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Journal of Huaiyin Institute of Technology

Atomic Linear Entropies of a Cascade Three-level Atom Interacting with Two-mode Phone Field

Jing Li

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

In this paper the author studies the time evolution of atomic linear entropies in the field-atom coupling system of a three-level atom interacting with two-mode photon field.The effect of the intensity coupling of field with the atom and the system's initial state on atomic linear entropies is also discussed.

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We investigate the evolution of the atomic quantum entropy and the atom–field entanglement in a system of a Λ-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 is assumed, considering the field to be initially in a non-correlated two-mode squeezed coherent or binomial state. The effects of the mean photon number, detuning, Kerr-like medium and the intensity-dependent coupling functional on the entropy are analysed.