J4 ›› 2011, Vol. 28 ›› Issue (4): 434-438.

• 量子光学 • 上一篇    下一篇

Kerr介质中失谐量对级联三能级原子纠缠演化的影响

王建荣,赖云忠,李坤   

  1. 太原科技大学物理系,山西 太原 030024
  • 收稿日期:2010-03-22 修回日期:2010-10-26 出版日期:2011-07-28 发布日期:2011-07-06
  • 通讯作者: 王建荣(1979—),讲师,主要研究方向为量子光学。 E-mail:wjr19992008@163.com。
  • 作者简介:王建荣(1979—),讲师,主要研究方向为量子光学。E-mail:wjr19992008@163.com。
  • 基金资助:

    山西省自然基金(20031006)资助项目

Influence of detuning on entanglement evolution of cascade three-level atom in Kerr medium

WANG Jianrong,LAI Yunzhong,LI Kun   

  1. Department of Physics, Taiyuan University of Science and Technology , Taiyuan 030024,China
  • Received:2010-03-22 Revised:2010-10-26 Published:2011-07-28 Online:2011-07-06

摘要:

利用量子理论,采用数值计算的方法对体系纠缠熵进行分析,得出光场相干参量、模间光子数、Kerr介质系数以及失谐量对级联三能级原子纠缠演化的影响。结果显示:纠缠强度随光场强度的增强而逐渐增强,模间光子数的增加可以使纠缠变得稳定。Kerr效应在光子数较多时影响显著。Kerr系数不变时,失谐量的增加会使纠缠强度增强,但这种影响主要体现在相互作用初期。

关键词: 量子光学 级联三能级原子 kerr介质 失谐量 量子纠缠

Abstract:

The effects of optical field coherence parameter, modular photon number, Kerr medium coefficient and detuning on the entanglement evolution of cascade three-level atom in Kerr medium are studied based on quantum theory and methods of numerical calculation. The results shows that the entanglement between atoms is enhanced in stronger optical field and the entanglement is steadied by increasing the modular photon number. Kerr effect is remarkable in more photon number. With invariable Kerr medium , the increase of detuning will strengthen the entanglement strength, but this effect primary incarnates only on initial time of interacting.

Key words: quantum optics, cascade three-level atom, Kerr medium, detuning, quantum entanglement

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