Quantum Statistics And Coherent Properties Of A Coupled Single-atom Laser

This paper did a theoretical research of atom-cavity coupled based on quantum theory.It adopted Master Equation method as a math tool to conduct theoretical derivation.Mainly consider and atomic suffered vacuum damping rate changes two aspects to study non-classical nature of the atom-cavity coupling system with the applied coherent driving field changes in rotating wave approximation and antirotating wave approximationthis paper discussed about the atom-cavity coupled system's quantum statistical properties and coherent properties by calculating optical field's quantum degree of second order coherence and cavity field's the photon number distribution.Different from other researchers' previous discussions,this paper mainly focused on its time evolution of the process.First discussed separately in rotating wave approximation and antirotating wave approximation,atom by vacuum damping rate of change and the atom field coupling strength changes on cavity quantum statistics properties of the field and the coherence effects.The results show that,in the rotating wave approximation,cavity photon number presenting with Poisson distribution,the cavity field displays anti-bunching,embodies the quantized field non classical properties,in the rotating wave approximation condition,an atom in a cavity by ordinary vacuum damping different decay rate or the atom field coupling intensity under different at the time,infinite cavity field Nikai Ko correlation in steady value,with the atomic decay rate or the coupling strength increases,cavity field Nikai Ko correlation will decrease.Rotating wave approximation,atomic decay rate is higher or the coupling strength is greater,the cavity field demonstrated photon anti bunching of the more obvious.The rotating wave approximation by vacuum damping chamber within the atoms on photon attenuation and cavity field average photon number distribution play an inhibitory role.While the atom-field with different coupling strength on the cavity photon number distribution and average photon number effect is not obvious.Next is the study of antirotating wave approximation,atom by vacuum damping ratio change and atom-cavity coupling strength changes on the system study on the influence of quantum statistics and coherence.Research shows that antirotating wave approximation,intracavity photon number presenting with sub-Poissonian,the cavity field displays anti-cluster,Without rotating-wave cavity caused the quantum degree of second order coherence curve of "small jagged",reflecting the system of quantum noise,and under the rotating wave approximation "quantum noise" is not displayed.These phenomena reflect the antirotating wave approximation to the rotating wave approximation of the "ideal" correction.Antirotating wave approximation conditions,atomic suffered vacuum damping rate change,Time tends to infinity,quantum degree of second order coherence is in the steady value.With the atomic by damping rate increases,the cavity field of quantum degree of second order coherence and quantum noise showing decreases Atom-field coupling strength enhancement will the system show the anti-cluster play the role of a certain gain antirotating wave approximation demonstrated in the next coupling strength the greater the cavity field photon anti-cluster nature is more obvious,which on the contrary with the results in the rotating wave approximation.The antirotating wave approximation,the atomic suffered by ordinary vacuum of different decay rates or under the conditions of the atom-field coupling strength conditions,the light field of the photon statistical distribution and the mean photon number almost no impact.This is the case in the rotating wave approximation the opposite,the role of antirotating wave made atom in cavity by the vacuum damping of the photon statistics of the cavity field distribution play an inhibitory effective cancellation.