Entanglement In The Interaction Between Two-mode Squeezing Vacuum State Field And Moving-atom

Two-mode squeezing vacuum state has the predominant property in the entangle-ment of two modes, so in theory it can act as information carrier in quantumteleportation. But considering the real process of teleportation, there is interactionbetween field and environment, so the informations on the carrier are destroyed. Thephenomenon of decoherence will happen, which is not helpful for quantumcomputation and quantum teleportation. Therefore, it is necessary to investigate thecharacter of entanglement when field interacts with environment. In this article itstudies the interaction between two-mode squeezing vacuum state and environment (amoving two-level atom) by using generalized Jaynes-Cummings model. For thestandard J-C model is extended to include the motion of the atom and the structure offield , the interaction of field-atom is more level to real condition.In a word, considering the interaction between two-mode squeezing vacuum fiel-d and a moving two-level atom by two-photon process in quantum theory, weinvestigate the entanglement of the two-mode field and atom and the one of twomodes of field using the quantum reduced entropy and the quantum relative entropy,respectively. And discover that the two-mode field, it still has the better character ofquantum entanglement, choosing proper systematical parameter and interacting time.So it is important for quantum teleportation to come true, using two-mode squeezingvacuum state.