精确求解与Λ型原子作用二项式光场的量子特性  

Exact Solution for Quantum Properties of the Binomial States Field Interacting with the A-Type Atom

作　　者：丛红璐[1] 任学藻[2] 

机构地区：[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

出　　处：《光学学报》2017年第2期256-264,共9页Acta Optica Sinica

基　　金：教育部高等学校物理类专业教学指导委员会力学教学改革项目(JZW-16-LX-07);河北省高等学校科学技术研究青年基金项目;河北省实验教学示范中心建设项目;北京交通大学海滨学院教研项目(HBJY16004)

摘　　要：在非旋波近似下,对二项式光场与Λ型三能级原子相互作用的量子特性进行了精确求解。讨论了二项式光场系数以及初始时刻原子能级的叠加对二阶相干度和光场压缩特性的影响。数值计算的结果表明,随着光场系数的增大,反聚束效应持续时间逐渐增大,初始时刻原子能级的叠加导致光场聚束效应持续时间增大。无论初始时刻原子能级是否叠加,随着光场系数的增大,光场压缩效应持续时间均先增大后减小。由于非旋波项产生的虚光子效应,二阶相干度和光场压缩效应演化曲线出现小锯齿状振荡。The quantum properties of a binomial state field interacting with a A-type three-level atom are calculated accurately under non-rotating wave approximation. The influences of the binomial state field parameter and the superposition of atomic energy level at the initial time on the second-order coherence degree and the field squeezing effect are discussed. The numerical results indicate that the duration of the anti-bunching effect and the duration of the bunching effect due to the superposition of atomic energy level at the initial time becomes longer, with the increase of binomial state field parameter. Increasing the field parameter, the duration of the squeezing effect increases at first and then decreases whether the atomic energy level has a superposition or not. The little indentation oscillation appears in the evolution curves of the second-order coherence degree and the field squeezing effect, because of the virtual photon effect induced by non-rotating wave approximation.

关 键 词：量子光学 A型三能级原子 非旋波近似 二阶相干度 光场压缩效应 

分 类 号：O431.2[机械工程—光学工程]