Non-destructive Orthonormal State Discrimination

针对含数百个手性分子的气态样品的单次非破坏性量子传感

Single-shot Non-destructive Quantum Sensing for Gaseous Samples with Hundreds of Chiral Molecules

针对微量手性物质高效识别的需求，提出结合微波对映体特异性态转移与微波谐振腔辅助非破坏探测的单次量子传感方法，可高置信度识别数百至数千分子的气态样品手性，有望拓展至单分子水平。

Nondestructive discrimination of a new family of highly entangled states in IBM quantum computer

Measurement-based quantum computation (MQC) is a leading paradigm for building a quantum computer. Cluster states being used in this context act as one-way quantum computers. Here, we consider Z-states as a type of highly entangled states like cluster states, which can be used for one-way or measurement based quantum computation. We define Z-state basis as a set of orthonormal states which are as equally entangled as the cluster states. We design new quantum circuits to non-destructively discriminate these highly entangled Z-states. The proposed quantum circuits can be generalized for N-qubit …

量子增强的生物分子手性鉴别

Quantum-elevated Chiral Discrimination for Bio-molecules

本研究提出利用量子噪声压缩的极化纠缠态实现生物分子手性鉴别，显著提升灵敏度和鉴别能力。

远距离各方之间贝尔态的无损区分

Nondestructive discrimination of Bell states between distant parties

本文提出利用预共享纠缠资源对远距离各方持有的贝尔态进行无损区分的方案，证明无辅助资源时成功概率上限为1/4，并在IonQ量子计算机上验证其可超越经典界限。

纠缠量子态局域判别中信息增益与扰动的权衡

Trade-off between Information Gain and Disturbance in Local Discrimination of Entangled Quantum States

本文建立了局域态判别中信息增益与扰动的权衡关系，指出纠缠度越高局域判别越难，并提出基于稳定子形式的自适应非破坏性策略以降低预共享纠缠代价，同时应用于鲁棒的纠缠认证协议。

A framework for bounding nonlocality of state discrimination

We consider the class of protocols that can be implemented by local quantum operations and classical communication (LOCC) between two parties. In particular, we focus on the task of discriminating a known set of quantum states by LOCC. Building on the work in the paper "Quantum nonlocality without entanglement" [BDF+99], we provide a framework for bounding the amount of nonlocality in a given set of bipartite quantum states in terms of a lower bound on the probability of error in any LOCC discrimination protocol. We apply our framework to an orthonormal product basis known as the domino states…

利用相干激发对光镊阵列中单原子进行最小破坏性快速成像

Minimally Destructive Fast Imaging of Single Atoms in an Optical Tweezer Array with Coherent Excitation

提出一种通过交替反向传播π脉冲实现确定性相干激发的方法，用于光镊阵列中单原子的最小破坏性快速成像，实验演示了在17.6微秒内达到99.89%的鉴别保真度和98.80%的存活概率，且加热率仅为非相干激发方案的一半。

用微扰极小的局部测量感知相对论量子场

Sensing relativistic quantum fields with minimally perturbing local measurements

该研究在相对论量子场论中开发微扰极小的局部测量框架，通过弱耦合指针和因果可允许的克劳斯更新感知场局部性质，用于类空探测、粒子密度计算及纠缠态区分等，实现非破坏性测量。

Compounds of symmetric informationally complete measurements and their application in quantum key distribution

Symmetric informationally complete measurements (SICs) are elegant, celebrated and broadly useful discrete structures in Hilbert space. We introduce a more sophisticated discrete structure compounded by several SICs. A SIC-compound is defined to be a collection of $d^3$ vectors in $d$-dimensional Hilbert space that can be partitioned in two different ways: into $d$ SICs and into $d^2$ orthonormal bases. While a priori their existence may appear unlikely when $d>2$, we surprisingly answer it in the positive through an explicit construction for $d=4$. Remarkably this SIC-compound admits a close …

Estimating coherence with respect to general quantum measurements

The conventional coherence is defined with respect to a fixed orthonormal basis, i.e., to a von Neumann measurement. Recently, generalized quantum coherence with respect to general positive operator-valued measurements (POVMs) has been presented. Several well-defined coherence measures, such as the relative entropy of coherence $C_{r}$, the $l_{1}$ norm of coherence $C_{l_{1}}$ and the coherence $C_{T,α}$ based on Tsallis relative entropy with respect to general POVMs have been obtained. In this work, we investigate the properties of $C_{r}$, $l_{1}$ and $C_{T,α}$. We estimate the upper bounds…

Coherence quantifiers from the viewpoint of their decreases in the measurement process

Measurements can be considered as a genuine example of processes that crush quantum coherence. In the case of an observable with degeneracy, the formulations of Lüders and von Neumann are known. These pictures postulate the two different states of a system immediately following the act of measurement. Hence, they are associated with divers variants of coherence losses during the measurement. Recent studies have focused on several ways to characterize quantum coherence appropriately. One of the existing types of quantifier is based on quantum $α$-divergences of the Tsallis type. In this paper, …

利用纠缠对偏振物体进行非局域量子区分

Nonlocal quantum differentiation between polarization objects using entanglement

本文实验实现了一种基于偏振纠缠光子对和远程态制备的非局域量子测量方案，仅需两次符合测量即可区分80多个具有不同穆勒矩阵的透明及双折射样品，显著少于全面检测所需的至少8次测量，展示了其在生物医学诊断和遥感等分类检测任务中的高效潜力。