Quantum Science and Technology最新文献

Error-tolerant witnessing of divergences in classical and quantum statistical complexity 经典和量子统计复杂性发散的容错见证

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-06-18 DOI: 10.1088/2058-9565/addfff

Farzad Ghafari, Mile Gu, Joseph Ho, Jayne Thompson, Whei Yeap Suen, Howard M Wiseman and Geoff J Pryde

引用次数: 0

Quantum networks using rare-earth ions 使用稀土离子的量子网络

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-06-15 DOI: 10.1088/2058-9565/addd93

Wolfgang Tittel, Mikael Afzelius, Adam Kinos, Lars Rippe and Andreas Walther

引用次数: 0

Improved amplitude amplification strategies for the quantum simulation of classical transport problems 经典输运问题量子模拟的改进振幅放大策略

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-06-10 DOI: 10.1088/2058-9565/addeea

Alessandro Andrea Zecchi, Claudio Sanavio, Simona Perotto and Sauro Succi

{"title":"Improved amplitude amplification strategies for the quantum simulation of classical transport problems","authors":"Alessandro Andrea Zecchi, Claudio Sanavio, Simona Perotto and Sauro Succi","doi":"10.1088/2058-9565/addeea","DOIUrl":"https://doi.org/10.1088/2058-9565/addeea","url":null,"abstract":"The quantum simulation of classical fluids often involves the use of probabilistic algorithms that encode the result of the dynamics in the form of the amplitude of the selected quantum state. In most cases, however, the amplitude probability is too low to allow an efficient use of these algorithms, thereby hindering the practical viability of the quantum simulation. The oblivious amplitude amplification (OAA) algorithm is often presented as a solution to this problem, but to no avail for most classical problems, since its applicability is limited to unitary dynamics. In this paper, we show analytically that OAA when applied to non-unitary dynamics leads to a distortion of the quantum state and to an accompanying error in the quantum update. We provide an analytical upper bound of such error as a function of the degree of non-unitarity of the dynamics and we test it against a quantum simulation of an advection-diffusion-reaction equation, a transport problem of major relevance in science and engineering. Finally, we also propose an amplification strategy that helps mitigate the distortion error, while still securing an enhanced success probability.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"8 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260452","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

Statistics of topological defects across a phase transition in a digital superconducting quantum processor 数字超导量子处理器中相变拓扑缺陷的统计

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-06-09 DOI: 10.1088/2058-9565/addf75

Oriel Kiss, Daniil Teplitskiy, Michele Grossi and Antonio Mandarino

引用次数: 0

A black-box backdoor attack against quantum neural networks 对量子神经网络的黑盒后门攻击

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-06-09 DOI: 10.1088/2058-9565/addf74

Jiayu Zhao, Lili Yan, Dong Tan, Yan Chang and Shibin Zhang

{"title":"A black-box backdoor attack against quantum neural networks","authors":"Jiayu Zhao, Lili Yan, Dong Tan, Yan Chang and Shibin Zhang","doi":"10.1088/2058-9565/addf74","DOIUrl":"https://doi.org/10.1088/2058-9565/addf74","url":null,"abstract":"Quantum neural networks (QNNs), as a novel model that combines the advantages of quantum computing and classical neural networks, are similarly vulnerable to backdoor attacks like classical neural networks. Current research on backdoor attacks against QNNs is limited by model structure or poisoning rate, resulting in poor attack performance in black-box scenarios. This paper proposes a black-box attack method that uses a quantum-classical hybrid generative model to generate transferable backdoor triggers for QNNs with unknown structures. The method generates universal adversarial perturbations as triggers based on generative models, and designs a QNN pool by utilizing the idea of ensemble models. It combines the min–max framework and non-target Kullback–Leibler divergence technique to improve the transferability of triggers to achieve a black-box attack. Experiments demonstrate that with a poisoning rate of only 5%, the attack success rate exceeds 98% for three different structured QNNs, proving the effectiveness of this backdoor attack. In addition, we also prove that the existing detection methods such as strip and spectral signatures are unable to defend against the backdoor attack proposed in this paper.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"20 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144252028","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

Resource-efficient quantum phase estimation by randomization 基于随机化的资源高效量子相位估计

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-06-08 DOI: 10.1088/2058-9565/addee9

Youle Wang

{"title":"Resource-efficient quantum phase estimation by randomization","authors":"Youle Wang","doi":"10.1088/2058-9565/addee9","DOIUrl":"https://doi.org/10.1088/2058-9565/addee9","url":null,"abstract":"Quantum phase estimation (QPE) is a fundamental tool in quantum computing, facilitating efficient simulations of complex problems in quantum chemistry and materials science. While most phase estimation algorithms are deterministic, recent advancements indicate that incorporating randomness can enhance performance. This study introduces a framework for randomized QPE that merges the benefits of randomized compilation with phase estimation algorithms based on quantum signal processing. Our proposed algorithms effectively reduce circuit depths by eliminating the need for precise Hamiltonian time evolution, making them advantageous for digital quantum computers estimating the eigenvalue and eigenvector properties of Hamiltonians. Notably, our findings show that the quantum stochastic drift protocol (qDRIFT)-based randomized algorithm surpasses the original phase estimation with qDRIFT, especially in scaling inverse failure probabilities. We also establish that a circuit depth of suffices for estimating M distinct observables. The protocol is executed through multiple iterations of the randomized algorithms combined with classical shadow techniques. Overall, our framework retains many advantages of the randomized compilation technique, making it a compelling solution for challenges in quantum chemistry.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"135 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144238213","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

Majorana tensor decomposition: a unifying framework for decompositions of fermionic Hamiltonians to linear combination of unitaries 马约拉纳张量分解：费米子哈密顿分解为酉元线性组合的统一框架

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-06-03 DOI: 10.1088/2058-9565/add9c1

Ignacio Loaiza, Aritra Sankar Brahmachari and Artur F Izmaylov

引用次数: 0

Quantum key distribution with imperfectly isolated devices 不完全隔离设备的量子密钥分发

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-06-01 DOI: 10.1088/2058-9565/addb6e

Xoel Sixto, Álvaro Navarrete, Margarida Pereira, Guillermo Currás-Lorenzo, Kiyoshi Tamaki and Marcos Curty

引用次数: 0

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