Nonreciprocal Microwave-Optical Entanglement in Kerr-Modified Cavity Optomagnomechanics

TL;DR

This paper demonstrates how the magnon Kerr effect can be used to generate and control nonreciprocal microwave-optical entanglement in cavity optomagnomechanics, enabling robust and tunable quantum communication applications.

Contribution

It introduces a novel method to achieve nonreciprocal entanglement using the magnon Kerr effect in cavity optomagnomechanics, with tunable and robust features.

Findings

Nonreciprocal enhancement of entanglement achieved.

Entanglement robustness against thermal noise improved.

Selective control of entanglement nonreciprocity demonstrated.

Abstract

Microwave-optical entanglement is essential for efficient quantum communication, secure information transfer, and integrating microwave and optical quantum systems to advance hybrid quantum technologies. In this work, we demonstrate how the magnon Kerr effect can be harnessed to generate and control nonreciprocal entanglement in cavity optomagnomechanics (COMM). This effect induces magnon frequency shifts and introduces pair-magnon interactions, both of which are tunable through the magnetic field direction, enabling nonreciprocal behavior. By adjusting system parameters such as magnon frequency detuning, we show that magnon-phonon, microwave-optical photon-photon, and optical photon-magnon entanglement can be nonreciprocally enhanced and rendered more robust against thermal noise. Additionally, the nonreciprocity of entanglement can be selectively controlled, and ideal nonreciprocal entanglement is achievable. This work paves the way for designing nonreciprocal quantum devices across the microwave and optical regimes, leveraging the unique properties of the magnon Kerr effect in COMM.