Robust entanglement between a movable mirror and atomic ensemble and entanglement transfer in coupled optomechanical system

TL;DR

This paper presents a scheme to generate robust entanglement between a movable mirror and an atomic ensemble in a coupled optomechanical system, increasing the critical temperature for entanglement and enabling quantum information applications.

Contribution

The authors introduce a novel scheme that enhances the robustness of entanglement and raises the critical temperature compared to previous methods.

Findings

Critical temperature of entanglement increased to 32 K.

Entanglement transfer in the coupled system demonstrated.

Potential applications in quantum memories and displacement measurements.

Abstract

We propose a scheme for the creation of robust entanglement between a movable mirror and atomic ensemble at the macroscopic level in coupled optomechanical system. In experimentally accessible parameter regimes, we show that critical temperature of the bipartite continuous variable entanglement in our scheme can be raised from previous 24 K [Vitali {\it et al.}, Phys. Rev. Lett. \textbf{98}, 030405 (2007)] and 20 K [Genes {\it et al.}, Phys. Rev. A \textbf{77}, 050307(R) (2008)] to 32 K. We also investigate the entanglement transfer based on this coupled system. The scheme can be used for the realization of quantum memories for continuous variable quantum information processing and quantum-limited displacement measurements.