npj Quantum Information最新文献_第3页

Beyond Robertson–Schrödinger: a general uncertainty relation unveiling hidden noncommutative trade-offs 超越Robertson-Schrödinger：揭示隐藏的非交换权衡的一般不确定性关系

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-09-21 DOI: 10.1038/s41534-026-01374-0

Gen Kimura,Aina Mayumi,Hiromichi Ohno,Jaeha Lee,Dariusz Chruściński

引用次数: 0

Superfluid helium thin films as quantum field theory simulators for probing information area laws 超流氦薄膜作为探测信息区域定律的量子场论模拟器

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-09-15 DOI: 10.1038/s41534-026-01367-z

Maciej T. Jarema, Cameron R. D. Bunney, Vitor S. Barroso, Mohammadamin Tajik, Chris Goodwin, Silke Weinfurtner

{"title":"Superfluid helium thin films as quantum field theory simulators for probing information area laws","authors":"Maciej T. Jarema, Cameron R. D. Bunney, Vitor S. Barroso, Mohammadamin Tajik, Chris Goodwin, Silke Weinfurtner","doi":"10.1038/s41534-026-01367-z","DOIUrl":"https://doi.org/10.1038/s41534-026-01367-z","url":null,"abstract":"Information-theoretic measures, such as entropy and mutual information, provide a comprehensive tool for characterising quantum correlations. They reveal foundational features across quantum many-body systems, quantum field theory (QFT), and even black hole thermodynamics. A striking example is the emergence of area laws, occurring when correlations are constrained to local regions, causing information to scale with boundary area, rather than volume. Whilst area laws have been experimentally observed in discrete quantum systems, they remain under-explored in continuous quantum fields owing to the lack of implementable measurement techniques in these settings. Here, we propose using phononic excitations (third sound) on thin-film superfluid helium as a (2 + 1)-dimensional quantum field simulator. In light of recent advances in high-resolution detection schemes, this platform now offers experimental access to the spatially and temporally resolved effective field. We develop a framework to utilise experimentally accessible observables to reconstruct the covariance matrix and evaluate distributions of mutual information. Our numerical predictions confirm area-law behaviour with characteristic deviations due to effects of confinement. Finally, we outline a clear pathway towards experimental implementation of our proposal considering state-of-the-art imaging and cryogenic technologies.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"32 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149010560","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

Quantum Coulomb drag signatures of Majorana bound states 马约拉纳束缚态的量子库仑阻力特征

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-09-15 DOI: 10.1038/s41534-026-01307-x

Zi-Wei Li, Jiaojiao Chen, Wei Xiong, Xiao Xue, Zeng-Zhao Li

{"title":"Quantum Coulomb drag signatures of Majorana bound states","authors":"Zi-Wei Li, Jiaojiao Chen, Wei Xiong, Xiao Xue, Zeng-Zhao Li","doi":"10.1038/s41534-026-01307-x","DOIUrl":"https://doi.org/10.1038/s41534-026-01307-x","url":null,"abstract":"Majorana bound states (MBSs), with their non-Abelian statistics and topological protection, are key candidates for fault-tolerant quantum computation. However, their unambiguous identification in solid-state systems remains a fundamental challenge. Here, we present a theoretical study demonstrating that drag transport in a capacitively coupled double quantum dot system offers a robust and nonlocal probe of weakly coupled MBSs. Using the master equation approach, we investigate both steady-state and transient dynamics and uncover a distinctive signature of MBSs, namely the emergence of pronounced split peaks in the drag transconductance, directly linked to inter-MBS coupling. We further show that the dynamics of quantum coherence is correlated with the emergence and enhancement of MBS-induced split peaks in the drag transconductance. A comparative analysis with normal (non-superconducting) bound states reveals key differences, that is, MBS-induced transconductance peaks are symmetric and exhibit characteristic splitting, while normal-state features are generally asymmetric and lack such robust splitting behavior. These findings establish experimentally accessible criteria for distinguishing MBSs from normal (non-superconducting) bound states and provide a practical framework for probing Majorana physics through nonlocal transport.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"1 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149010561","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

Criteria for unbiased estimation: applications to noise-agnostic sensing and quantum channel estimation 无偏估计准则：在噪声不可知传感和量子信道估计中的应用

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-09-14 DOI: 10.1038/s41534-026-01347-3

Hyukgun Kwon, Kento Tsubouchi, Chia-Tung Chu, Liang Jiang

引用次数: 0

Satellite-to-ground quantum key distribution model under time-evolving turbulence 时变湍流下星地量子密钥分布模型

