Optically-mediated remote entanglement generation in magnon-cavity systems

TL;DR

This paper explores the generation of remote entanglement between microwave magnon modes in a cavity system connected by optical fiber, using frequency conversion and optimal control to produce robust entangled states.

Contribution

It introduces a method for optically-mediated remote entanglement in magnon-cavity systems with a novel frequency conversion approach and active control for on-demand entanglement.

Findings

Analytical study of entanglement dynamics

Active optimal control for Bell state generation

Robustness of entanglement against environmental noise

Abstract

We study the remote entanglement generation between macroscopic microwave magnon modes in a coupled cavity system. The cavities are connected via an optical fiber, which necessitates the use of a frequency conversion inside the cavity. The converter may be implemented via a rare-earth doped crystal acting like an effective three-level system. The entanglement dynamics of the system is analytically studied, and an active optimal control method is also proposed where one may generate maximally entangled Bell states on demand with a given evolution time. The system dynamics and its control have also been studied in a generic non-Markovian open system framework, and the generated entanglement is found to be robust against environmental noises.