in quantum many-body problems. We propose a highly efficient algorithm that converts FGSs to matrix product states (MPSs). It can be formulated for finite-size systems without translation invariance, but becomes particularly appealing when applied to infinite systems with translation invariance. If the ground states of a topologically ordered system on infinite cylinders are expressed as MPSs, then the fixed points of the transfer matrix can be harnessed to filter out the anyon eigenbasis, also known as minimally entangled states. This allows for efficient computation of universal properties such as entanglement spectrum and modular matrices. The potential of our method is demonstrated by numerical calculations in two chiral spin liquids that have the same topological orders as the bosonic Laughlin and Moore–Read states, respectively. The anyon eigenbasis for the first one has been worked out before and serves as a useful benchmark. The anyon eigenbasis of the second one is, however, not transparent and its successful construction provides a nontrivial corroboration of our method.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"5 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144165268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Entanglement-informed construction of variational quantum circuits 变分量子电路的纠缠信息构造

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-05-28 DOI: 10.1088/2058-9565/addb6f

Alina Joch, Götz S Uhrig and Benedikt Fauseweh

引用次数: 0

Numerical security analysis for quantum key distribution with partial state characterization 具有部分状态表征的量子密钥分发的数值安全性分析

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-05-27 DOI: 10.1088/2058-9565/addae1

Guillermo Currás-Lorenzo, Álvaro Navarrete, Javier Núñez-Bon, Margarida Pereira and Marcos Curty

引用次数: 0

Benchmarking digital–analog quantum computation for the inhomogeneous two-body Ising model 非齐次二体Ising模型的数模量子计算基准

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-05-26 DOI: 10.1088/2058-9565/add8b6

Vicente Pina Canelles, Manuel G Algaba, Hermanni Heimonen, Miha Papič, Mario Ponce, Jami Rönkkö, Manish J Thapa, Inés de Vega and Adrian Auer

{"title":"Benchmarking digital–analog quantum computation for the inhomogeneous two-body Ising model","authors":"Vicente Pina Canelles, Manuel G Algaba, Hermanni Heimonen, Miha Papič, Mario Ponce, Jami Rönkkö, Manish J Thapa, Inés de Vega and Adrian Auer","doi":"10.1088/2058-9565/add8b6","DOIUrl":"https://doi.org/10.1088/2058-9565/add8b6","url":null,"abstract":"Digital–analog quantum computation (DAQC) has recently been proposed as an alternative to the standard paradigm of digital quantum computation (DQC). DAQC generates entanglement through a continuous or analog evolution of the whole device, rather than by applying two-qubit gates. This manuscript describes an in-depth analysis of errors in DAQC implementing Ising Hamiltonians used for arbitrary computations, which was missing from the previous literature, revealing that, overall, DAQC errors scale less favorably compared to those in DQC. As demonstrated, for an all-to-all connectivity, the leading error source for DAQC scales like , while for the digital case, it scales like for implementing an arbitrary Hamiltonian evolution. We further illustrate this result with our own simulations of the Quantum Fourier Transform, which in the previous literature were based on unrealistic parameter choices, biasing the result in favor of DAQC, and were limited to system sizes of up to only seven qubits. On the other hand, we develop a specific DAQC protocol for a star connectivity, which shows an advantage for the particular case of a GHZ state generation protocol.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"10 1","pages":"035029"},"PeriodicalIF":6.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AI and quantum computing ethics- same but different? Towards a new sub-field of computing ethics 人工智能和量子计算伦理——相同但不同？迈向计算伦理学的新分支领域

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-05-26 DOI: 10.1088/2058-9565/add9c2

R Coates, D Douglas and M Per

{"title":"AI and quantum computing ethics- same but different? Towards a new sub-field of computing ethics","authors":"R Coates, D Douglas and M Per","doi":"10.1088/2058-9565/add9c2","DOIUrl":"https://doi.org/10.1088/2058-9565/add9c2","url":null,"abstract":"As quantum computing development advances closer toward achieving fault-tolerant error-corrected realisation, debates on applications, impacts, risks, and benefits of quantum computing are timely and due. While there is awareness of the potential power and complexity of quantum computers, there has been relatively little attention on the social impacts and ethical implications of this technology. In grappling with the social impacts of quantum computing, some stakeholders have turned to applied ethics, specifically (classical) computer and Artificial Intelligence (AI) ethics, for guidance. While computer and AI ethics are useful starting points for evaluating the ethical issues posed by quantum computing, uncritically applying existing sets of ethical principles risks overlooking how quantum computing differs from these technologies. We argue that borrowing of ethical principles and guidelines from AI and computing is inappropriate for several reasons: (1) quantum computing, classical computing, and AI are different technologies with significant material differences; (2) unlike AI and classical computers which have become established, quantum computing is an emerging technology, which has implications on the levels of accessibility and immediate impact in society; and (3) there are significant differences in the way AI and quantum computing have been developed and by whom. We also briefly summarise some of the unique risks and societ al impacts posed by quantum computing. We posit that these reasons support the argument for a new sub-field of quantum computing ethics, which would allow a relevant scholarship to develop and provide guidance as quantum computing technology continues to mature.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"57 1","pages":"035030"},"PeriodicalIF":6.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Selective and noise-resilient wave estimation with quantum sensor networks 量子传感器网络的选择性和抗噪声波估计

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-05-22 DOI: 10.1088/2058-9565/add61b

Arne Hamann, Paul Aigner, Wolfgang Dür and Pavel Sekatski

引用次数: 0

A flexible SoC for quantum key distribution post-processing based on RISC-V processor 一种基于RISC-V处理器的量子密钥分发后处理灵活SoC

