双二能级原子与少光子数叠加态腔场耦合中的量子失协  

Quantum Discord in the System of Two Two-Level Atoms Interacting with Few-Photon Superposition States Cavity

作　　者：卢道明[1] 

机构地区：[1]武夷学院机电工程学院,福建武夷山354300

出　　处：《激光与光电子学进展》2015年第2期242-249,共8页Laser & Optoelectronics Progress

基　　金：福建省自然科学基金(2011J01018)

摘　　要：研究了双两能级原子与少光子数叠加态腔场共振相互作用系统中两原子间的量子失协。利用数值计算方法,给出了不同原子间耦合强度情况下量子失协的演化曲线,讨论了该耦合系数对原子间量子失协演化的影响。研究发现:随耦合系数的逐渐增大,原子间量子失协演化从不规则振荡转变为准周期性演化;随耦合系数的增大,量子失协的峰值和曲线重心时而增大时而减小。这表明量子失协与耦合系数间存在非线性关系。The geometrical quantum discord（GQD） between two atoms in the system of two two-level atoms interacting with few- photon superposition states cavity is studied. The evolution of GQD under different coupling strengthes between atoms is given by the numerical method. The influences of coupling constant between atoms on GQD are discussed. The results show that the evolution regularity of GQD between atoms displays from irregular oscillation to periodicity evolution with the increase of the coupling constant. On the other hand, the peak and average of GQD sometimes increase and sometimes decrease. It shows that there is a nonlinear relationship between GQD and the coupling constant.

关 键 词：量子光学 二能级原子 少光子数叠加态 几何量子失协 

分 类 号：O431.2[机械工程—光学工程]