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-09-09 DOI: 10.1038/s41534-026-01363-3

Hai-Yang Fu,Fang-Xiang Wang,Shuang Wang,Zhen-Qiang Yin,Wei Chen,Zheng-Fu Han

引用次数: 0

Security risks of VOA-induced luminescence in chip-based quantum key distribution 基于芯片的量子密钥分发中voa致发光的安全风险

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-09-09 DOI: 10.1038/s41534-026-01365-1

Zijian Li,Chenyu Xu,Xin Hua,Yongqiang Du,Xin Liu,Tao Lin,Xi Xiao,Kejin Wei

引用次数: 0

Single-operation Rydberg phase gates via dynamic population suppression 通过动态种群抑制的单操作Rydberg相位门

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-09-01 DOI: 10.1038/s41534-026-01329-5

Sebastian C. Carrasco, Jabir Chathanathil, Svetlana A. Malinovskaya, Ignacio R. Sola, Vladimir S. Malinovsky

引用次数: 0

Attaining quantum sensing enhancement from monitored dissipative time crystals 从监测耗散时间晶体获得量子传感增强

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-09-01 DOI: 10.1038/s41534-026-01331-x

Eoin O’Connor, Victor Montenegro, Francesco Albarelli, Matteo G. A. Paris, Abolfazl Bayat, Marco G. Genoni

{"title":"Attaining quantum sensing enhancement from monitored dissipative time crystals","authors":"Eoin O’Connor, Victor Montenegro, Francesco Albarelli, Matteo G. A. Paris, Abolfazl Bayat, Marco G. Genoni","doi":"10.1038/s41534-026-01331-x","DOIUrl":"https://doi.org/10.1038/s41534-026-01331-x","url":null,"abstract":"This study investigates quantum-enhanced parameter estimation through continuous monitoring in open quantum systems that exhibit a dissipative time crystal phase. We first analytically derive the global quantum Fisher information (QFI) rate for boundary time crystals (BTCs), demonstrating that within the time-crystal phase, the ultimate precision exhibits a cubic scaling with the system size, fglobal ~ N3. We then generalize this finding to a broader class of dynamics, including the transverse collective dephasing (TCD) model, which achieves a time-crystal phase through a closing Liouvillian gap without requiring a dissipative phase transition. We proceed to numerically demonstrate that this maximal global QFI rate is experimentally attainable for both the BTC and TCD models, even at finite system sizes, via continuous homodyne and photodetection. Moving towards practical implementations, we analyze the precision limits under inefficient detection, revealing a critical difference: for BTC dynamics, inefficiencies asymptotically restore a classical scaling, and only a constant-factor quantum advantage remains possible. In contrast, for TCD dynamics, a super-classical scaling is still in principle observable, and our numerical simulations confirm its presence, even under inefficient measurement conditions, establishing the TCD model as a highly robust platform for quantum metrology.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"4 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148899586","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

Theoretical guarantees of variational quantum algorithm with guiding states 带引导态的变分量子算法的理论保证

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-09-01 DOI: 10.1038/s41534-026-01364-2

Tuyen Nguyen, Mária Kieferová

{"title":"Theoretical guarantees of variational quantum algorithm with guiding states","authors":"Tuyen Nguyen, Mária Kieferová","doi":"10.1038/s41534-026-01364-2","DOIUrl":"https://doi.org/10.1038/s41534-026-01364-2","url":null,"abstract":"Machine learning provides a powerful framework for predicting ground-state properties across families of quantum many-body problems, enabling amortized inference and reducing the cost of repeated simulations. Variational quantum algorithms (VQAs) are promising candidates for implementing such learnable solvers on quantum computers, yet rigorous guarantees for convergence and generalization remain scarce. Motivated by the fact that standard quantum phase estimation (QPE) provides provable performance when given a guiding state with non-trivial overlap with the ground state, we introduce a variational quantum algorithm with guiding states aiming towards predicting ground-state properties of quantum many-body systems. We then develop a proof technique—the linearization trick—that maps the training dynamics of the algorithm to those of a kernel model. This connection yields theoretical guarantees on both convergence and generalization for the VQA under the guiding state assumption. Our analysis shows that guiding states facilitate convergence, suppress finite-size error terms, and ensure stability across system dimensions. Finally, we validate our findings with numerical experiments on 2D random Heisenberg models.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"267 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148899523","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

Causal asymmetry of classical and quantum autonomous agents 经典和量子自主代理的因果不对称

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-09-01 DOI: 10.1038/s41534-026-01335-7

Spiros Kechrimparis, Mile Gu, Hyukjoon Kwon

引用次数: 0