Nonreciprocal Multipartite Entanglement in a two-cavity magnomechanical system

TL;DR

This paper proposes a theoretical scheme to generate nonreciprocal multipartite entanglement in a two-cavity magnomechanical system, highlighting the role of the self-Kerr effect and magnetic field tuning in achieving nonreciprocity.

Contribution

It introduces a novel method for creating nonreciprocal multipartite entanglement using a two-cavity YIG system with magnetic dipole interaction and Kerr effects, advancing quantum information applications.

Findings

Self-Kerr effect enhances multipartite entanglement.

Nonreciprocity arises when magnetic field is tuned along [110] axis.

Optimal system parameters control entanglement nonreciprocity.

Abstract

We propose a theoretical scheme for the generation of nonreciprocal multipartite entanglement in a two-mode cavity magnomechanical system, consisting of two cross-microwave (MW) cavities having a yttrium iron garnet (YIG) sphere, which is coupled through magnetic dipole interaction. Our results show that the self-Kerr effect of magnon can significantly enhance multipartite entanglement, which turns out to be nonreciprocal when the magnetic field is tuned along the crystallographic axis [110]. This is due to the frequency shift on the magnons (YIG sphere), which depends on the direction of the magnetic field. Interestingly, the degree of nonreciprocity of bipartite entanglements depends upon a careful optimal choice of system parameters like normalized cavity detunings, bipartite nonlinear index, self-Kerr coefficient, and effective magnomechanical coupling rate G. In addition to bipartite entanglement, we also present the idea of a bidirectional contrast ratio, which quantifies the nonreciprocity in tripartite entanglements. Our present theoretical proposal for nonreciprocity in multipartite entanglement may find applications in diverse engineering nonreciprocal devices