Hybrid Cavity-Magnon Optomechanics: Tailoring Bipartite and Tripartite Macroscopic Entanglement

TL;DR

This paper proposes a hybrid cavity-magnon optomechanical system capable of generating and controlling diverse bipartite and tripartite macroscopic quantum entanglement, with tunable and robust features against environmental effects.

Contribution

It introduces a novel hybrid system combining cavity optomechanics and magnons to achieve tunable and robust multipartite entanglement, expanding quantum control possibilities.

Findings

Tunable bipartite and tripartite entanglement can be realized.

Entanglement is enhanced by engineering magnon-photon coupling.

Entanglement remains robust against bath temperature variations.

Abstract

Cavity optomechanics, providing an inherently nonlinear interaction between photons and phonons, have shown enomerous potential in generating macroscopic quantum entanglement. Here we propose to realize diverse bipartite and tripartite entanglement in cavity-magnon optomechanics. By introducing magnons to standard cavity optomechanics, not only tunable optomechanical entanglement and magnon-magnon entanglement can be achieved, but also flexible tripartite entanglement including magnon-photon-phonon entanglement, magnon-magnon-photon and -phonon entanglement can be generated. Moreover, optimal bipartite and tripartite entanglement can be achieved by tuning parameters. We further show that all entanglement can be enhanced via engineering the magnon-photon coupling, and is proven to be robust against the bath temperature within the survival temperature. Besides, we find that the optomechanical entanglement can be protected or restored by bad magnons with large decay rate, while other entanglement is severely reduced. The results indicate that our proposal provides a novel avenue to explore and control tunable macroscopic quantum effects in hybrid cavity-magnon optomechanics.