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Journal of Physics A Mathematical and General

Analytical treatment of W-state preparation in cavity QED in the presence of very weak dissipation

Changyong Chen, Kelin Gao, Mang Feng

Published Sep 5, 2006• 2 citations
Publisher

Abstract

We propose an analytical treatment method of generation of multipartite W-type states with a single-resonant interaction of the atoms with the cavity mode in cavity QED, under the consideration of very weak decay from the excited atomic level and from the cavity mode. By manipulating different coupling strengths between the atoms and the cavity mode, we show how to deterministically produce W states, including the standard W state and the one with arbitrary coefficients. The corresponding analytical expressions are given, indicating that the detrimental influence from the atomic spontaneous emission is three times that from the cavity decay. The experimental feasibility of our scheme is also discussed by using current cavity QED techniques.

DOI
10.1088/0305-4470/39/38/011

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We propose an analytical treatment method of generation of multipartite W-type states with a single-resonant interaction of the atoms with the cavity mode in cavity QED, under the consideration of very weak decay from the excited atomic level and from the cavity mode. By manipulating different coupling strengths between the atoms and the cavity mode, we show how to deterministically produce W states, including the standard W state and the one with arbitrary coefficients. The corresponding analytical expressions are given, indicating that the detrimental influence from the atomic spontaneous emission is three times that from the cavity decay. The experimental feasibility of our scheme is also discussed by using current cavity QED techniques.
We analytically investigate the generation of mesoscopic entanglement between deformed coherent states which result from the action of the non-standard displacement (displacement-like) operator on the cavity mode vacuum state, and between deformed coherent states and Fock states, based on a dissipative one-photon interaction of a two-level atom with single-mode cavities under strong driving fields. By using the quantum trajectory method and displacement-like operators, we analytically present the detrimental effect of the cavity decay on the generated states and briefly discuss the feasibility of experimental preparation of those states in cavity QED.
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