npj Quantum Information最新文献_第4页

Layered KIK quantum error mitigation for dynamic circuits 动态电路的分层KIK量子误差缓解

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-03-10 DOI: 10.1038/s41534-026-01207-0

Ben Bar, Jader P. Santos, Raam Uzdin

{"title":"Layered KIK quantum error mitigation for dynamic circuits","authors":"Ben Bar, Jader P. Santos, Raam Uzdin","doi":"10.1038/s41534-026-01207-0","DOIUrl":"https://doi.org/10.1038/s41534-026-01207-0","url":null,"abstract":"Quantum Error Mitigation is essential for enhancing the reliability of quantum computing experiments. The adaptive KIK error mitigation method has demonstrated significant advantages, including resilience to temporal noise drifts, applicability to non-Clifford gates, and guaranteed performance bounds. However, its reliance on global noise amplification introduces limitations, such as incompatibility with mid-circuit measurements and dynamic circuits, as well as small residual errors due to unaccounted high-order Magnus noise terms. In this work, we propose a layer-based noise amplification approach that overcomes these challenges without incurring additional overhead or experimental complexity. Since the Layered KIK method is inherently compatible with mid-circuit measurements, it enables seamless integration with quantum error correction codes. This synergy allows error correction to address dominant noise mechanisms, while the Layered KIK suppresses residual errors arising from leakage and correlated noise sources. Similarly, for reducing sampling costs, Layered KIK can be combined with complementary mitigation methods for providing drift resilience and broadening the range of addressable errors.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"31 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147381707","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

Witness high-dimensional quantum steering via majorization lattice 见证高维量子操纵通过多数化晶格

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-03-09 DOI: 10.1038/s41534-026-01204-3

Ma-Cheng Yang, Cong-Feng Qiao

引用次数: 0

Polychromatic continuous-variable quantum communication network enabled by optical frequency combs 光学频率梳实现的多色连续变量子通信网络

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-03-07 DOI: 10.1038/s41534-026-01211-4

Yuehan Xu, Qijun Zhang, Junpeng Zhang, Xiaojuan Liao, Ziyi Shen, Xu Liu, Beibei Zhang, Zicong Tan, Zehao Zhou, Jisheng Dai, Xueqin Jiang, Peng Huang, Tao Wang, Guihua Zeng

{"title":"Polychromatic continuous-variable quantum communication network enabled by optical frequency combs","authors":"Yuehan Xu, Qijun Zhang, Junpeng Zhang, Xiaojuan Liao, Ziyi Shen, Xu Liu, Beibei Zhang, Zicong Tan, Zehao Zhou, Jisheng Dai, Xueqin Jiang, Peng Huang, Tao Wang, Guihua Zeng","doi":"10.1038/s41534-026-01211-4","DOIUrl":"https://doi.org/10.1038/s41534-026-01211-4","url":null,"abstract":"Polychromatic resources have transformed classical communication networks by boosting rate and scalability; quantum communication networks are reaching a similar inflection point. Here, we report a polychromatic continuous-variable quantum communication network enabled by optical frequency combs. The multi-mode density matrices constituted by polychromatic quantum networks are studied. We incorporate finite mode isolation into the security analysis to bound Eve’s accessible information and compute the total network secret key rate. It is demonstrated that, compared to other multiplexing techniques, polychromatic quantum networks can theoretically achieve a secret key rate without decreasing with the increase in users. In the experiment, direct-transmission type and round-trip type quantum communication networks were built using optical frequency combs and dual-comb interference detection technology. The Gaussian-modulated continuous-variable quantum key distribution (CV-QKD) protocol has been validated, with a network capacity of 19 and a total secret key rate of 8.75 Gbps at a uniform distance of 5 km (asymptotic case), 0.82 Mbps at 120 km (finite-size effect), 89.10 Mbps at 40 km (composable security), 13.66 Mbps at 40 km (composable finite-size security). This implementation not only provides technical support for a high-speed multi-node quantum network, but also provides a solution for the future quantum Internet with continuous variables.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"32 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147371111","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

Overcoming limitations on gate fidelity in noisy static exchange-coupled surface qubits 克服噪声静态交换耦合表面量子比特的门保真度限制

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-03-07 DOI: 10.1038/s41534-026-01214-1

Hoang-Anh Le, Saba Taherpour, Denis Janković, Christoph Wolf

引用次数: 0

Integration of a single photon source with a fibre-compatible photonic waveguide 单光子源与光纤兼容光子波导的集成

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-03-06 DOI: 10.1038/s41534-026-01209-y

Aurélie Broussier, Muhammad H. Muhammad, Nancy Rahbany, Abdelhamid Hmima, Paul Robineau, Cyrille Vezy, Régis Déturche, Antoine Kevorkian, Sylvain Blaize, Christophe Couteau

{"title":"Integration of a single photon source with a fibre-compatible photonic waveguide","authors":"Aurélie Broussier, Muhammad H. Muhammad, Nancy Rahbany, Abdelhamid Hmima, Paul Robineau, Cyrille Vezy, Régis Déturche, Antoine Kevorkian, Sylvain Blaize, Christophe Couteau","doi":"10.1038/s41534-026-01209-y","DOIUrl":"https://doi.org/10.1038/s41534-026-01209-y","url":null,"abstract":"The integration of a single photon source based on a solid-state emitter with a photonic structure remains challenging and specifically when it comes to be compatible with optical fibres. It is important to do so for quantum technologies where single photon sources constitute building blocks for many technologies. In this work, we demonstrate the integration of a single photon source, made of a colloidal semiconductor nanocrystal, with a photonic structure made of a glass waveguide obtained by the ion-exchange technique, which is a fibre-compatible platform used in telecom photonics. Using surface functionalisation and a secondary waveguide of titanium dioxide, we manage to couple single photons from the nanoemitter to the optical waveguide. We observe the single photon character is preserved and demonstrates a 1.2 Purcell factor. A coupling efficiency over 25% is expected thanks to the titanium dioxide secondary waveguiding layer, compared to around 2% obtained for simply positioning the nanocrystal on top of the waveguide alone. The optical waveguide is then pigtailed to an optical fibre to demonstrate a first proof of principle of an integrated single photon source at room temperature with a fibre-compatible platform made of glass with a coupling efficiency increase of 2.8.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"2 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147371127","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

