Cooling atom-cavity systems into entangled states

TL;DR

This paper proposes an improved method for cooling atom-cavity systems into highly entangled states, achieving higher fidelities at lower cooperativity parameters without complex detection or addressing.

Contribution

It introduces an enhanced entanglement cooling scheme for two atoms in a cavity, surpassing previous fidelities with similar parameters and simplifying implementation.

Findings

Achieves fidelities above 90% at C as low as 20

Does not require individual laser addressing

Does not rely on photon detection

Abstract

Generating entanglement by simply cooling a system into a stationary state which is highly entangled has many advantages. Schemes based on this idea are robust against parameter fluctuations, tolerate relatively large spontaneous decay rates, and achieve high fidelities independent of their initial state. A possible implementation of this idea in atom-cavity systems has recently been proposed by Kastoryano et al. [Phys. Rev. Lett. 106, 090502 (2011)]. Here we propose an improved entanglement cooling scheme for two atoms inside an optical cavity which achieves higher fidelities for comparable single-atom cooperativity parameters C. For example, we predict fidelities above 90% even for C as low as 20 without requiring individual laser addressing and without having to detect photons.