Quantum nonlocality without entanglement
Quantum nonlocality without entanglement
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DOI：
10.1103/physreva.59.1070
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发表时间：
1999-02-01
影响因子：
2.9
通讯作者：
Wootters, WK
中科院分区：
文献类型：
--
作者：
Bennett, CH;DiVincenzo, DP;Wootters, WK
我们展示了两个三态粒子的产物态的正交集，然而，不能可靠地区分由一对分离的观察者的无知的状态已提交给他们，即使观察者被允许任何序列的本地操作和经典的单独的观察者之间的通信。证明了在这些状态上的联合测量和只允许局部作用的测量所获得的互信息之间存在有限的间隙。这个结果意味着存在不可局部实现的可分超算子。一组状态被发现涉及三个两态粒子，也似乎是不可测量的本地。这些和其他多体态是根据熵和纠缠成本的准备和测量它们的本地操作。[S1050-2947（99）00302-9]。
We exhibit an orthogonal set of product states of two three-state particles that nevertheless cannot be reliably distinguished by a pair of separated observers ignorant of which of the states has been presented to them, even if the observers are allowed any sequence of local operations and classical communication between the separate observers. It is proved that there is a finite gap between the mutual information obtainable by a joint measurement on these stales and a measurement in which only local actions are permitted. This result implies the existence of separable superoperators that cannot be implemented locally. A set of states are found involving three two-state particles that also appear to be nonmeasurable locally. These and other multipartite states are classified according to the entropy and entanglement costs of preparing and measuring them by local operations. [S1050-2947(99)00302-9].