Magnonic entanglement in a chiral cavity-magnon coupling system

TL;DR

This paper proposes a novel chiral cavity-magnon system to generate entangled and squeezed magnon states, advancing quantum information processing without relying on weak magnon nonlinearities.

Contribution

It introduces a new scheme using a torus-shaped cavity and yttrium iron garnet spheres for magnon entanglement without Kerr nonlinearity dependence.

Findings

Bipartite entanglement can be tuned via external parameters.

The scheme achieves magnon squeezing and entanglement.

No reliance on weak magnon Kerr nonlinearity.

Abstract

The generation of magnon entanglement and squeezing plays a crucial role in quantum information processing. In this study, we propose a scheme based on a chiral cavity-magnon system, which consists of a torus-shaped cavity and two yttrium iron garnet spheres. The magnon mode of each yttrium iron garnet sphere is selectively coupled to one of the two degenerate rotating microwave modes of the toroidal cavity. The system aims to achieve entangled and squeezed magnon states through the mediation of the cavity. We further show that bipartite entanglement can be achieved by tuning external driving parameters. Additionally, our scheme does not rely on the magnon Kerr nonlinearity, which is usually extremely weak in yttrium iron garnet spheres. This work provides insights and methods for the research of quantum states in cavity-magnon systems.