Non-Markovian exceptional points by interpolating quantum channels 插值量子通道的非马尔可夫异常点

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-03-02 DOI: 10.1038/s41534-026-01205-2

Wai Chun Wong, Bei Zeng, Jensen Li

引用次数: 0

Robust quality factor assessment of high-coherence superconducting qubits 高相干超导量子比特的鲁棒质量因子评估

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-02-28 DOI: 10.1038/s41534-026-01199-x

Andrew Dane, Karthik Balakrishnan, Brent Wacaser, Li-Wen Hung, H. J. Mamin, Daniel Rugar, Robert M. Shelby, Conal Murray, Kenneth Rodbell, Jeffrey Sleight

{"title":"Robust quality factor assessment of high-coherence superconducting qubits","authors":"Andrew Dane, Karthik Balakrishnan, Brent Wacaser, Li-Wen Hung, H. J. Mamin, Daniel Rugar, Robert M. Shelby, Conal Murray, Kenneth Rodbell, Jeffrey Sleight","doi":"10.1038/s41534-026-01199-x","DOIUrl":"https://doi.org/10.1038/s41534-026-01199-x","url":null,"abstract":"Large variations in the energy relaxation time (T1) of superconducting qubits make it difficult to accurately evaluate and compare new qubit materials and fabrication processes, or to perform studies that require precise measurements of energy loss. To address this issue, we present techniques for characterizing qubit quality factors by applying electric fields to TLS in the vicinity of qubits. Introducing low-frequency (<1 Hz) AC fields allows us to stabilize the measured T1 by averaging over the accessible TLS configurations, producing a robust estimate of T1 that is difficult to replicate with hundreds of measurements over long periods, without applied fields. In a complementary technique, we apply a randomly selected DC field to the qubit and measure T1. Repeated ‘fast-random’ measurements reveal a distribution of T1 values whose harmonic mean is consistent with that obtained through AC measurements but illustrates a wider range of qubit lifetimes induced by TLS interactions. We implement these TLS control techniques in various ways, including demonstrating a simple T1 improvement protocol and precise measurements of T1 vs temperature. These techniques will facilitate our understanding of how to improve qubit coherence by enabling better measurements in shorter times or with fewer devices.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"23 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147320069","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

The Lie algebra of XY-mixer topologies and warm starting QAOA for constrained optimization XY-mixer拓扑的李代数及约束优化的热启动QAOA

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-02-27 DOI: 10.1038/s41534-026-01192-4

Steven Kordonowy, Hannes Leipold

引用次数: 0

Superior frequency stability and long-lived state-swapping in cubic-SiC mechanical mode pairs 优异的频率稳定性和长寿命的三次sic机械模态对的状态交换

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-02-26 DOI: 10.1038/s41534-026-01200-7

Huanying Sun, Yanlin Chen, Qichun Liu, Haihua Wu, Yuqing Wang, Tiefu Li, Yulong Liu

{"title":"Superior frequency stability and long-lived state-swapping in cubic-SiC mechanical mode pairs","authors":"Huanying Sun, Yanlin Chen, Qichun Liu, Haihua Wu, Yuqing Wang, Tiefu Li, Yulong Liu","doi":"10.1038/s41534-026-01200-7","DOIUrl":"https://doi.org/10.1038/s41534-026-01200-7","url":null,"abstract":"The multimode cavity optomechanical system offers versatile applications, including state transduction, coherent interconnection, and many-body simulations. In this work, we establish a high-quality-factor 3C-SiC membrane resonator as a versatile platform for multimode cavity optomechanics, demonstrating its capabilities from precise stress characterization to coherent quantum operations. We first perform a collective fit of the measured frequencies of 57 mechanical modes to a theoretical expression that incorporates nonuniform in-plane stress. This analysis reveals a biaxial stress difference on the order of MPa and demonstrates the remarkable resolution of this method for stress analysis in thin films. Subsequently, the membrane is integrated with a rectangular superconducting cavity to form an electromechanical system, enabling the investigation of frequency stability in degeneracy-broken mechanical mode pairs. These modes exhibit exceptional quality factors up to 108 at 10 mK. Furthermore, Allan deviation indicates that these modes exhibit extremely stable frequencies compared with different types of optomechanical devices. Finally, we demonstrate a state-swapping between near-degenerate mode pairs, demonstrating the transfer efficiency exceeding 78%, attributed to their exceptionally long lifetimes. This study paves the way for the design of compact quantum phononic devices featuring high-quality-factor mechanical multimodes.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"49 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147320070","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

Towards telecom-compatible quantum nodes using erbium-doped stoichiometric EuCl3 ⋅ 6H2O crystals 利用掺铒EuCl3⋅6H2O晶体实现电信兼容量子节点

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-02-25 DOI: 10.1038/s41534-026-01203-4

Mucheng Guo, Wanting Xiao, Zongfeng Li, Weiye Sun, Matthew J. Sellars, Rose L. Ahlefeldt, Ping Wang, Shuping Liu, Fudong Wang, Manjin Zhong

引用次数: 0