Research On Photon Blockade Effect In Double-cavity QED System

As information carrier,photon plays an important role in quantum information processing and quantum communication.The application of quantum information processing and quantum communication is realized by the effective regulation of photon blockade effect.The preparation of single photon source is of great significance in theory,experimental research and practical application.Therefore,how to find a reasonable physical system to effectively realize the regulation of single photon source is very important.Due to the obvious advantages of cavity QED system,it has been widely concerned.In this paper,two schemes are proposed to realize the single photon blockade effect:In the first scheme,we consider a hybrid double-cavity QED system,calculate the second-order correlation function of the photon by using the approximate analytic method of Schrodinger equation and the numerical simulation method,and analyze the statistical characteristics of the photon in the cavity.The results show that a better photon blockade effect can be obtained by decreasing the effective decay rate of the auxiliary cavity and increasing the coupling strength between the cavity field and the two-level atom.The second scheme studies the nonlinear properties of PT symmetric coupled cavity QED optical system.We calculate ideal photon blockade effect corresponding optimum parameter conditions by the method of analytic solution.Furthermore,we can achieve a better photon blockade effect by manipulating the gain of active cavity,the coupling strength between active and passive cavity,Kerr medium coefficient,the interaction between the passive cavity and an atom.The photon blockade effect can be obtained in both of the proposed schemes.In addition,we have the advantage of using the interference effect of auxiliary cavity and the regulation of related system parameters to achieve better photon blockade effect.It is worth noting that these system parameters are easy to control experimentally.Therefore,the proposed scheme provides a reliable platform for the preparation of adjustable single photon sources.