Regular Article

Enhanced tripartite entanglement via atomic coherence in atom-optomechanical system

¹ Department of Physics, Shanghai University, Shanghai, P.R. China
² School of Science, Nantong University, Nantong, P.R. China
³ Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai, P.R. China

^a e-mail: yangxh@shu.edu.cn

Received: 10 August 2019
Received in final form: 22 October 2019
Published online: 26 November 2019

Abstract

We present a scheme to greatly enhance tripartite entanglement in an atom-optomechanical hybrid system driven by a single input laser field. The enhancement of the tripartite entanglement among two longitudinal cavity modes and a mirror oscillation mode is realized via atomic coherence when the cavity free spectral range is about equal to twice the frequency of mechanical oscillation and both cavity modes are blue-detuned by the mechanical frequency to the respective atomic resonant transitions while keeping the two-photon resonance satisfied. Moreover, the entanglement between the two cavity modes exhibits robustness to the variation of the environment temperature. The present atom-assisted optomechanical system provides an alternative platform for the quantum state exchange between light and light, as well as light and matter.