Suppressing laser phase noise in an optomechanical system

TL;DR

This paper introduces a novel scheme to suppress laser phase noise in optomechanical systems by leveraging nonlinearities and squeezed vacuum environments, enhancing quantum memory and entanglement.

Contribution

The scheme suppresses laser phase noise without increasing single-photon coupling strength, using Kerr and Duffing nonlinearities combined with broadband-squeezed vacuum.

Findings

Laser phase noise is significantly suppressed in simulations.

Quantum memory and entanglement are enhanced by the scheme.

The method offers a new approach for studying quantum phenomena.

Abstract

We propose a scheme to suppress the laser phase noise without increasing the optomechanical single-photon coupling strength. In the scheme, the parametric amplification terms, created by Kerr and Duffing nonlinearities, can restrain laser phase noise and strengthen the effective optomechanical coupling, respectively. Interestingly, decreasing laser phase noise leads to increasing thermal noise, which is inhibited by bringing in a broadband-squeezed vacuum environment. To reflect the superiority of the scheme, we simulate quantum memory and stationary optomechanical entanglement as examples, and the corresponding numerical results demonstrate that the laser phase noise is extremely suppressed. Our method can pave the way for studying other quantum phenomena.