Quantum-state engineering in cavity magnomechanics formed by two-dimensional magnetic materials

TL;DR

This paper proposes a novel cavity magnomechanical system using 2D magnetic materials that enables quantum-state engineering through coexisting photon-phonon and quadratic magnon-phonon couplings, leading to stable squeezing and entanglement.

Contribution

It introduces a new 2D magnetic material-based cavity magnomechanical system with unique interactions, enhancing quantum-state engineering capabilities.

Findings

Achieves stable phonon squeezing.

Generates bi- and tri-partite entanglement.

Operates without extra nonlinear interactions or reservoir engineering.

Abstract

Cavity magnomechanics has become an ideal platform to explore macroscopic quantum effects. Bringing together magnons, phonons, and photons in a system, it opens many opportunities for quantum technologies. It was conventionally realized by an yttrium iron garnet, which exhibits a parametric magnon-phonon coupling $\hat{m}^\dag\hat{m}(\hat{b}^\dag+\hat{b})$, with $\hat{m}$ and $\hat{b}$ being the magnon and phonon modes. Inspired by the recent realization of two-dimensional (2D) magnets, we propose a cavity magnomechanical system using a 2D magnetic material with both optical and magnetic drivings. It features the coexisting photon-phonon radiation-pressure coupling and quadratic magnon-phonon coupling $\hat{m}^\dag\hat{m}(\hat{b}^\dag+\hat{b})^2$ induced by the magnetostrictive interaction. A stable squeezing of the phonon and bi- and tri-partite entanglements among the three modes are generated in the regimes with a suppressed phonon number. Compared with previous schemes, ours does not require any extra nonlinear interaction and reservoir engineering and is robust against the thermal fluctuation. Enriching the realization of cavity magnomechanics, our system exhibits its superiority in quantum-state engineering due to the versatile interactions enabled by its 2D feature.