Noise suppression of on-chip mechanical resonators by chaotic coherent feedback

TL;DR

This paper introduces a chaotic coherent feedback method to effectively decouple nanomechanical resonators from environmental noise, enhancing their use in quantum memory applications by broadband modulation of mechanical modes.

Contribution

The study demonstrates a novel chaotic feedback control technique that broadband modulates mechanical resonators, significantly reducing environmental noise impact in optomechanical systems.

Findings

Chaotic feedback induces broadband response in mechanical modes.

Noise decoupling improves quantum memory efficiency.

Method effectively suppresses environmental noise in nanomechanical systems.

Abstract

We propose a method to decouple the nanomechanical resonator in optomechanical systems from the environmental noise by introducing a chaotic coherent feedback loop. We find that the chaotic controller in the feedback loop can modulate the dynamics of the controlled optomechanical system and induce a broadband response of the mechanical mode. This broadband response of the mechanical mode will cut off the coupling between the mechanical mode and the environment and thus suppress the environmental noise of the mechanical modes. As an application, we use the protected optomechanical system to act as a quantum memory. It's shown that the noise-decoupled optomechanical quantum memory is efficient for storing information transferred from coherent or squeezed light.