Quantum nonlocality and applications in quantum-information processing of hybrid entangled states

被引:23
作者
Chen, ZB [1 ]
Hou, G
Zhang, YD
机构
[1] Univ Sci & Technol China, Dept Modern Phys, Hefei 230027, Anhui, Peoples R China
[2] CCAST, World Lab, Beijing 100080, Peoples R China
来源
PHYSICAL REVIEW A | 2002年 / 65卷 / 03期
关键词
D O I
10.1103/PhysRevA.65.032317
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Hybrid entangled states generated, e. g., in a trapped-ion or atom-cavity system, have exactly one ebit of entanglement, but are not maximally entangled. We demonstrate this by showing that they violate, but, in general, not maximally, Bell's inequality due to Clauser, Horne, Shimony, and Holt [Phys. Rev. Lett. 23, 880 (1969)]. These states are interesting in that they exhibit the entanglement between two distinct degrees of freedom (one is discrete and another is continuous). We then demonstrate these entangled states as a valuable resource in quantum-information processing including quantum teleportation, entanglement swapping and quantum computation with "parity qubits.'' Our work establishes an interesting link between quantum-information protocols of discrete and continuous variables.
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页数:5
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