We study the possibility of revealing a weak coherent force by using a pendular mirror as a probe, and coupling this to a radiation field, which acts as the meter, in a cavityless configuration. We determine the sensitivity of such a scheme and show that the use of an entangled meter state greatly improves the ultimate detection limit. We also compare this scheme with that involving an optical cavity.
@article{arxiv.quant-ph/0312166,
title = {Sensitivity of a cavityless optomechanical system},
author = {Rachele Fermani and Stefano Mancini and Paolo Tombesi},
journal= {arXiv preprint arXiv:quant-ph/0312166},
year = {2007}
}