Cavity optomechanical coupling assisted by an atomic gas

TL;DR

This paper presents a theoretical study of how an atomic gas inside a cavity enhances optomechanical interactions, leading to increased radiation pressure, mirror squeezing, and entanglement between the mirror and the system.

Contribution

It introduces a novel mechanism where atomic gases induce polaritons that amplify optomechanical effects and generate mirror entanglement, not observed in standard vacuum cavities.

Findings

Enhanced radiation pressure due to polariton formation.

Generation of mirror squeezing mode.

Adiabatic entanglement between mirror and system.

Abstract

We theoretically study a cavity filled with atoms, which provides the optical-mechanical interaction between the modified cavity photonic field and a movable mirror at one end. We show that the cavity field ``dresses'' these atoms, producing two types of polaritons, effectively enhancing the radiation pressure of the cavity field upon the end mirror, as well as establishing an additional squeezing mode of the end mirror. This squeezing produces an adiabatic entanglement, which is absent in usual vacuum cavities, between the oscillating mirror and the rest of the system. We analyze the entanglement and quantify it using the Loschmidt echo and fidelity.