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Device-independent witnesses of genuine multipartite entanglement.
MedLine Citation:
PMID:  21770616     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
We consider the problem of determining whether genuine multipartite entanglement was produced in an experiment, without relying on a characterization of the systems observed or of the measurements performed. We present an n-partite inequality that is satisfied by all correlations produced by measurements on biseparable quantum states, but which can be violated by n-partite entangled states, such as Greenberger-Horne-Zeilinger states. In contrast to traditional entanglement witnesses, the violation of this inequality implies that the state is not biseparable independently of the Hilbert space dimension and of the measured operators. Violation of this inequality does not imply, however, genuine multipartite nonlocality. We show more generically how the problem of identifying genuine tripartite entanglement in a device-independent way can be addressed through semidefinite programming.
Authors:
Jean-Daniel Bancal; Nicolas Gisin; Yeong-Cherng Liang; Stefano Pironio
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Publication Detail:
Type:  Journal Article     Date:  2011-06-24
Journal Detail:
Title:  Physical review letters     Volume:  106     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-07-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  250404     Citation Subset:  IM    
Affiliation:
Group of Applied Physics, University of Geneva, Geneva, Switzerland.
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