Breaking mechanical dark mode via the Coulomb interaction

TL;DR

This paper introduces a method to break the dark mode in degenerate mechanical resonators using Coulomb interaction, enabling ground-state cooling, mechanical squeezing, and entanglement in optomechanical systems.

Contribution

It demonstrates breaking dark mode degeneracy with Coulomb interaction to achieve ground-state cooling, squeezing, and entanglement in optomechanical systems.

Findings

Ground-state cooling beyond the resolved sideband regime.

Generation of strong mechanical squeezing beyond 3 dB.

Production of bipartite and tripartite entanglement.

Abstract

We propose a method to break the dark mode of two degenerate mechanical resonators (MRs) in optomechanical systems via the Coulomb interaction. Two degenerate MRs can be cooled to their ground-state simultaneously beyond the resolved sideband regime using the Coulomb interaction and an optical parametric amplifier (OPA). We show that strong and robust mechanical squeezing beyond 3 dB can be generated using the OPA and mechanical parametric amplification (MPA) introduced by the Coulomb interaction. Our results manifests that robust bipartite and genuine tripartite entanglement can be produced in a degenerate optomechanical system.