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

Abstract

Cavity magnomechanics has become an ideal platform to explore macroscopic quantum effects. Bringing together magnons, phonons, and photons in a single physical system, it opens many opportunities for quantum technologies. It was conventionally realized by a yttrium iron garnet, which exhibits a linear 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 new cavity magnomechanical system with one of the cavity mirror formed by a 2D magnetic material. Its anisotropic magnetostrictive interaction induces a unique nonlinear phonon-magnon coupling $\hat{m}^\dag\hat{m}(\hat{b}^\dag+\hat{b})^2$. It is found that 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.Comment: 7 pages and 3 figures in the main text. 3 pages in the supplemental materia