Spin squeezing inequalities and entanglement of N qubit states -: art. no. 120502

被引：175
|
作者：
Korbicz, JK [1 ]
Cirac, JI
Lewenstein, M
机构：
[1] Leibniz Univ Hannover, Inst Theoret Phys, D-30167 Hannover, Germany
[2] Max Planck Inst Quantum Opt, D-85748 Garching, Germany
[3] ICFO, Barcelona 08034, Spain
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 12期
关键词：
D O I：
10.1103/PhysRevLett.95.120502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We derive spin squeezing inequalities that generalize the concept of the spin squeezing parameter and provide necessary and sufficient conditions for genuine 2-, or 3-qubit entanglement for symmetric states, and sufficient condition for N-qubit states. Our inequalities have a clear physical interpretation as entanglement witnesses, can be easily measured, and are given by complex but elementary expressions.
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页数：4
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