Smallest state spaces for which bipartite entangled quantum states are separable

Smallest state spaces for which bipartite entangled quantum states are separable
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二分纠缠量子态可分离的最小状态空间

DOI:
10.1088/1367-2630/17/9/093047
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发表时间:
2015
影响因子:
3.3
通讯作者:
Anwar H
Anwar H
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Anwar H

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根据通常的定义,纠缠态不能用局域密度算符的乘积来分解。如果我们放松对局域算符为正的要求,那么纠缠量子态可以用更一般的单系统算符集合来进行可分分解。这种形式的可分性可用于构建经典模型和模拟方法时,只有一组有限的测量是可用的。考虑到这些动机,我们问什么是最小的本地运营商,使一个纯粹的二分纠缠量子态成为可分离的?我们发现,在最大纠缠态的情况下,有许多不等价的解决方案,包括例如在离散维格纳函数的研究中出现的相点算子的集合。因此,我们提供了一种新的方式来解释这些运营商,更一般地说,提供了一种替代方法来构建本地隐藏变量模型的量子测量子集下的纠缠量子态。
According to usual definitions, entangled states cannot be given a separable decomposition in terms of products of local density operators. If we relax the requirement that the local operators be positive, then an entangled quantum state may admit a separable decomposition in terms of more general sets of single-system operators. This form of separability can be used to construct classical models and simulation methods when only a restricted set of measurements is available. With these motivations in mind, we ask what are the smallest sets of local operators such that a pure bipartite entangled quantum state becomes separable? We find that in the case of maximally entangled states there are many inequivalent solutions, including for example the sets of phase point operators that arise in the study of discrete Wigner functions. We therefore provide a new way of interpreting these operators, and more generally, provide an alternative method for constructing local hidden variable models for entangled quantum states under subsets of quantum measurements.
DOI: 10.1103/physrevlett.114.120401
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影响因子: 8.6
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