| 玻色-爱因斯坦凝聚体自囚禁现象的动力学相变及其量子纠缠特性 |
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| 引用本文： | 马云,傅立斌,杨志安,刘杰.玻色-爱因斯坦凝聚体自囚禁现象的动力学相变及其量子纠缠特性[J].物理学报,2006,55(11):5623-5628. |
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| 作者姓名： | 马云 傅立斌 杨志安 刘杰 |
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| 作者单位： | (1)北京应用物理与计算数学研究所,北京 100088; (2)济南大学理学院,济南 250022 |
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| 基金项目： | 国家自然科学基金;中国物理研究院预研项目 |
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| 摘 要： | 研究了量子涨落对自囚禁现象的影响.采用玻色-爱因斯坦凝聚体(BEC)两模模型进行研究，发现有限粒子BEC系统自囚禁现象的发生同样存在临界现象，但是由于量子涨落的影响使得这个临界现象变得模糊，并且粒子数越小量子涨落的影响越明显.为了更加明确地描述有限粒子系统的自囚禁现象，通过系统各态平均占有概率的熵(简称平均熵)和平均纠缠熵来刻画自囚禁现象，并讨论自囚禁现象发生前后系统的纠缠特性.
关键词：
玻色-爱因斯坦凝聚(BEC)
自囚禁
纠缠熵
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| 关 键 词： | 玻色-爱因斯坦凝聚(BEC) 自囚禁 纠缠熵 |
| 文章编号： | 1000-3290/2006/55(11)/5623-06 |
| 收稿时间： | 10 30 2005 12:00AM |
| 修稿时间： | 2005-10-302006-02-13 |
Dynamical phase changes of the self-trapping of Bose-Einstein condensates and its characteristic of entanglement |
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| Ma Yun,Fu Li-Bin,Yang Zhi-An,Liu Jie.Dynamical phase changes of the self-trapping of Bose-Einstein condensates and its characteristic of entanglement[J].Acta Physica Sinica,2006,55(11):5623-5628. |
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| Authors: | Ma Yun Fu Li-Bin Yang Zhi-An Liu Jie |
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| Institution: | 1. Jinan University, Jinan 250022, China;2.Institute of Applied Physics and Computational Mathematics, Beijing 100088, China |
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| Abstract: | In this paper, we exploit two-mode model to investigate the influence of quantum fluctuation on the self-trapping of the Bose-Einstein Condensate(BEC). We found that, even for the finite number of particles, the transition to self-trapping is still observed.In particular, because of the quantum fluctuation due to the finite number of particles, the critical phenomenon becomes fuzzily: the smaller the number of particles is, the more obviously fuzzily the critical phenomenon becomes. Quantum entanglement entropy is then introduced to depict the critical behavior near the transition point. |
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| Keywords: | Bose-Einstein condensate (BEC) self-trapping entanglement entropy |
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