Asymmetry-Based Quantum Backaction Suppression in Quadratic Optomechanics

TL;DR

This paper proposes a modification to quadratic dispersive coupling in optomechanics that significantly reduces quantum backaction noise, enhancing applications like optical levitation and nondestructive phonon measurement.

Contribution

It introduces a simple modification to suppress quantum backaction noise in QDC systems without weakening the coupling strength.

Findings

Significant reduction in quantum radiation force noise.

Identification of optimal operational regimes.

Enhanced performance in optical levitation and phonon measurement.

Abstract

As the field of optomechanics advances, quadratic dispersive coupling (QDC) promise an increasingly feasible class of qualitatively new functionality. However, the leading QDC geometries also generate linear dissipative coupling, and an associated quantum radiation force noise that is detrimental to QDC applications. Here, we propose a simple modification that dramatically reduces this noise without altering the QDC strength. We identify optimal regimes of operation, and discuss advantages within the examples of optical levitation and nondestructive phonon measurement.