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Degree of Entanglement for a General Formalism Ξ–configuration Three-level Atom Interacting with a Two-mode Pair Coherent State in the Presence of Nonlinearities
A. A. Eied

We investigate the evolution of the atomic quantum entropy and the atom-field entanglement in a system of an Ξ-configuration three-level atom interacting with a two-mode field with additional forms of nonlinearities of both the field and the intensity-dependent atom-field coupling. With the derivation of the unitary operator within the frame of the dressed state and the exact results for the state of the system we perform a careful investigation of the temporal evolution of the entropy. A factorization of the initial density operator will be assumed, considering the field to be initially in a two-mode pair coherent state. The effects of the mean photon number, detuning, Kerr-like medium and the intensity-dependent coupling functional on the entropy will be analyzed.

Keywords: Entanglement, Quantum entropy

PACS: 42.65.Sf,03.65.Ud,03.67.Hk

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