Entanglement for a Bimodal Cavity Field Interacting with a Two-Level Atom

Details Entanglement for a Bimodal Cavity Field Interacting with a Two-Level Atom Entanglement for a Bimodal Cavity Field Interacting with a Two-Level Atom

2009-05-30

arxiv.org/abs/0906.0053v1

Physics

Quantum Physics

Accepted by Commun. Theor. Phys

Scientific paper

Negativity has been adopted to investigate the entanglement in a system composed of a two-level atom and a two-mode cavity field. Effects of Kerr-like medium and the number of photon inside the cavity on the entanglement are studied. Our results show that atomic initial state must be superposed, so that the two cavity field modes can be entangled. Moreover, we also conclude that the number of photon in the two cavity mode should be equal. The interaction between modes, namely, the Kerr effect, has a significant negative contribution. Note that the atom frequency and the cavity frequency have an indistinguishable effect, so a corresponding approximation has been made in this article. These results may be useful for quantum information in optics systems.

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