Quantum entanglement enhanced in hybrid cavity–magnon optomechanical systems

Abstract

We propose a hybrid cavity–magnon optomechanical system incorporating mechanical nonlinearity to enhance both bipartite and tripartite entanglement. This system consists of a microwave cavity, a YIG sphere, and a mechanical oscillator. Our findings demonstrate a significant amplification of both bipartite and tripartite entanglement by exploiting the advantages offered by mechanical nonlinearity. Additionally, the entanglement generated by this system exhibits superior temperature robustness compared to conventional ones. Moreover, we determine the optimal parameters of the system that yield maximum bipartite entanglement through rigorous calculations. A big feature to distinguish our proposal from others is the separation of phonon and magnon, and the other one is the use of mechanical nonlinearity to enhance entanglement, which may facilitate quantum precision measurements and quantum communication capabilities.

Keywords

• Hybrid cavity–magnon optomechanical system
• Bipartite entanglement
• Tripartite entanglement
• Microwave cavity QED
• Temperature robustness
• YIG sphere