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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Entanglement in nondegenerate two-photon Tavis-Cummings model with atomic coherence

Eugene K. Bashkirov, Michael S. Mastuygin

Published Feb 26, 2013• 1 citation
Publisher

Abstract

The entanglement of two dipole-coupled atoms with nondegenerate two-photon transitions interacting with twomode field in lossless cavity has been investigated. It shows that the entanglement is dependent on the initial atomic states. The possibility of considerable growth of atomic entanglement due atomic coherence and dipoledipole interaction is shown in the case of great mean values of thermal photons.

DOI
10.1117/12.2019028

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The entanglement of two dipole-coupled atoms with nondegenerate two-photon transitions interacting with twomode field in lossless cavity has been investigated. It shows that the entanglement is dependent on the initial atomic states. The possibility of considerable growth of atomic entanglement due atomic coherence and dipoledipole interaction is shown in the case of great mean values of thermal photons.
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An exact solution of the problem of two two-level atoms with nondegenerate two-photon transitions and intensitydependent coupling interacting with two-mode radiation field is presented. Asymptotic solution for system state vector is obtained in the approximation of large initial coherent fields. The atom-field entanglement is investigated on the basis of the reduced atomic entropy dynamics. The possibility of the system being initially in a pure disentangled state to revive into this state during the evolution process is shown. Conditions and times of disentanglement are derived.
In this paper we have investigated the dynamics of entanglement of two natural or artificial two-level atoms interacting through multiphoton transitions with a thermal field of an lossless microwave cavity. On the basis of the exact solution of the model under consideration, the atom-atom entanglement parameter for various initial separable and entangled states of atoms are found. It is shown that the interaction of atoms with the thermal field of the cavity by means of multiphoton transitions can induce entanglement for all states except for the one in which both atoms are excited. It is also established that for the initial separable states of atoms the maximum degree of entanglement increases with the multiplicity of atomic transitions.