Abstract
We investigate the utility of nonclassical 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 state with the same mean photon number.
- Received 16 September 2001
DOI:https://doi.org/10.1103/PhysRevA.66.023819
©2002 American Physical Society