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Prog. Theor. Phys. Vol. 127 No. 4 (2012) pp. 631-643

[ Full Text PDF : FREE ACCESS (405K) ]

Quantum Decoherence and Entanglement Induced by Nonlinear Dissipative Environment

Hosny A. Hessian1, 2

1Faculty of Science, Assiut University, Assiut, Egypt
2Faculty of Science, Al-Baha University, Al-Baha, Saudi Arabia

(Received July 2, 2011; Revised February 10, 2012)

Abstract:

The analytical description of the dynamics of a nonlinear atom-field system described by a diagonal f-deformed Jaynes-Cummings model for a chosen initial state is obtained. The purity loss of the global system, and the atomic and field subsystems are discussed. Information on entanglement between the field and matter is studied by comparing the results for mutual entropy, which is a measure of the total correlation, and the negativity as a measure of the amount of entanglement. It is found that the nonlinearity of the dissipation tends to accelerate the decoherence of the global, field, and atomic states. In addition, we find that the so-called entanglement sudden death can occur when both of the nonlinearity couplings between the cavity field and the dissipation are combined.

Subject Index : 061
URL : http://ptp.ipap.jp/link?PTP/127/631/
DOI : 10.1143/PTP.127.631

[ Full Text PDF : FREE ACCESS (405K) ] Citation:

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