| 依赖强度耦合双模Jaynes-Cummings 模型的纠缠和场熵演化 |
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| 引用本文： | 高云峰,冯健,王继锁.依赖强度耦合双模Jaynes-Cummings 模型的纠缠和场熵演化[J].中国物理 B,2005,14(5):980-984. |
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| 作者姓名： | 高云峰 冯健 王继锁 |
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| 作者单位： | College of Educational Technology and Massmedium, Liaocheng University, Liaocheng 252059, China;Institute of Optical Communication, Liaocheng University, Liaocheng, 252059, China; State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences，Wuhan, 430071, China;Institute of Optical Communication, Liaocheng University, Liaocheng, 252059, Chin |
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| 基金项目： | Project supported by the Natural Science Foundation of Shandong Province (Grant No.Y2004A09),China. |
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| 摘 要： | 应用von Neumann熵研究了依赖强度耦合双模Jaynes-Cummings模型中原子与光场的纠缠度。给出了两模初始场均处于相干态和双模压缩真空态两种情况下熵演化的数值结果。讨论了初始场强度对原子―场纠缠度的影响。发现在强场条件下，原子与光场基本稳定在最大纠缠态但伴随着周期性的脉冲式解纠缠。
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| 关 键 词： | 纠缠度 von Neumann熵 双模Jaynes-Cummings模型 依赖强度耦合 |
| 收稿时间： | 2004-08-31 |
Evolution of field entropy and entanglement in the intensity-dependent two-mode Jaynes-Cummings model |
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| Gao Yun-Feng,Feng Jian and Wang Ji-Suo.Evolution of field entropy and entanglement in the intensity-dependent two-mode Jaynes-Cummings model[J].Chinese Physics B,2005,14(5):980-984. |
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| Authors: | Gao Yun-Feng Feng Jian and Wang Ji-Suo |
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| Institution: | College of Educational Technology and Massmedium, Liaocheng University, Liaocheng 252059, China; Institute of Optical Communication, Liaocheng University, Liaocheng, 252059, Chin; Institute of Optical Communication, Liaocheng University, Liaocheng, 252059, China; State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences，Wuhan, 430071, China |
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| Abstract: | The evolution of the entanglement degree of two-mode fields and atom with the intensity-dependent coupling is investigated by using von Neumann entropy. The results for the initial fields in both coherent states and two-mode squeezed vacuum state are calculated. The influence of the field intensity on the entropy is discussed. It is found that the field and atom are in maximum entanglement but go with periodic pulse disentanglement completely under the condition of strong initial field. |
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| Keywords: | degree of entanglement von Neumann entropy two-mode Jaynes-Cummings model intensity-dependent coupling |
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