| Continuous-Variable Entanglement in a Coupled Field-Mesoscopic Josephson Junction System |
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| 作者姓名： | 曾天海 邵彬 常平 邹健 |
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| 作者单位： | Department of Physics, Beijing Institute of Technology, Beijing 100081 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant Nos 10374007 and 60472021. |
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| 摘 要： |
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| 关 键 词： | 连续变量纠缠 挤压真空 挤压场 最低能量态 特征方程 |
| 收稿时间： | 2006-05-09 |
| 修稿时间： | 2006-05-09 |
Continuous-Variable Entanglement in a Coupled Field-Mesoscopic Josephson Junction System |
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| ZENG Tian-Hai, SHAO Bin, CHANG Ping, ZOU Jian.Continuous-Variable Entanglement in a Coupled Field-Mesoscopic Josephson Junction System[J].Chinese Physics Letters,2006,23(10):2644-2647. |
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| Authors: | ZENG Tian-Hai SHAO Bin CHANG Ping ZOU Jian |
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| Institution: | Department of Physics, Beijing Institute of Technology, Beijing 100081 |
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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 Caussian state. The timedependent 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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