Robust entanglement generation by reservoir engineering

TL;DR

This paper discusses a method for creating stable entanglement between atomic ensembles using engineered dissipation, enhanced by measurements to improve robustness against noise.

Contribution

It extends previous work by combining dissipative entanglement generation with measurement techniques, significantly improving entanglement quality under noisy conditions.

Findings

Entanglement can be maintained for over an hour in macroscopic ensembles.

Measurement-assisted methods enhance entanglement robustness against noise.

Theoretical extension supports experimental feasibility.

Abstract

Following a recent proposal [C. Muschik et. al., Phys. Rev. A 83, 052312 (2011)], engineered dissipative processes have been used for the generation of stable entanglement between two macroscopic atomic ensembles at room temperature [H. Krauter et. al., Phys. Rev. Lett. 107, 080503 (2011)]. This experiment included the preparation of entangled states which are continuously available during a time interval of one hour. Here, we present additional material, further-reaching data and an extension of the theory developed in [C. Muschik et. al., Phys. Rev. A 83, 052312 (2011)]. In particular, we show how the combination of the entangling dissipative mechanism with measurements can give rise to a substantial improvement of the generated entanglement in the presence of noise.