The Quantum Entanglement Properties Of The Atom Interacting With The Optical Field Through Resonance Raman Process

It is important that optical fields interact with atoms in quantum optics. In 1963,Jaynes and Cummings described a physical model of two-level atom and one modeoptical field named J-C model. Physicists do many studies and expansions. Theyassume that atom is still and only think of the inner interaction of atom with theoptical fields, a moving two-level atom interacting with two_mode field through resonanceRaman process are not investigated, we'll study it in this paper.In this article, we study the interaction between two-mode squeezing vacuumstate and a moving two-level atom by two-photon resonance Raman process inquantum theory. We shoud consider the motion of atom because it's a factualreason .We respectively investigate the entanglement of the two-mode field and atomand the one of two modes field using the quantum reduced entropy and the quantumrelative entropy and analysis the entropy properties in different state.We discover that when we don't consider the moving of atom , the quantumentanglement of atom and the two-mode field becomes high and keeps long at highsqueezing parameter r , also, when atom moves, it's the same result at low fieldparameter p and atom state parameter θ. So we can conclude that the two-mode fieldand the moving two-level atom, also with the moving two-level atom they still havethe better character of quantum entanglement, choosing proper systematical parameterand time. It is important to quantum entanglement in quantum .