两原子与两个单模腔场量子统计相干性质的研究  

Research on Quantum Statistics and Coherent Properties of Two Coupled Atom-Cavity Dissipative Systems

作　　者：张宇慧[1] 吕树臣[1] 

机构地区：[1]哈尔滨师范大学

出　　处：《哈尔滨师范大学自然科学学报》2013年第1期46-49,共4页Natural Science Journal of Harbin Normal University

摘　　要：采用量子主方程方法来研究由两个二能级原子与两个单模腔耦合的耗散系统.研究结果揭示了平均光子数、q因子以及二阶相关度在不同腔场衰减率k的条件下随时间的演化关系.在旋波近似下,二阶相干度的演化曲线呈现了"小锯齿状",表现为系统的量子噪声.并且随着腔场衰减率k的增大,量子噪声增大.结果还表明无论腔场衰减率取何值,腔场内的光子都先成亚泊松分布,最终趋于泊松分布.In this paper, the quantum master equation is used to study two two - level atoms with two single- mode cavity coupled dissipative system. The results reveal the mean photon number, q factor, and second- order degree of coherence followed the time evolution of the relationship under the conditions of different cavity field decay rate k. In the rotating wave approximation. The evolution curve of the second degree of coherence presents a ＂jagged＂ which represents the quantum noise of the system and quantum noise increases with the increase of the cavity field decay rate k. The results also show that no matter what value the cavity field decay rate, the photon inside the cavity first exhibits sub - poisson distribution, and ultimately tend to the poisson distribution.

关 键 词：量子数方程 原子-腔耦合 平均光子数 亚泊松分布 

分 类 号：O431.2[机械工程—光学工程]