Fidelity of quantum information for V-type three-level atom interacting with the two-mode odd-even entangled coherent field

Based on quantum information theroy, the evolution characteristics of the fidelity for a V-type three-level atom interacting with the two-mode odd-even entangled coherent field are investigated. The influences of the detuning parameter, the two-mode light field intensity, the initial atomic state and the degree of the entanglement for the entangled two-mode fields on the fidelity of quantum information are discussed by using numerical method. The results show that the evolution frequencies of the fidelities are modulated by the detuning parameter. The nature of fidelity for the atom is better than that for the system or the field. The increasing of the detuning parameter or the field intensity can be a good help for the increasing of the fidelity of the atom. And it is much better when the atom is initially in the ground state.