Measuring Multipartite Concurrence with a Single Factorizable Observable

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Leandro Aolita
Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21941-972 Rio de Janeiro, RJ, Brazil

Florian Mintert
Department of Physics, Harvard University, 17 Oxford Street, Cambridge Massachusetts, USA

Received 27 March 2006; published 1 August 2006

Weshow that, for any composite system with an arbitrary numberof finite-dimensional subsystems, it is possible to directly measure themultipartite concurrence of pure states by detecting only one singlefactorizable observable, provided that two copies of the composite stateare available. This result can be immediately put into practicein trapped-ion and entangled-photon experiments.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.050501
DOI:	10.1103/PhysRevLett.97.050501
PACS:	03.67.Mn; 42.50.-p 03.67.Mn Quantum entanglement production, characterization, and manipulation 42.50.-p Quantum optics YEAR: 2006

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