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Continuous--Variable Entanglement in a Coupled Field--Mesoscopic Josephson Junction System |
| ZENG Tian-Hai;SHAO Bin;CHANG Ping;ZOU Jian |
| Department of Physics, Beijing Institute of Technology, Beijing 100081 |
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| Cite this article: |
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ZENG Tian-Hai, SHAO Bin, CHANG Ping et al 2006 Chin. Phys. Lett. 23 2644-2647 |
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Abstract Continuous--variable entanglement in the interacting system of a mesoscopic Josephson junction with a squeezed field is investigated. It is shown that when the cavity field is initially prepared in a squeezed vacuum state and the junction in its lowest energy state, the coupling system can evolve into a two-mode Gaussian state. The time-dependent characteristic function in the Wigner representation for the system is analytically obtained, and the squeezing degree of the initial cavity field turns out to have not only an apparent enhancing but also a weakening effect on the entanglement of the coupling system under suitable parameter conditions.
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| Keywords:
03.65.Ud
42.50.Dv
85.25.Cp
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Published: 01 October 2006
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| PACS: |
03.65.Ud
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(Entanglement and quantum nonlocality)
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42.50.Dv
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(Quantum state engineering and measurements)
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85.25.Cp
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(Josephson devices)
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