NPS态光场与运动二能级原子相互作用系统的保真度  

Fidelity in a System of a Moving Two-level Atom Interacting with Intermediate Number-Phase State Light

作　　者：郭彩丽[1] 萨楚尔夫[1,2] 李斌[1] 

机构地区：[1]内蒙古师范大学物理与电子信息学院,呼和浩特010022 [2]内蒙古师范大学图书馆,呼和浩特010022

出　　处：《光子学报》2016年第3期78-84,共7页Acta Photonica Sinica

基　　金：内蒙古自然科学基金项目(No.2013MS0115);内蒙古师范大学"十百千"人才基金项目(No.RCPY-2-2012-K-038)资助~~

摘　　要：利用全量子理论计算方法,研究NPS态光场与运动二能级原子相互作用系统和光场保真度的时间演化规律,分析原子初态、最大光子数、光场参量、原子运动速度、场模结构参量和跃迁光子数对系统和光场保真度的影响.结果表明:最大光子数越大或光场参量越小,保真度平均值越低;原子运动速度或场模结构参量增大保真度变大,振荡频率加快;跃迁光子数增大时,保真度周期性或无规则振荡;当原子初态处于叠加态时系统和光场保真度最大,且振荡规律相同.The fidelity in a system composed of a moving two-level atom interacting with an intermediate number-phase state was studied by means of the fully quantum theory.The influences of the atomic initial state,the largest number of photon,the parameter of light field,atomic motion,the parameter of field mode and the values of the transitional photon number on the fidelity of the system were analyzed.The result shows that the values of the average fidelity of system and light field decrease via increasing the largest number of photon or reducing the parameter of field.The larger atomic motion or field-mode structure parameter becomes,the greater values of the fidelity of system and light field are,and their oscillating frequencies are faster.As the transitional photon number is at different value,the evolutions for the fidelity of system and light field show periodic or random oscillation behavior.When atom is initially in a superposition state,the fidelity of system and field reaches its maximum,and the oscillating forms of the fidelity of system and field keep at a same manner.

关 键 词：量子光学 量子信息 NPS态光场 保真度 二能级原子 

分 类 号：O431.2[机械工程—光学工程]