存在内禀退相干时薛定谔猫态光场中原子的布居数反转  

The Atomic Population Inversion in the System of Schrdinger Cat State Light Field interacting with a Two-level Atom under Intrinsic Decoherence Condition

作　　者：吴淑梅[1] 萨楚尔夫[1] 包丽[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）》2010年第1期40-44,共5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(2009MS0112);内蒙古高等学校科研基金项目(NJ03038)

摘　　要：通过求解系统的Milburn方程,研究了二能级原子与薛定谔猫态光场相互作用系统中原子的布居数反转.分析了内禀退相干、光场强度、相干态间的相位角对原子布居数反转的影响.结果表明,当存在内禀退相干时,原子布居数反转随着时间的演化,逐渐衰减为零.光场强度不变时,随着内禀退相干因子的减小,原子布居数反转衰减加剧,其中奇相干态光场中原子布居数反转的衰减速度较快;偶相干态光场中原子布居数反转的衰减速度较慢;Yurke-Stoler相干态光场中原子布居数反转的变化情形介于其中.内禀退相干因子不变时,随着光场强度的增加,出现崩塌-恢复现象,并且Rabi振荡的包络值很快衰减为零.The atomic population inversion in a system of a two-level atom interacting with the Schrdinger cat state light field was studied by solving the Milburn equation.The effect of intrinsic decoherence,the strength of light field and the phase angle between the two coherence states on atomic population inversion were analyzed.The results show that the atomic population inversion decreases to zero with the evolvement of time under intrinsic decoherence.The atomic population inversion damps strongly with the reducing of the intrinsic decoherence as the strength of light field is at a fixed value.The atomic population inversion decreases quickly in an odd coherent state but slowly in an even coherent state.The value of atomic population inversion in a Yurke-Stoler coherent state is between them.When the intrinsic decoherence keeps at the fixed level,the collapse and revival phenomena will be appear with the increase of the strength of light field.Rabi oscillation damps to zero faster.

关 键 词：量子光学 薛定谔猫态 光场强度 Milburn理论 布居数反转 

分 类 号：O431.2[机械工程—光学工程]