Quantum Metrology: Dynamics versus Entanglement

Sergio Boixo, Animesh Datta, Matthew J. Davis, Steven T. Flammia, Anil Shaji, and Carlton M. Caves
Phys. Rev. Lett. 101, 040403 – Published 24 July 2008

Abstract

A parameter whose coupling to a quantum probe of n constituents includes all two-body interactions between the constituents can be measured with an uncertainty that scales as 1/n3/2, even when the constituents are initially unentangled. We devise a protocol that achieves the 1/n3/2 scaling without generating any entanglement among the constituents, and we suggest that the protocol might be implemented in a two-component Bose-Einstein condensate.

  • Figure
  • Received 14 May 2008

DOI:http://dx.doi.org/10.1103/PhysRevLett.101.040403

©2008 American Physical Society

Authors & Affiliations

Sergio Boixo1,2, Animesh Datta1, Matthew J. Davis3, Steven T. Flammia4, Anil Shaji1,*, and Carlton M. Caves1,3

  • 1Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131-0001, USA
  • 2Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 3School of Physical Sciences, University of Queensland, Brisbane, Queensland 4072, Australia
  • 4Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario N2L 2Y5, Canada

  • *shaji@unm.edu

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Vol. 101, Iss. 4 — 25 July 2008

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