Conditions for entanglement in multipartite systems

被引：38
作者：
Hillery, Mark [1 ]
Ho Trung Dung [1 ,2 ]
Zheng, Hongjun [1 ]
机构：
[1] CUNY Hunter Coll, Dept Phys, New York, NY 10065 USA
[2] Acad Sci & Technol, Inst Phys, Ho Chi Minh City, Vietnam
来源：
PHYSICAL REVIEW A | 2010年 / 81卷 / 06期
基金：
美国国家科学基金会;
关键词：
QUANTUM ENTANGLEMENT; INEQUALITIES; STATES; INFORMATION; BELL;
D O I：
10.1103/PhysRevA.81.062322
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We introduce two entanglement conditions that take the form of inequalities involving expectation values of operators. These conditions are sufficient conditions for entanglement; that is, if they are satisfied the state is entangled, but if they are not, one can say nothing about the entanglement of the state. These conditions are quite flexible, because the operators in them are not specified, and they are particularly useful in detecting multipartite entanglement. We explore the range of utility of these conditions by considering a number of examples of entangled states, and seeing under what conditions entanglement in them can be detected by the inequalities presented here.
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页数：6
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