We investigate the utility of non classical states of simple harmonic oscillators, particularly a superposition of coherent states, for sensitive force detection. We find that like squeezed states a superposition of coherent states allows displacement measurements at the Heisenberg limit. Entangling many superpositions of coherent states offers a significant advantage over a single mode superposition states with the same mean photon number.
@article{arxiv.quant-ph/0109049,
title = {Weak force detection with superposed coherent states},
author = {W. J. Munro and K. Nemoto and G. J. Milburn and S. L. Braunstein},
journal= {arXiv preprint arXiv:quant-ph/0109049},
year = {2009}
}
Comments
6 pages, no figures: New section added on entangled resources. Changes to discussions and conclusion