© 2026 Aqora Quantum S.A.S.

Terms Privacy Legal Notice

Acta Physica Sinica

Detecting quantum coherence and complex quantum systems in physical sources without a predefined basis

WANG Yukun, HAN Wenmin, Jincheng XING

Published Jan 1, 2026• 0 citations

Abstract

量子相干性是量子理论的核心特征，与纠缠、复数结构及随机性理论紧密相关，具有重要应用价值。近年来，量子相干性被视作一种量子资源，并建立了系统的相干性度量框架，涌现出多种度量方法。这些相干性度量方法都依赖于量子态的精确表征和预先选定的参考基。本文指出，量子相干性可以在半设备无关场景下被观测到，这意味着除了二维量子系统外，无需再信任相关设备及预先选择参考基。我们首先建立了非相干源的严格数学定义，进而利用Gram矩阵的秩分析理论，构建了线性和非线性两类相干性见证方案。理论证明显示，该方法不仅能有效区分相干源与非相干源，还能进一步鉴别系统的底层结构特性，即判定系统属于经典系统、实数量子系统还是复数量子系统。特别地，我们证明了在最小测量资源下线性见证的可行性，并通过行列式见证提供了更完备的检测手段。本研究为量子相干性资源验证提供了新的理论工具，对量子设备认证和量子基础研究具有重要意义。

DOI: 10.7498/aps.75.20251659

Related papers

Frontiers of tensor networks and their applications in quantum many-body physics

Y. F. Guo, Shuo Yang

张量网络方法是研究量子多体物理的重要理论框架，其核心思想是利用量子态内部的纠缠结构，将具有指数复杂度的量子态拆解为由低维张量构成的网络，从而实现对多体系统的高效表达和模拟。近年来，张量网络的研究已由封闭系统拓展至非厄米及开放量子系统，在理论发展和实际应用等方面均取得显著进展。本文系统回顾了张量网络方法的发展历程，重点介绍其在量子多体物理中的代表性应用，包括强关联电子系统、量子计算与量子信息、拓扑物态等方向。研究表明，张量网络能够高效精确地模拟强关联量子多体系统，刻画各种有序态之间的竞争。混态张量网络可描述含噪声的量子态，为理解本征拓扑序和对称性保护拓扑序提供统一的理论框架。总之，张量网络已成为连接量子多体计算、量子计算、拓扑物态的通用语言，并将在量子物理的研究中发挥更关键的作用。

Zhongguo kexue. Wulixue Lixue Tianwenxue•May 6, 2026•0 citations

Quantum Correlations Reduce Classical Correlations with Ancillary Systems

骆顺龙, 李楠

我们由单配偶的优点说明 classical/quantum 关联的两分。更精确，如果并且仅当状态的每个聚会能完美地与另外的辅助系统被相关，我们证明处于一个由两部组成的状态的关联是古典的。特别地，如果在二个聚会之间有量关联，这意味着那，那么古典(象量一样) 有另外的系统的二个聚会的相关能力不得不严格地被减少。[从作者抽象]

Chinese Physics Letters•Jan 1, 2010•0 citations

Strong-field-induced quantum coherent emission and its applications

ZHAO Jing, LIU Yi, WU Cheng-Yin +2 more

近年来，强场物理与量子光学两个领域交叉产生的物理效应正逐步成为研究热点。融合超快宽谱激发与共振调控，可在亚周期内制备电子-电子、电子-离子多体纠缠与相干，进而产生强场相干性诱导的空气激光、超连续辐射与自由感应衰变等新型相干辐射。本文围绕强场量子光学这一新兴交叉领域，聚焦强场下量子相干辐射及应用，综述其理论基础、物理机制及潜在应用等方面的现状和挑战。期望以此推动开放系统多体强场量子光学的理论与实验研究，以及对多自由度强场量子相干性建立、演化与弛豫规律的探索，拓展强场量子相干辐射与放大机制，为构建时-频-空稳定可控的新型辐射源、发展远程探测新技术、实现空气激光在痕量分子检测与燃烧诊断等方面的应用提供参考。

Acta Physica Sinica•Sep 4, 2026•0 citations

Information rates for photocount detection systems

Gary L. Fillmore, Gerard Lachs

A model that allows one to calculate information rates for optical communication systems that use photocount detection is presented. This model has its basis in the coherent states of the field. It consists of a source that places the field in a coherent state, a channel that can introduce additive Gaussian noise, and a photodetector that produces the number of photocounts in the detection interval as output symbols. The capability of introducing additive Gaussian noise can also be used to represent a physical source. The model is applied to several examples to illustrate its use. The rate of flow of information through the channel is calculated for a binary channel with and without additive Gaussian noise. The information rate for a noiseless channel is also obtained for the case in which the signals sent by a single-mode coherent source are selected from a Gaussian distribution.

