Demonstration of Motion Transduction Based on Parametrically Coupled Mechanical Resonators

TL;DR

This paper introduces a universal mechanical motion transduction scheme using parametrically coupled resonators, enabling high-precision, low-back-action measurements at room temperature, with broad potential applications in force sensing.

Contribution

The authors demonstrate a novel mechanical frequency conversion scheme that transfers motion to a measurable resonator, surpassing intrinsic noise limits at room temperature.

Findings

Motion imprecision and back-action are below intrinsic levels.

The scheme aligns well with theoretical predictions.

Potential for extensive applications in force measurements.

Abstract

Universal sensing the motion of mechanical resonators with high precision and low back-action is of paramount importance in ultra-weak signal detection which plays a fundamental role in modern physics. Here we present a universal scheme that transfer mechanically the motion of the resonator not directly measurable to the one can be precisely measured using mechanical frequency conversion. Demonstration of the scheme at room temperature shows that both the motion imprecision and the back-action force are below the intrinsic level of the objective resonator, which agree well with our theoretical prediction. The scheme developed here provides an effective interface between an arbitrary mechanical resonator and a high quantum efficient displacement sensor, and is expected to find extensive applications in high-demanding mechanical-based force measurements.