The Entangled Properties In The Interaction Between Two-mode Squeezing Vacuum State Field And Entangled Atoms

Entangled states are very important topics in quantum optics, which attract huge interest nowadays. Light field at the two-mode squeezing vacuum state has the dominant property in the entanglement between the two modes. Theoretically, such light field can be used as information carrier in quantum teleportation. In this paper, by using the J-C Model, we study the interaction of entangled atoms with the light field at the two-mode squeezing vacuum state, and discuss the entangled properties of the system influenced by the rotation angleθoutside the cavity and the phase(?) in the two-atom state.The rotation angleθand the phase(?) do not destroy the periodicity of the entanglement between the atom and the cavity as well as the two modes of the cavity. When the phase(?) is certain, the rotation angleθplays an important role in the entanglement between the atom and the cavity as well as the two modes. With the increase of the rotation angleθ, the maximum of the entanglement between atom and cavity reduces while the minimum of the entanglement between the two modes of the cavity increases. When (?) =0, by choosing the proper rotation angleθ, the atom and the cavity can be disentangled and the entanglement between the two modes of the cavity becomes a constant. When the rotation angle isθ≠nπ/ 2, the phase (?) has great influence on the entanglement of the atom and the cavity as well as the two modes. With the increase of the rotation angleθ, the maximum of the entanglement between the atom and the cavity increases while the minimum of the entanglement between the two modes of the cavity decreases. When the maximum of the entanglement between the atom and the cavity becomes smaller (or the minimum of the entanglement between the two modes becomes larger), the influence is enhanced.