The Influences Of Virtual Photon Process And Kerr Effect On Quantum Dynamics Of The T-C Model

In this paper,the nonclassical properties of two two-level atoms interacting with a single mode light field is studied by means of the quantum theory without rotating wave approximation;the influences of the yirtual photon process on the mean photon number,the degree of second order coherence of field,the evolution of the field entropy and the squeezing effect are also discussed. It has been shown that:the little indentation which represents the quantum noise of the system appears in the evolution curves;the quantum noise which is caused by virtual photon field gradually becomes weak when w increases,the quantum noise increases when n increases;the virtual photon process make the antibunching effect strengthen,make the squeezing degree deepen obviously,and lead to the additional vibration of entropy,the oscillation extent of the additional vibration of entropy increases when n increases and decreases when co or g increase .Besides,the quantum dynamics of two coupling atoms interacting with a single mode light field in a Kerr medium is studied in this paper;the influences of the Kerr effect on the mean photon number,the degree of second order coherence of field,the evolution of the field entropy and the squeezing effect are also discussed. It has been shown that:with the increase of the Kerr medium intensity parameter u,the Rabi oscillation extent of the mean photon number decrease and the Rabi oscillation frequency becomes rapid,the antibunching effect becomes strengthened;with the increase of n,the interaction between the field and atoms gradually becomes weak,however,the interaction between the field and the Kerr medium gradually becomes strengthened and happen in advance;with the increase of the coupling constants of two atoms,the Rabi oscillation extent of the mean photon number decrease and the Rabi oscillation frequency becomes rapid too,the antibunching effect becomes weak . It has also been shown that:the Kerr medium and the interaction of atoms will influence the periodicity of the evolution of the field entropy,make the connected degree between field and atoms weaken;the excited field intensity n also influence the periodicity of the evolution of the field entropy,the connected degree between field and atoms is strengthened first and is weakened later when n increases . Compared with the results of Jaynes-Cummings model,the squeezing effect of single photon Tavis-Cummings model show some new characters .