Quantum metrology: Dynamics versus entanglement

Boixo, Sergio, Datta, Animesh, Davis, Matthew J., Flammia, Steven T., Shaji, Anil and Caves, Carlton M. (2008) Quantum metrology: Dynamics versus entanglement. Physical Review Letters, 101 4: Article Number: 040403. doi:10.1103/PhysRevLett.101.040403

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Author Boixo, Sergio
Datta, Animesh
Davis, Matthew J.
Flammia, Steven T.
Shaji, Anil
Caves, Carlton M.
Title Quantum metrology: Dynamics versus entanglement
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
Publication date 2008-07-25
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.101.040403
Open Access Status File (Publisher version)
Volume 101
Issue 4
Start page Article Number: 040403
Total pages 4
Editor G. Basbas
J. Sandweiss
R. B. Schuhmann
S. G. Brown
Place of publication College Park, Maryland, USA
Publisher American Physical Society
Collection year 2009
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
020699 Quantum Physics not elsewhere classified
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.
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 77 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 74 times in Scopus Article | Citations
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Created: Tue, 24 Mar 2009, 15:46:03 EST by Jo Hughes on behalf of School of Mathematics & Physics