Environment assisted entanglement enhancement

Abstract

We consider dissipative atom-cavity systems and show that their collective dynamics leads to the maximization of entanglement for intermediate values of the cavity leakage parameter $\kappa$. We discuss possible ways the reservoir influences entanglement. We first consider the entanglement of a single two-level atom with a microwave cavity that is coupled to another cavity. We show that the atom-cavity entanglement can be made to increase with cavity leakage. We next show that the entanglement between two atoms passing successively through a cavity can be maximised for intermediate values of $\kappa$. We finally consider the micromaser where the increase of two-atom entanglement for stronger cavity-environment coupling is demonstrated for experimentally attainable values of the micromaser parameters.

4 pages, Revtex, 1 eps figure; minor changes to match with published version

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• Control of a nonlocal entanglement in the micromaser via two quanta non-linear processes induced by dynamic Stark shift
• Berry phase in superconducting charge qubits interacting with a cavity field
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