npj Quantum Information最新文献

Deterministic steady-state subradiance within a single-excitation basis 在单激励基础上的确定性稳态子辐射

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-10 DOI: 10.1038/s41534-025-01051-8

Meng-Jia Chu, Jun Ren, Z. D. Wang

引用次数: 0

Reply to “Comment to ‘The laws of physics do not prohibit counterfactual communication’ ” 回复“对‘物理定律不禁止反事实的交流’的评论”

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-10 DOI: 10.1038/s41534-025-01043-8

Hatim Salih, Jonte R. Hance, Will McCutcheon, John Rarity

{"title":"Reply to “Comment to ‘The laws of physics do not prohibit counterfactual communication’ ”","authors":"Hatim Salih, Jonte R. Hance, Will McCutcheon, John Rarity","doi":"10.1038/s41534-025-01043-8","DOIUrl":"https://doi.org/10.1038/s41534-025-01043-8","url":null,"abstract":"In his Comment on our recent paper “The laws of physics do not prohibit counterfactual communication”, npj Quantum Information (2022) 8:60, Popescu argues that the claims of the paper are invalid. Here, we refute his argument, showing that it is based on ignoring the specifics of what we set out to prove (that counterfactual communication is possible for post-selected particles, and more specifically in these cases is not prohibited by the weak trace or consistent histories criteria for particle path), followed by an unwarranted simplification of the protocol. Moreover, the Comment’s excursion into interpretation is misplaced. Our communication protocol is a precisely defined one that allows two remote parties, albeit rarely, to communicate an arbitrarily long binary message, with arbitrarily high accuracy. This is not a matter of interpretation—as the concrete example given in our paper in question illustrates. As for our overarching claim that no particles are exchanged in the course of this communication, we have already demonstrated this both theoretically and experimentally, in the postselected case we consider, as per the weak trace and consistent histories criteria for path of a quantum particle.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"47 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

An efficient quantum algorithm for ab initio approximations of non-linear response functions 非线性响应函数从头逼近的有效量子算法

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-09 DOI: 10.1038/s41534-025-01026-9

Tyler Kharazi, Torin F. Stetina, Liwen Ko, Guang Hao Low, K. Birgitta Whaley

{"title":"An efficient quantum algorithm for ab initio approximations of non-linear response functions","authors":"Tyler Kharazi, Torin F. Stetina, Liwen Ko, Guang Hao Low, K. Birgitta Whaley","doi":"10.1038/s41534-025-01026-9","DOIUrl":"https://doi.org/10.1038/s41534-025-01026-9","url":null,"abstract":"We develop and analyze a fault-tolerant quantum algorithm for non-linear response properties of molecular and condensed phase systems. We consider a semi-classical description in which the electronic degrees of freedom are treated quantum mechanically and the light is treated as a classical field interacting via the electric dipole approximation. We use the technique of eigenstate filtering, to efficiently resolve excitation energies for dominant dipole transitions. When applied to the electronic structure Hamiltonian with double factorized representation, each significant spectral line can be approximated to a width of ±γ, and to a height of ±ϵ with (Oleft({N}^{6}{eta }^{2}{gamma }^{-1}{epsilon }^{-1}log (1/epsilon )right)) queries to the block encoding of the unperturbed electronic structure Hamiltonian for η electrons over N basis functions. These quantities can be used to compute the nth order response functions for non-linear spectroscopies under limited assumptions using (widetilde{O}left({N}^{5n+1}{eta }^{n+1}/{gamma }^{n}epsilon right)) queries to the block encoding of the Hamiltonian.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"89 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144252766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

A measurement-device-independent quantum key distribution network using optical frequency comb 基于光频梳的独立于测量设备的量子密钥分配网络

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-09 DOI: 10.1038/s41534-025-01052-7

Wenhan Yan, Xiaodong Zheng, Wenjun Wen, Liangliang Lu, Yifeng Du, Yan-Qing Lu, Shining Zhu, Xiao-Song Ma

引用次数: 0

Lindblad-like quantum tomography for non-Markovian quantum dynamical maps 非马尔可夫量子动态映射的Lindblad-like量子层析成像

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-07 DOI: 10.1038/s41534-025-01044-7

