Quantum Metrology: Detection of weak forces using Schrodinger Cat resources
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We investigate the utility of non classical states of simple harmonic oscillators (a superposition of coherent states) for sensitive force detection. We find that like squeezed states a superposition of coherent states allows the detection of 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.
Proceedings of the Sixth International Conference on Quantum Communication, Measurement and Computing, pg 333, ed by J H Shapiro and O Hirota, Rinton Press (2003)
Proceedings of the Sixth International Conference on Quantum Communication, Measurement and Computing, pg 333, ed by J H Shapiro and O Hirota, Rinton Press (2003)