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国家自然科学基金(06jj50014)

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Quantum entanglement and nonlocality properties of two-mode Gaussian squeezed states
2009年
Quantum entanglement and nonlocality properties of a family of two-mode Gaussian pure states have been investigated. The results show that the entanglement of these states is determined by both the two-mode squeezing parameter and the difference of the two single-mode squeezing parameters. For the same two-mode squeezing parameter, these states show larger entanglement than the usual two-mode squeezed vacuum state. The violation of Bell inequality depends strongly on all the squeezing parameters of these states and disappears completely in the limit of large squeezing. In particular, these states can exhibit much stronger violation of local realism than two-mode squeezed vacuum state in the range of experimentally available squeezing values.
向少华邵彬宋克慧
关键词:ENTANGLEMENTNONLOCALITY
Multipartite entanglement in the interaction system between a single-mode microwave cavity field and superconducting charge qubits
2007年
This paper proposes a method of generating multipartite entanglement through using d.c. superconducting quan- tum interference devices (SQUID) inside a standing wave cavity. In this scheme, the d.c. SQUID works in the charge region. It is shown that, a large number of important multipartite entangled states can be generated by a controllable interaction between a cavity field and qubits. It is even possible to produce entangled states involving different cavity modes based on the measurement of charge qubits states. After such superpositions states are created, the interaction can be switched off by the classical magnetic field through the SQUID, and there is no information transfer between the cavity field and the charge qubits.
施振刚谌雄文朱喜香宋克慧
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