Exact variance of von Neumann entanglement entropy over the Bures-Hall measure

Exact variance of von Neumann entanglement entropy over the Bures-Hall measure
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冯·诺依曼纠缠熵相对于 Bures-Hall 度量的精确方差

DOI:
10.1103/physreve.102.062128
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发表时间:
2020
期刊:
影响因子:
2.4
通讯作者:
Wei, Lu
Wei, Lu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wei, Lu

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量子态之间的 Bures-Hall 距离度量是一种独特的度量,满足量子信息处理的各种有用属性。在这项工作中,我们研究了通过冯诺依曼熵测量的 Bures-Hall 系综上量子纠缠的统计行为。最近获得了此类系综上的平均冯·诺依曼熵,而这项工作的主要结果是相应方差的显式表达式,该方差指定了其平均值周围的波动。计算的起点是 Bures-Hall 系综和 Cauchy-Laguerre 系综的相关函数之间的联系。导出的方差公式与已知的均值公式一起得出有限尺寸系统的冯诺依曼熵分布的简单但准确的高斯近似。这种高斯近似也被推测为大维系统的极限分布。
The Bures-Hall distance metric between quantum states is a unique measure that satisfies various useful properties for quantum information processing. In this work, we study the statistical behavior of quantum entanglement over the Bures-Hall ensemble as measured by von Neumann entropy. The average von Neumann entropy over such an ensemble has been recently obtained, whereas the main result of this work is an explicit expression of the corresponding variance that specifies the fluctuation around its average. The starting point of the calculations is the connection between correlation functions of the Bures-Hall ensemble and those of the Cauchy-Laguerre ensemble. The derived variance formula, together with the known mean formula, leads to a simple but accurate Gaussian approximation of the distribution of von Neumann entropy of finite-size systems. This Gaussian approximation is also conjectured to be the limiting distribution for large dimensional systems.
萨卡-库马尔关于 Bures-Hall 系综上平均纠缠熵的猜想的证明
DOI: --
发表时间: 2020
期刊: Journal of Physics A: Mathematical and Theoretical
影响因子: --
作者:
Lu Wei
通讯作者: Lu Wei
DOI: 10.1103/physreve.96.022106
发表时间: 2017-08-03
期刊: PHYSICAL REVIEW E
影响因子: 2.4
作者:
Wei, Lu
通讯作者: Wei, Lu
DOI: 10.3390/e21050539
发表时间: 2019-05-27
期刊: Entropy (Basel, Switzerland)
影响因子: --
作者:
Wei L
通讯作者: Wei L