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-05-21 DOI: 10.1088/2058-9565/add801

Xinyi Wu, Lianye Liao, Xiaodong Fan, Ye Chen, Jinquan Huang, Minjie Liu, Zhiyu Tian, Tonglin Mu, Junran Guo, Bo Liu and Shihai Sun

{"title":"A flexible SoC for quantum key distribution post-processing based on RISC-V processor","authors":"Xinyi Wu, Lianye Liao, Xiaodong Fan, Ye Chen, Jinquan Huang, Minjie Liu, Zhiyu Tian, Tonglin Mu, Junran Guo, Bo Liu and Shihai Sun","doi":"10.1088/2058-9565/add801","DOIUrl":"https://doi.org/10.1088/2058-9565/add801","url":null,"abstract":"In the domain of quantum-secure communications, post-processing emerges as a critical mechanism to ensure the security and integrity of the generated keys generated by quantum key distribution (QKD). However, existing post-processing frameworks often lack universality, being highly tailored to single-algorithm implementations and frequently neglecting key aspects such as system scalability and integration. To address these limitations, we present a novel system-on-chip (SoC) architecture for QKD post-processing, built around a co-designed framework featuring a RISC-V soft-core processor. This architecture incorporates core functionalities essential to QKD post-processing, including privacy amplification, information reconciliation, and high-speed communication interfaces. By leveraging the flexibility of the open-source RISC-V instruction set, the system achieves enhanced adaptability and energy efficiency. Additionally, a separated-bus architecture is employed, decoupling data and instruction buses to optimize data transfer efficiency and overall system performance, paving the way for scalable and high-throughput quantum communication systems. The system is deployed on the Xilinx Kintex Ultrascale series development board. At the Bob side, with a frame length of 16 384, the information reconciliation module and the privacy amplification module achieves throughputs of 29.73 Mbps and 131.07 Mbps, respectively.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"153 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Universal programmable waveguide arrays 通用可编程波导阵列

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-05-21 DOI: 10.1088/2058-9565/add802

Akram Youssry and Alberto Peruzzo

{"title":"Universal programmable waveguide arrays","authors":"Akram Youssry and Alberto Peruzzo","doi":"10.1088/2058-9565/add802","DOIUrl":"https://doi.org/10.1088/2058-9565/add802","url":null,"abstract":"Implementing arbitrary unitary transformations is crucial for applications in quantum computing, signal processing, and machine learning. Unitaries govern quantum state evolution, enabling reversible transformations critical in quantum tasks like cryptography and simulation and playing key roles in classical domains such as dimensionality reduction and signal compression. Integrated optical waveguide arrays have emerged as a promising platform for these transformations, offering scalability for both quantum and classical systems. However, scalable and efficient methods for implementing arbitrary unitaries remain challenging. Here, we present a theoretical framework for realizing arbitrary unitary matrices through programmable waveguide arrays (PWAs). We provide a mathematical proof demonstrating that cascaded PWAs can implement any unitary matrix within practical constraints, along with a numerical optimization method for customized PWA designs. Our results establish PWAs as a universal and scalable architecture for quantum photonic computing, effectively bridging quantum and classical applications, and positioning PWAs as an enabling technology for advancements in quantum simulation, machine learning, secure communication, and signal processing.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"42 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Motion-insensitive time-optimal control of optical qubits 光量子比特的运动不敏感时间最优控制

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-05-20 DOI: 10.1088/2058-9565/add61c

Léo Van Damme, Zhao Zhang, Amit Devra, Steffen J Glaser and Andrea Alberti

引用次数: 0

Rapid charging of a two-qubit quantum battery by transverse field amplitude and phase control 利用横向场振幅和相位控制实现双量子位量子电池的快速充电

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-05-19 DOI: 10.1088/2058-9565/add207

Vasileios Evangelakos, Emmanuel Paspalakis and Dionisis Stefanatos

{"title":"Rapid charging of a two-qubit quantum battery by transverse field amplitude and phase control","authors":"Vasileios Evangelakos, Emmanuel Paspalakis and Dionisis Stefanatos","doi":"10.1088/2058-9565/add207","DOIUrl":"https://doi.org/10.1088/2058-9565/add207","url":null,"abstract":"We consider a quantum battery (QB) composed of a pair of qubits coupled with an Ising interaction in the usual NMR framework, where the longitudinal applied field is constant and the time-dependent variables controlling the system are the amplitude and phase of the transverse field, and use optimal control to derive fast charging protocols. We study both the cases where the Ising coupling is weaker and stronger than the longitudinal field. In the first case, where the lowest-energy state of the system is the spin-down state, the optimal charging protocol stipulates the transverse field amplitude to be constant and equal to its maximum allowed value, while the minimum time for full charging of the battery tends to zero as this maximum bound increases. In the second case, where the lowest-energy state is a maximally entangled Bell state, the optimal charging protocol includes a time interval where the transverse field amplitude is zero and its phase is immaterial, corresponding to singular control. In this case, the QB can be charged with higher levels of stored energy, while the minimum time for full charging tends to a nonzero limit proportional to the inverse Ising interaction, as the maximum bound of the control amplitude increases. We analyze intuitively and quantitatively the distinct behavior of the two cases and additionally use the dynamical Lie algebra of the system to elucidate the presence of a singular arc in the optimal pulse-sequence in the second case. The discovered interplay between the QB parameters, the stored energy and the minimum time for full charging, provides great flexibility for optimizing the performance of the device according to the operating constraints. The valuable insights gained regarding the design of QBs is expected to find immediate applications in modern quantum science and technology, while we aim to extend the proposed methods to larger spin chains.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"33 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144097663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0