S. Varona, M. Müller, A. Bermudez

{"title":"Lindblad-like quantum tomography for non-Markovian quantum dynamical maps","authors":"S. Varona, M. Müller, A. Bermudez","doi":"10.1038/s41534-025-01044-7","DOIUrl":"https://doi.org/10.1038/s41534-025-01044-7","url":null,"abstract":"We introduce Lindblad-like quantum tomography (LℓQT) as a quantum characterization technique of time-correlated noise in quantum information processors. This approach enables the estimation of time-local master equations, including their possible negative decay rates, by maximizing a likelihood function subject to dynamical constraints. We discuss LℓQT for the dephasing dynamics of single qubits in detail, which allows for a neat understanding of the importance of including multiple snapshots of the quantum evolution in the likelihood function, and how these need to be distributed in time depending on the noise characteristics. By a detailed comparative study employing both frequentist and Bayesian approaches, we assess the accuracy and precision of LℓQT of a dephasing quantum dynamical map that goes beyond the Lindblad limit, focusing on two different microscopic noise models that can be realised in either trapped-ion or superconducting-circuit architectures. We explore the optimization of the distribution of measurement times to minimize the estimation errors, assessing the superiority of each learning scheme conditioned on the degree of non-Markovinity of the noise, and setting the stage for future experimental designs of non-Markovian quantum tomography.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"464 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144236873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Error crafting in mixed quantum gate synthesis 混合量子门合成中的错误加工

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-06 DOI: 10.1038/s41534-025-01032-x

Nobuyuki Yoshioka, Seiseki Akibue, Hayata Morisaki, Kento Tsubouchi, Yasunari Suzuki

引用次数: 0

An invitation to the sample complexity of quantum hypothesis testing 量子假设检验的样本复杂性

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-05 DOI: 10.1038/s41534-025-00980-8

Hao-Chung Cheng, Nilanjana Datta, Nana Liu, Theshani Nuradha, Robert Salzmann, Mark M. Wilde

引用次数: 0

Unveiling quantum phase transitions from traps in variational quantum algorithms 从变分量子算法的陷阱中揭示量子相变

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-04 DOI: 10.1038/s41534-025-01038-5

Chenfeng Cao, Filippo Maria Gambetta, Ashley Montanaro, Raul A. Santos

{"title":"Unveiling quantum phase transitions from traps in variational quantum algorithms","authors":"Chenfeng Cao, Filippo Maria Gambetta, Ashley Montanaro, Raul A. Santos","doi":"10.1038/s41534-025-01038-5","DOIUrl":"https://doi.org/10.1038/s41534-025-01038-5","url":null,"abstract":"Understanding quantum phase transitions in physical systems is fundamental to characterize their behavior at low temperatures. Achieving this requires both accessing good approximations to the ground state and identifying order parameters to distinguish different phases. Addressing these challenges, our work introduces a hybrid algorithm that combines quantum optimization with classical machine learning. This approach leverages the capability of near-term quantum computers to prepare locally trapped states through finite optimization. Specifically, we apply LASSO for identifying conventional phase transitions and the Transformer model for topological transitions, utilizing these with a sliding window scan of Hamiltonian parameters to learn appropriate order parameters and locate critical points. We validated the method with numerical simulations and real-hardware experiments on Rigetti’s Ankaa 9Q-1 quantum computer. This protocol provides a framework for investigating quantum phase transitions with shallow circuits, offering enhanced efficiency and, in some settings, higher precision-thus contributing to the broader effort to integrate near-term quantum computing and machine learning.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"36 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144218688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

A solid-state temporally multiplexed quantum memory array at the single-photon level 一种单光子水平的固态临时多路量子存储阵列

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-04 DOI: 10.1038/s41534-025-01042-9

Markus Teller, Susana Plascencia, Cristina Sastre Jachimska, Samuele Grandi, Hugues de Riedmatten

引用次数: 0

Ultra-high strained diamond spin register with coherent optical control 具有相干光学控制的超高应变金刚石自旋寄存器

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-03 DOI: 10.1038/s41534-025-01049-2

Marco Klotz, Andreas Tangemann, Alexander Kubanek

引用次数: 0