纠缠双原子与压缩相干态光场相互作用系统的量子纠缠

J4 ›› 2010, Vol. 27 ›› Issue (1): 57-62.

纠缠双原子与压缩相干态光场相互作用系统的量子纠缠

张彩花¹ 萨楚尔夫^1,2 格日乐¹

1内蒙古师范大学物理与电子信息学院，内蒙古呼和浩特 010022；
2内蒙古师范大学图书馆，内蒙古呼和浩特 010022

出版日期:2010-01-28 发布日期:2009-12-30
通讯作者: 萨楚尔夫(1962-)，男，蒙古族，内蒙古呼和浩特市人，内蒙古师范大学教授，硕士生导师，主要从事量子光学研究. E-mail:sacrf@imnu.edu.cn
作者简介:张彩花(1979- )，女，蒙古族，内蒙古赤峰人，现为内蒙古师范大学物理与电子信息学院硕士研究生，研究方向为量子光学. E-mail:zhang828920@yahoo.com.cn
基金资助:
国家自然科学基金资助项目(60467002)；
内蒙古自然科学基金资助项目(200408020107)；
内蒙古高等学校科研基金资助项目(NJ03038)

Quantum entanglement in a system of squeezed coherent state light field interacting with two entangled atoms

ZHANG Cai-Hua¹, SA Chu-Er-Fu^1,2, GE Ri-Le¹

1 College of Physics and Electronic Information, Inner Mongolia Normal University, Inner Mongolia, Huhhot 010022, China;
2 Library of Inner Mongolia Normal University, Inner Mongolia, Huhhot 010022, China

Published:2010-01-28 Online:2009-12-30

摘要/Abstract

摘要：

利用全量子理论,研究了双原子与压缩相干态光场相互作用系统的量子纠缠特性，分别讨论了相干态振幅参量、光场压缩参量和耦合系数比值对系统场熵和原子相对熵演化的影响.结果表明：当相干态振幅参量为零或很小时，两原子间纠缠度随时间演化规律和场-原子纠缠度随时间演化规律几乎相反，场-原子间的纠缠削弱了两原子间的纠缠.随着相干态振幅参量增大或光场压缩参量减小，在一定时域内，两原子处于稳定的纠缠态，并且这个时域逐渐变长，同时原子-原子平均纠缠度值增大，而场-原子平均纠缠度值减小.耦合系数比值（原子之间偶极-偶极相互作用）的增大会减弱原子与场之间的作用，使两原子始终处于最大纠缠态.

关键词: 量子光学, 量子纠缠, 相对熵, 场熵, 压缩相干态

Abstract:

The quantum entanglement in a system which is composed of two entangled atoms interacting with the squeezed coherent state is studied by means of the full quantum theory. The influences of the coherent amplitude factor, the squeezing factor, the ratio of two coupling coefficients on the entanglement property are discussed. The result shows that two atoms entanglement evolution property is opposed to atom-field entanglement evolution property when the coherent amplitude factor was zero or small. The interaction of the atoms and the field weaken the entanglement degree of atom-atom. With increasing coherent amplitude factor or decreasing squeezing factor of light, the time of two atoms stay in the steady entangled state become longer. The increase of the coherent amplitude factor or the decrease of squeezing factor of light will lead to the increase of atom-atom entanglement degree while the decrease of atoms-field entanglement degree. Moreover, the two-atom quantum state will stay in the maximum entangled state when the atomic dipole-dipole coupling coefficient is large enough.

Key words: quantum optics, quantum entanglement, relative entropy, field entropy, squeezed coherent state

张彩花萨楚尔夫格日乐. 纠缠双原子与压缩相干态光场相互作用系统的量子纠缠[J]. J4, 2010, 27(1): 57-62.

ZHANG Cai-Hua, SA Chu-Er-Fu, GE Ri-Le. Quantum entanglement in a system of squeezed coherent state light field interacting with two entangled atoms[J]. J4, 2010, 27(1): 57-62.

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