三Jaynes-Cummings模型中原子的纠缠特性
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卢道明(1963-),男,福建省永定县人,硕士,教授,研究方向 为量子光学.

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O431.2

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福建省自然科学基金(2011J01018)资助项目 (武夷学院 电子工程系,福建 武夷山 354300)


Tripartite entanglement properties among atoms in three Jaynes-Cummings model
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    摘要:

    考虑初始处于类GHZ态的3个全同二能级原子1、2和 3,它们分别与空间分离的单模 光腔发生共振相互作用的情况。利用Jaynes-Cummings模型给出了系统态矢的演化。采用纠 缠张量方法, 通过数值计算研究了3个原子体系的三体纠缠量和三体中两两间的纠缠量的演化。研究结果 表明,随原子初态纠缠度的增大,原子间三体纠缠和两体纠缠均增强。

    Abstract:

    In this paper we consider the situation that three identical two-level atoms re sonantly in teract with three distant single-mode optical cavities via a one-photon hopping separately.Three atoms are in like-GHz state and therr optical cavities are all in vacuum state initially.Using the Jaynes-C ummings,the time evolution of the system is given.We adopt the entanglement tensor approach to quantify the degre e of entanglement. The tripartite entanglement dynamics among three atoms and the entanglement dyna mics between two atoms are studied.The influence of atomic states initially on t ripartite entanglement among atoms and two-body entanglement between two atoms are discussed.The results obtained using the numerical method show: first,the time evolution of tripartite entanglement displays the periodic oscill ation behavior and its oscillation period is not realted with the initial degree of entanglement among atmos;second the peak and mean of entanglement measures E3 and F2 incease with i ncreasing of the initial degree of entanglement among atmos,which means that the larger the initial degree of entanglement among atoms,the layer the tripartite entanglement among atoms and the two-body entanglement between atoms;third,the phenomenon of sudden death of entanglement between two atoms occurs,and the leng th of the death time interval decreases with increasing of the initial degree of entanglement among atoms.This shows that the length of the death time interval of two-body entanglement can be decreased by selecting initially atomic state w ith high degree of entanglement among atoms.

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卢道明.三Jaynes-Cummings模型中原子的纠缠特性[J].光电子激光,2013,(1):197~201

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  • 收稿日期:2012-07-01
  • 最后修改日期:2012-08-27
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