双模光场与Λ型三能级原子量子纠缠的精确解

J4 ›› 2018, Vol. 35 ›› Issue (2): 184-190.

双模光场与Λ型三能级原子量子纠缠的精确解

丛红璐, 刘雪华, 赵玉娜, 于娜, 任学藻

1北京交通大学海滨学院，河北黄骅 061199； 2西南科技大学理学院，四川绵阳 621010

收稿日期:2017-03-23 修回日期:2017-04-27 出版日期:2018-03-28 发布日期:2018-03-30
通讯作者: 丛红璐(1984-), 辽宁锦州人, 硕士, 讲师, 主要从事量子光学方面的研究。 E-mail: conghonglu@163.com
基金资助:
Supported by Higher Education Natural Science Foundation for Youth Scientist of Hebei Province（河北省高等学校科学技术研究青年基金, QN2017401）, Innovation Ability Promotion Program Soft Science Research and Science Popularization Project（河北省创新能力提升计划软科学研究及科普专项, 17K55304D）, Construction Project for Experimental Teaching Demonstration Center of Hebei Province（河北省实验教学示范中心建设项目）

Exact solution of quantum entanglement of a two-mode field interacting with a -type three-level atom

CONG Honglu, LIU Xuehua, ZHAO Yu-na, YU Na, REN Xuezao

1 Haibin College, Beijing Jiaotong University, Huanghua 061199, China; 2 School of Science, Southwest University of Science and Technology, Mianyang 621010, China

Received:2017-03-23 Revised:2017-04-27 Published:2018-03-28 Online:2018-03-30

摘要/Abstract

摘要： 在非旋波近似下，对双模相干态光场与型三能级原子相互作用系统的量子纠缠进行了精确求解，讨论了平均光子数及失谐量对量子纠缠演化的影响。数值计算结果表明：量子纠缠的周期随平均光子数的增大而增大；量子纠缠最大值随失谐的增大逐渐降低，且达到最大值所需时间逐渐增加；当失谐较大时，量子纠缠在较短时间内具有较好的周期性；随着平均光子数及失谐的增大，虚光子效应使量子纠缠演化曲线小锯齿状的振荡逐渐增强。

关键词: 量子光学；量子纠缠；相干态正交化展开；三能级原子；非旋波近似

Abstract: Quantum entanglement of a two-mode coherent field interacting with a -type three-level atom system is solved exactly without rotating wave approximation, and the influence of mean photon number and detuning on quantum entanglement evolution is discussed. Numerical results show that the quantum entanglement period increases with the increasing of mean photon number. The quantum entanglement maximum decreases gradually with increasing of detuning, and the time reaching the maximum increases gradually. When the detuning is relative large, the quantum entanglement has better periodicity in a relatively short period. The small zigzag shaped oscillation of quantum entanglement evolution curve due to virtual photon effect is gradually enhanced with the increasing of mean photon number and detuning.

Key words: quantum optics; quantum entanglement; coherent-state orthogonalization expansion; three-level atom; without rotating wave approximation

丛红璐, 刘雪华, 赵玉娜, 于娜, 任学藻. 双模光场与Λ型三能级原子量子纠缠的精确解[J]. J4, 2018, 35(2): 184-190.

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