Enhanced optomechanical entanglement and cooling via dissipation engineering

TL;DR

This paper introduces a dissipation engineering scheme in optomechanics using an ancillary mechanical mode to enhance entanglement and cooling, demonstrating significant improvements in system performance.

Contribution

The authors propose a novel dissipation engineering method with an ancillary mode to control optical mode linewidth, improving entanglement and phonon cooling in optomechanical systems.

Findings

Restoration of optomechanical entanglement despite thermal phonons

Achieved an order of magnitude improvement in phonon cooling

Scheme is adaptable to various bosonic mode systems

Abstract

We propose an optomechanical dissipation engineering scheme by introducing an ancillary mechanical mode with a large decay rate to control the density of states of the optical mode. The effective linewidth of the optical mode can be reduced or broadened, manifesting the dissipation engineering. To prove the ability of our scheme in improving the performances of the optomechanical system, we studied optomechanical entanglement and phonon cooling. It is demonstrated that the optomechanical entanglement overwhelmed by thermal phonon excitations could be restored via dissipation engineering. For the phonon cooling, an order of magnitude improvement could be achieved. Our scheme can be generalized to other systems with multiple bosonic modes, which is experimentally feasible with advances in materials and nanofabrication, including optical Fabry-Perot cavities, superconducting circuits, and nanobeam photonic crystals.