压缩真空中三能级Λ型原子荧光光子关联  

Fluorescence Photon Correlation of a Three-LevelΛ-Type Atom in a Squeezed Vacuum

作　　者：石文星[1] 王飞[2] 

机构地区：[1]江汉大学物理科学与信息工程学院,湖北武汉430056 [2]三峡大学理学院,湖北宜昌443002

出　　处：《光学学报》2013年第12期262-266,共5页Acta Optica Sinica

基　　金：国家自然科学基金(11104163);三峡大学科学基金(KJ2011B019)

摘　　要：主要研究处于压缩真空中的Λ型三能级原子的荧光光子关联行为。利用约化密度矩阵方程和量子回归理论,理论计算并数值模拟了荧光场强度关联随时间的演化。结果表明,系统荧光光子的关联行为受到压缩真空的显著调制。当与原子相互耦合的场很弱时,压缩真空不改变荧光光子的关联行为,但缩短了反关联演化时间,并改变了原子的布居分布;然而,在强场耦合作用下,压缩真空破坏了系统的相干布居捕获条件,压缩真空和原子相干导致荧光光子的关联行为从强关联回到正常水平。The fluorescence photon correlation in a three-level Λ-type atom in a broadband squeezed vacuum is investigated. By using the equation for the reduced density operator and the quantum regression theorem, the dynamics of the intensity correlation and the evolution are numerically calculated. The results show that the behavior of the photon correlation can obviously be modified by the squeezed vacuum. When the coherent field is so weak that the atomic coherence is negligible, the anticorrelation is preserved and the time for evolving into normal case is reduced via squeezed vacuum, and the populations of different levels are changed. However, when a stronger coupling field is applied, the combination of atomic coherence and squeezed vacuum leads to the changing from strong photon correlation to normal photon correlation, attributing to that the coherent population trapping is spoiled by the squeezed vacuum.

关 键 词：量子光学 光子关联 压缩真空 三能级Λ型原子 

分 类 号：O431.2[机械工程—光学工程]