Violating Bell's inequality beyond Cirel'son's bound

被引：27
|
作者：
Cabello, A [1 ]
机构：
[1] Univ Seville, Dept Fis Aplicada 2, E-41012 Seville, Spain
来源：
PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 06期
关键词：
D O I：
10.1103/PhysRevLett.88.060403
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Cirel'son inequality states that the absolute value of the combination of quantum correlations appearing in the Clauser-Horne-Shimony-Holt (CHSH) inequality is bound by 2root2. It is shown that the correlations of two qubits belonging to a three-qubit system can violate the CHSH inequality beyond 2root2. Such a violation is not in conflict with Cirel'son's inequality because it is based on postselected systems. The maximum allowed violation of the CHSH inequality, 4, can be achieved using a Greenberger-Horne-Zeilinger state.
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页数：4
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