单模真空场中两个耦合二能级原子纠缠的时间演化特性

量子电子学报 , 2009, 26(1): 65-68. doi: 10.3969/j.issn.1007-5461.2009.01.011

单模真空场中两个耦合二能级原子纠缠的时间演化特性

张登玉 ^1, , 谢利军 ^2, , 唐世清 ^3, , 詹孝贵 ^4, , 高峰 ^5,

1.衡阳师范学院物理与电子信息科学系,湖南,衡阳,421008

2.衡阳师范学院物理与电子信息科学系,湖南,衡阳,421008;湘潭大学材料与光电物理学院,湖南,湘潭,411105

3.衡阳师范学院物理与电子信息科学系,湖南,衡阳,421008;湘潭大学材料与光电物理学院,湖南,湘潭,411105

4.衡阳师范学院物理与电子信息科学系,湖南,衡阳,421008

5.衡阳师范学院物理与电子信息科学系,湖南,衡阳,421008

基金项目: 湖南省自然科学基金(06JJ50118)

关键词：量子光学 , 单模真空场 , 二能级原子 , 纠缠 , 共生纠缠度

Time evolution of two coupling two-level atoms entanglement in a single-mode vacuum field

Keywords： quantum optics , single-mode vacuum field , two-level atom , entanglement , concurrence

研究了单模真空场中两个耦合二能级原子纠缠特性.运用密度矩阵方法,得到两能级原子约化密度矩阵.借助于共生纠缠度,研究两个耦合二能级原子纠缠的时间演化规律,讨论原子间偶极作用对原子间纠缠的影响.结果表明:原子间的偶极作用导致纠缠度的减少和时间演化周期的增加.

The time evolution of two coupling two-level atoms entanglement in a single-mode vacuum field is explored.The two-level atoms'reducible density matrix is obtained.The entangle-ment between two two-level atoms is investigated by virtue of concurrence.The influences of the atomic dipole-dipole interaction on the entanglement of the two atoms are discussed.It is shown that the atomic dipole-dipole interaction leads to the decrease of the degrees of the entanglement and the increase of its time evolution period.In order to prepare entangled state,the influence of the atomic dipole-dipole interaction should be reduced.

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