Phys. Rev. Lett. 101, 040403 (2008) [4 pages]

Quantum Metrology: Dynamics versus Entanglement

Abstract

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Sergio Boixo^1,2, Animesh Datta¹, Matthew J. Davis³, Steven T. Flammia⁴, Anil Shaji^1,*, and Carlton M. Caves^1,3
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

Received 14 May 2008; published 24 July 2008

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/n^3/2, even when the constituents are initially unentangled. We devise a protocol that achieves the 1/n^3/2 scaling without generating any entanglement among the constituents, and we suggest that the protocol might be implemented in a two-component Bose-Einstein condensate.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.101.040403

DOI:

10.1103/PhysRevLett.101.040403

PACS:

03.65.Ta, 03.75.Mn, 03.75.Nt

^*shaji@unm.edu

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Phys. Rev. Lett. 101, 040403 (2008) [4 pages]

Quantum Metrology: Dynamics versus Entanglement