Weak-force detection with superposed coherent states

W. J. Munro, K. Nemoto, G. J. Milburn, and S. L. Braunstein
Phys. Rev. A 66, 023819 – Published 27 August 2002
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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

Authors & Affiliations

W. J. Munro1,*, K. Nemoto2,†, G. J. Milburn3,4, and S. L. Braunstein2

  • 1Hewlett Packard Laboratories, Bristol BS34 8HZ, United Kingdom
  • 2School of Informatics, University of Wales, Dean Street, Bangor LL57 1UT, United Kingdom
  • 3Institute for Quantum Information, California Institute of Technology, MC 107-81, Pasadena, California 91125-8100
  • 4Centre for Quantum Computer Technology, University of Queensland, Queensland 4072, Australia

  • *Email address: bill_munro@hp.com
  • Email address: nemoto@informatics.bangor.ac.uk

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Vol. 66, Iss. 2 — August 2002

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