Light as quantum back-action nullifying meter

TL;DR

This paper introduces a novel optical oscillator-based measurement method that suppresses quantum back-action in continuous measurements, especially at low frequencies, enhancing precision in quantum optomechanics.

Contribution

It presents a new quantum back-action nullifying meter using an optical oscillator designed to counteract quantum back-action effects.

Findings

Quantum back-action is suppressed at low frequencies.

The method effectively reduces radiation pressure noise.

Application to both linear and non-linear optomechanics.

Abstract

We propose a new method to overcome quantum back-action in a measurement process using oscillators. An optical oscillator is used as a meter to measure the parameters of another open oscillator. The optical oscillator is synthesized such that the optical restoring force counters any perturbations induced by the quantum back-action phenomena. As a result, it is shown that the quantum back-action in continuous measurement is suppressed in the low frequency regime i.e., for frequencies much smaller than the resonance frequency of the open oscillator. As the meter plays the role of measuring parameters as well as suppressing the quantum back-action, we call it as quantum back-action nullifying meter. As an application of this method, synthesis of quantum back-action nullifying optical oscillator for suppressing radiation pressure force noise in linear and non-linear optomechanics is described.