Abstract
In this paper, we investigate the entanglement dynamics and decoherence in the interacting system of a strongly driven two-level atom and a single mode vacuum field in the presence of dissipation for the cavity field. Starting with an initial product state with the atom in a general pure state and the field in a vacuum state, we show that the final density matrix is supported on \({\mathbb C}^2\otimes{\mathbb C}^2\) space, and therefore, the concurrence can be used as a measure of entanglement between the atom and the field. The influences of the cavity decay on the quantum entanglement of the system are also discussed. We also examine the Bell-CHSH violation between the atom and the field and show that there are entangled states for which the Bell-BCSH inequality is not violated. Using the above system as a quantum channel, we also investigate the quantum teleportation of a generic qubit state and also a two-qubit entangled state, and show that in both cases the atom-field entangled state can be useful to teleport an unknown state with fidelity better than any classical channel.
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Akhtarshenas, S., Khezrian, M. Entanglement dynamics and decoherence of an atom coupled to a dissipative cavity field. Eur. Phys. J. D 57, 271–279 (2010). https://doi.org/10.1140/epjd/e2010-00025-8
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DOI: https://doi.org/10.1140/epjd/e2010-00025-8