Macroscopic entanglement of three magnon modes in three cavities via optical parametric amplifier

TL;DR

This paper proposes a scheme using optical parametric amplification to generate and enhance bipartite and tripartite entanglement among three magnon modes in a three-cavity system, demonstrating feasibility and robustness.

Contribution

It introduces a novel method employing nonlinear optical parametric amplifiers to generate steady-state entanglement among magnon modes in a multi-cavity setup.

Findings

OPA can generate steady-state bipartite and tripartite magnon entanglement.

Entanglement strength increases with nonlinear interaction strength.

Multiplexed OPA inputs significantly improve entanglement generation.

Abstract

We propose a scheme to generate bipartite and tripartite entanglements of three magnon modes in a three-cavity system using a nonlinear optical parametric amplifier (OPA). The three magnon modes in three YIG spheres are respectively placed inside three cavities near the maximum magnetic fields of the cavities and coupled to cavity modes via linear magnetic dipole interaction. Additionally, linear coupling interaction exists between two cavities. Using experimentally feasible parameters, we demonstrate that OPA can prepare the three magnon modes in a steady-state entangled state, bipartite and tripartite entanglements increase with the nonlinear interaction strength of OPA. An alternative approach to enhance quantum entanglement involves multiplexed OPA inputs. By employing individual OPA for each cavity, we observe a significant improvement in entanglement generation. All the entanglements are robust against bath temperature.