原子与双模腔相互作用系统中光场的量子特性

研究双模间存在耦合情况下,二能级原子与双模腔场相互作用系统中光场的压缩效应、反聚束效应和亚泊松分布等量子特性。通过对两模间耦合系数取不同值时Mandel Q函数演化曲线的比较,讨论了两模间耦合系数对光子统计分布的影响。研究结果表明,光场呈现出反聚束效应和亚泊松分布,以及两模间呈现反关联等量子特性,但光场不呈现压缩效应;另一方面,随两模间耦合系数的增大,光场的亚泊松分布效应减弱。

Quantum properties in the system of atom interacting with two-mode cavity

We consider the system which is composed of a two-level atom and a tw o-mode cavity,and two modes are coupled in the cavity.The evolution of the stat e vector of the system is given.The squeezing,antibunching effect and the photon number statistical dist ribution of two-mode field are investigated.First,through calculating the fluct uations of two quadrature components of the field,we get that a-mode and b-mode of two-mode field do not both display squeezing.Second,by calculating second-order correlation function of two-mod e field,the results show that a-mode and b-mode o f two-mode field both display antibunching effects, and there is anti-correlation between the two modes.Third,by means of the numerical calculat ions,we plot evolution curves of Mandel Q function for different values of the coupling const ants between two modes.Through comparing these curves,the influence of coupling constant betwe en two modes on the photon number statistical distribution of the field is discussed.The evo lution curves of Mandel Q function show that the two-mode cavity field displays sub-Poisson dis tribution.Moreover,the sub-Poisson distribution is weakened with increasing of the coupling constant between two modes.