IEEE Transactions on Information Theory•Jul 1, 1969•17 citations

Quantum System中的自适应概率模型调整

Jincheng Zhang

Quantum system中的自适应概率模型调整旨在提高量子系统的可靠性。本研究提出了一种基于机器学习的自适应概率模型调整方法,通过对量子系统状态的动态分析,自动调整概率模型参数,从而实现自适应校正。我们的研究结果表明,该方法可以有效提高量子系统的量子精度和稳定性,并为量子计算领域提供了一种新的模型校正策略。

•Sep 6, 2026•0 citations

Witnessing Quantum Coherence: from solid-state to biological systems

Che‐Ming Li, Neill Lambert, Yueh-Nan Chen +2 more

Quantum coherence is one of the primary non-classical features of quantum systems. While protocols such as the Leggett-Garg inequality (LGI) and quantum tomography can be used to test for the existence of quantum coherence and dynamics in a given system, unambiguously detecting inherent "quantumness" still faces serious obstacles in terms of experimental feasibility and efficiency, particularly in complex systems. Here we introduce two "quantum witnesses" to efficiently verify quantum coherence and dynamics in the time domain, without the expense and burden of non-invasive measurements or full tomographic processes. Using several physical examples, including quantum transport in solid-state nanostructures and in biological organisms, we show that these quantum witnesses are robust and have a much finer resolution in their detection window than the LGI has. These robust quantum indicators may assist in reducing the experimental overhead in unambiguously verifying quantum coherence in complex systems.

arXiv:1212.0194•Scientific Reports•Nov 26, 2012•297 citations

量子相干性是量子理论的核心特征，与纠缠、复数结构及随机性理论紧密相关，具有重要应用价值。近年来，量子相干性被视作一种量子资源，并建立了系统的相干性度量框架，涌现出多种度量方法。这些相干性度量方法都依赖于量子态的精确表征和预先选定的参考基。本文指出，量子相干性可以在半设备无关场景下被观测到，这意味着除了二维量子系统外，无需再信任相关设备及预先选择参考基。我们首先建立了非相干源的严格数学定义，进而利用Gram矩阵的秩分析理论，构建了线性和非线性两类相干性见证方案。理论证明显示，该方法不仅能有效区分相干源与非相干源，还能进一步鉴别系统的底层结构特性，即判定系统属于经典系统、实数量子系统还是复数量子系统。特别地，我们证明了在最小测量资源下线性见证的可行性，并通过行列式见证提供了更完备的检测手段。本研究为量子相干性资源验证提供了新的理论工具，对量子设备认证和量子基础研究具有重要意义。

张量网络方法是研究量子多体物理的重要理论框架，其核心思想是利用量子态内部的纠缠结构，将具有指数复杂度的量子态拆解为由低维张量构成的网络，从而实现对多体系统的高效表达和模拟。近年来，张量网络的研究已由封闭系统拓展至非厄米及开放量子系统，在理论发展和实际应用等方面均取得显著进展。本文系统回顾了张量网络方法的发展历程，重点介绍其在量子多体物理中的代表性应用，包括强关联电子系统、量子计算与量子信息、拓扑物态等方向。研究表明，张量网络能够高效精确地模拟强关联量子多体系统，刻画各种有序态之间的竞争。混态张量网络可描述含噪声的量子态，为理解本征拓扑序和对称性保护拓扑序提供统一的理论框架。总之，张量网络已成为连接量子多体计算、量子计算、拓扑物态的通用语言，并将在量子物理的研究中发挥更关键的作用。

近年来，强场物理与量子光学两个领域交叉产生的物理效应正逐步成为研究热点。融合超快宽谱激发与共振调控，可在亚周期内制备电子-电子、电子-离子多体纠缠与相干，进而产生强场相干性诱导的空气激光、超连续辐射与自由感应衰变等新型相干辐射。本文围绕强场量子光学这一新兴交叉领域，聚焦强场下量子相干辐射及应用，综述其理论基础、物理机制及潜在应用等方面的现状和挑战。期望以此推动开放系统多体强场量子光学的理论与实验研究，以及对多自由度强场量子相干性建立、演化与弛豫规律的探索，拓展强场量子相干辐射与放大机制，为构建时-频-空稳定可控的新型辐射源、发展远程探测新技术、实现空气激光在痕量分子检测与燃烧诊断等方面的应用提供参考。

A model that allows one to calculate information rates for optical communication systems that use photocount detection is presented. This model has its basis in the coherent states of the field. It consists of a source that places the field in a coherent state, a channel that can introduce additive Gaussian noise, and a photodetector that produces the number of photocounts in the detection interval as output symbols. The capability of introducing additive Gaussian noise can also be used to represent a physical source. The model is applied to several examples to illustrate its use. The rate of flow of information through the channel is calculated for a binary channel with and without additive Gaussian noise. The information rate for a noiseless channel is also obtained for the case in which the signals sent by a single-mode coherent source are selected from a Gaussian distribution.

Quantum coherence is one of the primary non-classical features of quantum systems. While protocols such as the Leggett-Garg inequality (LGI) and quantum tomography can be used to test for the existence of quantum coherence and dynamics in a given system, unambiguously detecting inherent "quantumness" still faces serious obstacles in terms of experimental feasibility and efficiency, particularly in complex systems. Here we introduce two "quantum witnesses" to efficiently verify quantum coherence and dynamics in the time domain, without the expense and burden of non-invasive measurements or full tomographic processes. Using several physical examples, including quantum transport in solid-state nanostructures and in biological organisms, we show that these quantum witnesses are robust and have a much finer resolution in their detection window than the LGI has. These robust quantum indicators may assist in reducing the experimental overhead in unambiguously verifying quantum coherence in complex systems.