Weak-force detection with superposed coherent states
William J. Munro, Kae Nemoto, Gerard J Milburn, Samuel L. Braunstein · Physical Review A · 2002
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.