与级联三能级原子相互作用的二项式态光场的量子特性  

Quantum properties of binomial state field interacting with the cascade three-level atom

作　　者：丛红璐[1] 赵玉娜[1] 陈雷[1] 王林杰[1] 任学藻[2] CONG Honglu;ZHAO Yuna;CHEN Lei;WANG Linjie;REN Xuezao(Haibin College,Beijing Jiaotong University,Huanghua 061199,China;School of Science,Southwest University of Science and Technology,Mianyang 621010,China)

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：《量子电子学报》2020年第1期76-82,共7页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金,11804136;河北省高等教育教学改革与实践项目,2018GJJG649;河北省实验教学示范中心建设项目。

摘　　要：在非旋波近似下,精确求解了级联型三能级原子与单模二项式态光场作用量子系统的能谱和二阶相干度.利用保真度对能级的交叉问题进行了讨论,研究了二项式态光场参数η及原子初始能级的叠加对光场二阶相干度的影响.结果表明:随着光场参数η的增大,聚束效应持续时间逐渐减小;由于原子能级的叠加导致光场反聚束效应持续时间减少,无论初始时刻原子是否处于叠加态,当η的数值较大时,光场都将完全呈现反聚束效应;此外,由于非旋波项产生的虚光子效应,二阶相干度演化曲线出现小锯齿状振荡.The energy spectrum and second-order coherence degree of a cascade three-level atom interacting with a single mode binomial state field are calculated accurately in the non-rotating wave approximation.The level-crossing problem is discussed by using fidelity.The influences of the binomial state field parameter η and superposition of atomic energy levels at the initial time on the second-order coherence degree are studied.Results indicate that the duration of the bunching effect decreases gradually with the increase of light field parameter η.The duration of the light field antibunching effect decreases due to the superposition of atomic energy levels.Whether the atom is in superposition state or not at the beginning time,the light field displays antibunching effect completely when the value of η is big enough.Because of the virtual photon effect induced by non-rotating wave approximation,the little indentation oscillation appears in the second-order coherence degree evolution curves.

关 键 词：量子光学 能谱 保真度 反聚束效应 非旋波近似 

分 类 号：O431.2[机械工程—光学工程]