Quantum Entanglement Research In The Dressed-state Laser And Frequency Mixing System

How to obtain the steady and bright source of entanglement is one of the impor-tant research fields in the quantum optics, In this paper, The entanglement proper-ties of two mode fields generated with the help of the auxiliary atomic transition by the Langevin. It is well known that four-wave mixing in a strongly driven two-level system can not generate bright entanglement source of light. and the atom is inter-acted resonantly with the driving field can not obtain the two-mode entanglement. For this purpose, make use of the auxiliary atomic transition method, consider an ensemble of V-type three-level atoms embedded in a two-mode optical cavity, The excited state to ground state is coupled by a strong laser field and metastable state to ground state is coupled by a weak laser field, consider the two-mode entanglement properties. It is revealed that:with the incoherent strength、the atomic decay rate diminish and the cooperation parameter enlarge, the two-mode entanglement can be enhanced, and not only generation entanglement but also obtain laser. when the atom is interacted with the strong driving laser field, with the Rabi frequency of the coherent driving field、the atomic detuning enlarge and the atomic decay rate dimish, the two-mode entanglement can be enhanced.