Eur. Phys. J. D 23, 155-165 (2003)
https://doi.org/10.1140/epjd/e2003-00011-3

Engineering entanglement of a general three-level system interacting with a correlated two-mode nonlinear coherent state

¹ Mathematics Department, Faculty of Science, South Valley University, 82524 Sohag, Egypt
² Mathematics Department, Faculty of Science, Al-Azhar University, Naser City, Cairo, Egypt

Corresponding author: ^a abdelaty@uni-flensburg.de

Received: 29 July 2002
Revised: 18 October 2002
Published online: 21 January 2003

Abstract

In this article a treatment of a three-level atom interacting with two modes of light in a cavity with arbitrary forms of nonlinearities of both the fields and the intensity-dependent atom-field coupling is presented. A factorization of the initial density operator is assumed, with the privileged field modes being in a pair-coherent state. We derive and illustrate an exact expression for the time evolution of the density operator, by means of which we identify and numerically demonstrate the region of parameters where significantly large entanglement can be obtained. We show that entanglement can be significantly influenced by different kinds of nonlinearities. The nonlinear medium yields the superstructure of atomic Rabi oscillation. We propose a generation of Bell-type states having a simple initial state preparation of the present system.