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.
@article{arxiv.1305.2457,
title = {Demonstration of Motion Transduction Based on Parametrically Coupled Mechanical Resonators},
author = {Pu Huang and Pengfei Wang and Jingwei Zhou and Zixiang Wang and Chenyong Ju and Zimeng Wang and Yang Shen and Changkui Duan and Jiangfeng Du},
journal= {arXiv preprint arXiv:1305.2457},
year = {2015}
}