一种相干叠加态与二能级原子相互作用系统中场熵及反转粒子数的演化特性  

The Evolution Properties of the Field Entropy and the Population Inversion in An Interacting System of A Coherent Superposition State and A Two-Level Atom

作　　者：哈日巴拉[1] 萨楚尔夫[1] 杨瑞芳[1] 

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

出　　处：《内蒙古师范大学学报（自然科学汉文版）》2008年第5期632-637,共6页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60467002);内蒙古自然科学基金资助项目(200408020107)

摘　　要：研究了压缩相干态和真空态构成的相干叠加态光场与二能级原子相互作用系统中场熵的演化特性及粒子数反转效应,并与相干态和真空态构成的相干叠加态光场的场熵特性及粒子数反转效应进行了比较.研究结果表明,两种叠加态光场的场熵都随时间呈准周期变化,反转粒子数随着时间呈周期性的崩塌-复原变化,与相干态和真空态构成的相干叠加态相比,压缩相干态和真空态构成的相干叠加态与二能级原子的纠缠更强,反转粒子数随着时间变化所呈现崩塌-复原效应的周期变得更短.The evolution properties of the field entropy and the population inversion in an interacting system of a coherent superposition state and a two-level atom are studied and compared with that of the coherent superposition state formed by the coherent state and vacuum state. The result shows that the entropies of the two subsystems display quasi-periodicity with increasing time. The behaviors of collapse and revival of population inversion of the system are repeated with increasing time. Compared with the coherent superposition state of the coherent state and vacuum state, the quantum entanglement of the coherent superposition state of the squeezed coherent state and vacuum state becomes stronger and the periodicity of the population inversion becomes shorter with increasing time in the system.

关 键 词：压缩相干态 真空态 相干叠加态 场熵 粒子数反转 

分 类 号：O413.1[理学—理论物理]