2个二能级原子与最小热环境作用系统中的量子特性  

Quantum Properties in a System of Two Interacting Atoms with a Minimal Thermal Environment

作　　者：朱冬梅 萨楚尔夫[1] 苏少龙[1] ZHU Dongmei;SACHUERFU;SU Shaolong(College of Physics and Electronie Information,Inner Mongolia Normal University,Inner Mongolia Hohhot 010022,China)

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：《河北师范大学学报（自然科学版）》2022年第4期342-351,共10页Journal of Hebei Normal University：Natural Science

基　　金：内蒙古自治区自然科学基金(2019MS03024);内蒙古师范大学“十百千”人才基金(RCPY-2-2012-K-038)。

摘　　要：利用全量子理论研究了2个二能级原子与单模热场相互作用的简单模型(其中一个原子是孤立的,另一个原子与单模热场相耦合,该热场为一个小微外环境),通过对该模型进行精确求解,探究小微外环境对2个相互作用二能级原子系统量子特性的影响.通过研究量子纠缠和相干特性的时间演化,讨论了相关耦合常数及环境有效温度对有关物理量演化的影响.结果表明:这一系统中,可观察到2原子间量子纠缠的突然死亡和再生的现象,分别对应弱耦合及强耦合情况,当平均光子数不同时,相干性及原子的线性熵随时间变化呈现不同的演化规律.By using fully quantum theory,a single model of the interaction between two two-level atoms and a single-mode thermal field are investigated.One atom is isolated and the other is coupled with the single-mode thermal field,and the thermal field is a small external environment in this simple model.By accurately solving the model,the influence of the small external environment on the quantum characteristics in a system of two interacting two-level atomic systems is analyzed.The time evolution of quantum entanglement and coherence in the considered system is presented.The effects of the correlation coupling constant and the ambient effective temperature on the time evolution of the relevant physical quantities are discussed.The results show that the sudden disapperance and regeneration of quantum entanglement between two atoms in the system can be observed.When the average photon number takes different values,the coherence and atomic linear entropy also show different evolution laws with time corresponding to weak and strong couplings,respectively.

关 键 词：热环境 量子纠缠 量子相干 线性熵 

分 类 号：O431.2[机械工程—光学工程]