Persistency of entanglement and nonlocality in multipartite quantum systems

被引：20

作者：

Brunner, Nicolas ^{[1
,2
]}

Vertesi, Tamas ^{[3
]}

机构：

[1] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[2] Univ Geneva, Dept Phys Theor, CH-1211 Geneva, Switzerland

[3] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary

来源：

PHYSICAL REVIEW A | 2012年 / 86卷 / 04期

基金：

瑞士国家科学基金会; 英国工程与自然科学研究理事会;

关键词：

STATES;

D O I：

10.1103/PhysRevA.86.042113

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The behavior under particle loss of entanglement and nonlocality is investigated in multipartite quantum systems. In particular, we define a notion of persistency of nonlocality, which leads to device-independent tests of persistent entanglement. We investigate the persistency of various classes of multipartite quantum states, exhibiting a variety of different behaviors. A particular attention is devoted to states featuring maximal persistency. Finally we discuss a link between the symmetry of a state and its persistency, illustrating the fact that too much symmetry reduces the strength of correlations among subsystems. These ideas also lead to a device-independent estimation of the asymmetry of a quantum state.

引用

页数：6

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