双原子与光场依赖强度耦合相互作用的保真度  

Fidelity of two atoms interacting with light field via intensity-dependent coupling

作　　者：王菊霞[1] 

机构地区：[1]渭南师范学院物理与电气工程学院,光量子信息工程中心,陕西渭南714000

出　　处：《激光杂志》2012年第6期4-6,共3页Laser Journal

基　　金：渭南市自然科学基础研究项目(2012KYJ-2);陕西省自然科学基金项目(SJ08A25);陕西省军民融合研究基金项目(11JMR01);渭南师范学院培育项目(11YKP015)

摘　　要：利用全量子理论,采用数值计算方法,在考虑依赖强度耦合以及原子之间存在耦合的情况下,研究了双原子与光场的相互作用时光场的保真度的演化过程。结果表明:光场保真度与光场的初始光强、光场-原子的耦合系数、原子-原子之间的耦合强度等因素密切相关,这些因素的影响导致光场的保真度具有振荡性;通过适当控制,如果能使光场初始光强较弱或者原子-原子的耦合较强,将有利于提高光场保真度;当初始光强或者原子-光场的耦合越强,光场的保真度变化越快、规律性也越明显,强场或原子之间的强耦合时还呈现出坍塌-恢复现象;光场与原子的强耦合会使光场保持较稳定状态。The evolution of quantum information of light field fidelity in the percedure interaction between two atoms and light field under considering atom- atom coupling and intensity - dependent coupling are investigated by mean of full quantum theory and numerical computation method. The results show that the light field fidelity relates closely with intensity of initial light field, coefficient of field - atom coupling, and coefficient of atom- atom coupling. The influence of these factors leads to fidelity oscillation. It is advantageous of improving the hght field fidelity if controlling and making intensity of light weak and atom - atom coupling strong. The more stronger initial light intensity or atom- field coupling, the faster the frequency of light field fidelity and the more obvious varying regularity. The fidelity present also collapse- revert when initial light intensity or atom- atom coupling is strong. The light field could keep steady state during strongly coupling between atom and light field.

关 键 词：光量子信息学 全量子理论 依赖强度耦合 保真度 

分 类 号：O431.2[机械工程—光学工程]