Quantum Statistics And Coherent Properties Of Two Coupled Atom-cavity Dissipative Systems

In this paper, the quantum master equation of diatomic coupled system of twosingle-mode cavity field, through theoretical derivation, the nature of the researchfrom two different cavity field decay rate and the cavity field coupling coefficientatom-cavity constitutes a coupled system of quantum statistics coherent.First, we discuss the factor q calculated cavity field and cavity fieldsecond-order quantum coherence degree to study coherent nature of the atom-cavityquantum statistics of a coupled system. Unlike other studies, this article focuses onthe time evolution. Under conditions of equality and inequality in the cavity fielddecay rate, the time evolution of the mean photon number of the cavity field and qfactor were discussed. Studies have shown that, in two equal cavity field decay ratecase, cavity field mean photon number and q factor into opposite change over time.Gradually reduce the average number of photons in the cavity field on the basis ofgreater than zero, q factor is less than zero and this change is stable,light fieldrendering Sub-Poisson distribution, which reflects the effect of the non-classicallight. Under the conditions of the cavity field decay ratek1k2, significant changesin the decay rate of the cavity field. Curve presents a significant shock with timechanging, there has been a quantum noise which does not change the curve of theoverall. Light field is still first in the Sub-Poisson distribution of the final in thePoisson distribution. Light field changes from non-classical light to the classic lightconversion. And cavity field-cavity field coupling coefficient increases will weakenthe coupling between the atom-cavity.Next we discussed the cavity of the second-order quantum coherence of thetime evolution. Under the same conditions as in the cavity field decay rate,respectively, in the positive detuning and negative detuning, second-order degree ofcoherence of the time evolution. Under positive detuning conditions, with the cavityfield decay rate increasing, the quantum noise deepen, the photon number was in theSub-Poisson distribution state with anti-bunching. Under negative detuningconditions, collapse phenomenon occurred in the quantum at first. Subsequently the situation with positive detuning is the same. But when the cavity field decays rateand detuning, the curve apparent collapse of recovery phenomenon, light field is inthe Sub-Poisson distribution, the nature of the photon anti-bunching effect. Photonintensity showed a negative association; at this time of the light field is anon-classical light field. Under the negative detuning conditions, light field is in theSuper-Poisson distribution of photon bunching effect, the photon strength showed apositive association, when the light field is a classic light field.