非旋波近似下级联型三能级原子与腔场相互作用的量子动力学性质

研究非旋波近似下级联型三能级原子与单模腔场的相互作用.结果表明：非旋波近似下，由于虚光场的影响，辐射场的平均光子数和二阶相干度的演化曲线均出现了“小锯齿状”，表现为系统的量子噪声，随着ω和的增大，量子噪声分别减小和增大；非旋波近似下，系统的反聚束效应较旋波近似的强；研究结果还揭示了平均光子数N(t)和二阶相干度g²(t)与原子-场耦合系数λ的关系. 关键词：

QUANTUM DYNAMICS OF A CASCADE THREE-LEVEL ATOM INTERACTING WITH COHERENT STATE IN THE COUNTER ROTATING WAVE APPROXIMATION

The dynamics of a cascade three-level atom interacting with the single mode coherent state under the Counter-Rotating-Wave approximation (C-RWA) is investigated.The properties of the mean-photon number (N(t)) and the degree of second-order coherence (g²(t)) are analyzed in this model.The little indentation which represents the quantum noise of the system appears in the evolution curves of the mean-photon number and the degree of second-order coherence under the C-RWA.The quantum noise which is caused by the virtual photon field gradually becomes weak when ω increases.The quantum noise increases when increases.The anti-bunching effect of the system under the C-RWA is stronger than the one under the RWA.Besides,the relation of N(t) and g²(t) with the atom-field coupling constant λ is revealed in our results.