Quantum metrology: dynamics versus entanglement.

Boixo, Sergio; Datta, Animesh; Davis, Matthew J; Flammia, Steven T; Shaji, Anil; Caves, Carlton M

Boixo, Sergio; Datta, Animesh; Davis, Matthew J; Flammia, Steven T; Shaji, Anil; Caves, Carlton M.

Afiliación

Boixo S; Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131-0001, USA.

Phys Rev Lett ; 101(4): 040403, 2008 Jul 25.

Article en En | MEDLINE | ID: mdl-18764311

RESUMEN

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.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2008 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos

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