Noiseless signal amplification in an opto-mechanical transducer

TL;DR

This paper demonstrates a method for noiseless amplification of classical signals in an opto-mechanical transducer, surpassing the Standard Quantum Limit through quantum back-action evasion and sideband measurement techniques.

Contribution

It introduces a novel approach combining quantum back-action evasion with sideband measurement for noiseless signal amplification in quantum transducers.

Findings

Achieves quantum back-action evasion exceeding the Standard Quantum Limit

Enables noiseless amplification by measuring modulation sidebands

Enhances sensitivity of quantum force detection

Abstract

The high-sensitivity quantum detection of a resonant classical force acting on a quantum oscillator can be substantially enhanced through the use of a resonant optical parametric transducer. We demonstrate that this approach not only enables quantum back-action evasion measurements that exceed the Standard Quantum Limit of sensitivity but also facilitates the noiseless amplification of the classical signal. This amplification is achieved by independently measuring the two modulation sidebands generated by the signal force, allowing for a more precise and noise-resistant detection process.