内禀退相干对光场量子统计性质的影响  

Influence of intrinsic decoherence on the quantum statistical properties of light field

作　　者：谭霞[1] 张成强[2] 

机构地区：[1]山东师范大学物理与电子科学学院,山东济南250014 [2]山东教育学院,山东济南250013

出　　处：《量子电子学报》2008年第3期340-345,共6页Chinese Journal of Quantum Electronics

摘　　要：通过求解系统的Milburn方程,研究了两能级原子与双模SU(1,1)相干态光场相互作用系统的量子统计性质,分析了内禀退相干、双模光子数差和平均光子数对量子统计性质的影响。结果表明,内禀退相干增强了光场两模的聚束效应和模间相关程度,并使第一模始终处于亚泊松分布;存在内禀退相干时,场的二阶相干度仍具有明显的崩塌-回复现象,随着时间的演化,光场第一模处于亚泊松分布,光子呈现反聚束效应,光场两模间呈正相关,且为非经典相关,而在大部分时间区域,光场第二模处于泊松分布,光子呈现聚束效应。The quantum statistical properties in the system of a two-mode SU （1,1） coherent field interacting with a two-level atom are investigated by solving Milburn equation. The effects on the quantum statistical properties induced by the intrinsic decoherence, the two-mode photon number and the mean photon number are analyzed. The results show that the intrinsic decoherence strengthens the anti-bunching effect of the two-mode and the correlation intensity between the two modes and makes the first mode of the field always to be sub-Poissonian. The second-order coherence degree of the two-mode field also exhibits obvious collapserevival effect with the intrinsic decoherence. The first mode of the field is sub-Poissonian with the evolution of the time. The photon anti-bunching appears and the correlation between the two modes of light is both positive and non-classical. But in most of the time, the second mode of the field is Poissonian with the evolution of the time and the photon bunching appears.

关 键 词：量子光学 量子统计性质 Milburn理论 SU(1 1)相干态 

分 类 号：O431.2[机械工程—光学工程]