Entanglement of a Laguerre-Gaussian cavity mode with a rotating mirror

TL;DR

This paper demonstrates that radiation torque can entangle a Laguerre-Gaussian cavity mode with a rotating mirror, extending previous linear momentum entanglement concepts to rotational degrees of freedom.

Contribution

It introduces the concept of rotational optomechanical entanglement between a Laguerre-Gaussian mode and a rotating mirror, analyzing its dependence on temperature, detuning, and angular momentum.

Findings

Entanglement persists at various temperatures.

Entanglement depends on radiation detuning.

Higher orbital angular momentum enhances entanglement.

Abstract

It has previously been shown theoretically that the exchange of linear momentum between the light field in an optical cavity and a vibrating end mirror can entangle the electromagnetic field with the vibrational motion of that mirror. In this paper we consider the rotational analog of this situation and show that radiation torque can similarly entangle a Laguerre-Gaussian cavity mode with a rotating end mirror. We examine the mirror-field entanglement as a function of ambient temperature, radiation detuning and orbital angular momentum carried by the cavity mode.