The Quantum Properties And Quantum Fidelity In A System Of Atom Interacting With NCS State And Other Superposition State Light Field

In quantum optics,people study the non-classical effectsin a system of an atom interacting with the constructed light fields and obtained a variety of fundamental results.The NCS(the number-chaotic state)state field and the Glauber-Lanchs state field are two kinds of the typical constructed light field.In this paper,westudiesthe quantum properties in the system of an atom interacting with NCS state fieldor the Glauber-Lanchs state field.Based on the fullquantum theory and numerical analysis method,the quantum fidelity and other quantum propertiesin the system of a two-level atom interacting with the NCS state lightor Glauber-Lanchs statelight via a multi-photon transition are investigated.The content of the paper is as follows.In the first chapter,the concept of the Glauber-Lanchs state light and the NCS state light field is briefly introduced.And the definitions of the fidelity of the quantum state,the bunching,antibunching effect of the optical fieldand the atomic inversion are presented.In chapter 2,the fidelityfor the interaction system of a moving two-level atom interacting with a number-chaotic state(NCS)light via a multi-photon transition is studied.The influence of atomic initial state and the parameters,including field-mode structure parameter,the average photon number of the chaotic state,the photon number of the number state and the transitional photon numberon the fidelity of the system are analyzed.The results show that the field-mode structure parameter effects the oscillation period of the fidelity.The average photon number of the chaotic state are correlated with value of the fidelity.The fidelity presents different patterns when atomic initial state,the photon number of the number state and transitional photon numbers are at some fixed values.In chapter 3,the bunching and antibunching effect of the optical field in a system ofa moving two-level atom interacting with a number-chaotic state(NCS)light via a multi-photon transitionis discussed.The influence of atomic initial state and the parameters,including photon number of the number state,the average photon number of the chaotic state,the transitional photon numberand the field-mode structure parameteron the bunching and anti-bunching of the optical field are analyzed.The results show that atomic initial state and average photon number of the chaotic state affect the amplitude of the antibunching effect.The field-mode structure parameter is correlated with the oscillation period and form of the antibunching effect.When the photon number of the number state and transitional photon number are at different values,the evolution curves of the antibunching effect have different manners.In chapter four,the atomic inversion in the system of a moving two-level atom interacting with a Glauber-Lanchs state light via a multi-photon transition is studied.The influence of atomic initial state and the parameters,including average photon number of the chaotic state,the field-mode structure parameter,the mean number of the coherent photons and the transitional photon number on the atomic inversion of the system are analyzed.The results show that the field-mode structure parameter affects the oscillation period and amplitude of the inversion.The atomic initial state and average photon number of the chaotic state are related to the oscillation amplitude of the inversion.In the case that different mean number of the coherent photons and transitional photon number were selected,different patterns of the atomic inversion of the system are exhibited.The summary of the paper is given in chapter five.