Entanglement and non-locality are different resources

被引:35
作者
Brunner, N [1 ]
Gisin, N [1 ]
Scarani, V [1 ]
机构
[1] Univ Geneva, Appl Phys Grp, CH-1211 Geneva, Switzerland
来源
NEW JOURNAL OF PHYSICS | 2005年 / 7卷
关键词
D O I
10.1088/1367-2630/7/088
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Bell's theorem states that, to simulate the correlations created by measurement on pure entangled quantum states, shared randomness is not enough: some 'non-local' resources are required. It has been demonstrated recently that all projective measurements on the maximally entangled state of two qubits can be simulated with a single use of a 'non-local machine'. We prove that a strictly larger amount of this non-local resource is required for the simulation of pure non-maximally entangled states of two qubits |psi(alpha)] = cos alpha| 00] + sin alpha| 11] with 0 < alpha less than or similar to pi/7.8.
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页数:14
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