Enhancing entanglement and steering in a hybrid atom–optomechanical system via Duffing nonlinearity  

作　　者：Ling-Hui Dong Xiao-Jie Wu Cheng-Hua Bai Shao-Xiong Wu 董凌晖;武晓捷;白成华;武少雄

机构地区：[1]School of Semiconductor and Physics,North University of China,Taiyuan 030051,China

出　　处：《Chinese Physics B》2025年第2期124-131,共8页中国物理B(英文版)

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 12204440);Fundamental Research Program of Shanxi Province (Grant Nos. 20210302123063 and 202103021223184)。

摘　　要：We introduce a novel scheme for achieving quantum entanglement and Einstein–Podolsky–Rosen(EPR) steering between an atomic ensemble and a mechanical oscillator within a hybrid atom–optomechanical system. The system comprises an optical cavity, a two-level atomic ensemble and a mechanical resonator that possesses Duffing nonlinearity. The interaction between these components is mediated by the cavity mode, which is driven by an external laser. Our findings indicate that optimizing the coupling strengths between photons and phonons, as well as between atoms and the cavity,leads to maximal entanglement and EPR steering. The amplitude of the driving laser plays a pivotal role in enhancing the coupling between photons and phonons, and the system maintains robust entanglement and EPR steering even under high dissipation, thereby mitigating the constraints on initial conditions and parameter precision. Remarkably, the Duffing nonlinearity enhances the system's resistance to thermal noise, ensuring its stability and entanglement protection. Our analysis of EPR steering conditions reveals that the party with lower dissipation exhibits superior stability and a propensity to steer the party with higher dissipation. These discoveries offer novel perspectives for advancing quantum information processing and communication technologies.

关 键 词：quantum entanglement EPR steering optomechanical system Duffing nonlinearity 

分 类 号：O41[理学—理论物理]