We describe an experiment in which the quadratures of the position of an harmonically-bound mirror are observed at the attometer level. We have studied the Brownian motion of the mirror, both in the free regime and in the cold-damped regime when an external viscous force is applied by radiation pressure. We have also studied the thermal-noise squeezing when the external force is parametrically modulated. We have observed both the 50% theoretical limit of squeezing at low gain and the parametric oscillation of the mirror for a large gain.
@article{arxiv.quant-ph/0207049,
title = {Optical phase-space reconstruction of mirror position at the attometer level},
author = {T. Briant and P. F. Cohadon and M. Pinard and A. Heidmann},
journal= {arXiv preprint arXiv:quant-ph/0207049},
year = {2009}
}