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Quantum correlations with no causal order.
MedLine Citation:
PMID:  23033068     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The idea that events obey a definite causal order is deeply rooted in our understanding of the world and at the basis of the very notion of time. But where does causal order come from, and is it a necessary property of nature? Here, we address these questions from the standpoint of quantum mechanics in a new framework for multipartite correlations that does not assume a pre-defined global causal structure but only the validity of quantum mechanics locally. All known situations that respect causal order, including space-like and time-like separated experiments, are captured by this framework in a unified way. Surprisingly, we find correlations that cannot be understood in terms of definite causal order. These correlations violate a 'causal inequality' that is satisfied by all space-like and time-like correlations. We further show that in a classical limit causal order always arises, which suggests that space-time may emerge from a more fundamental structure in a quantum-to-classical transition.
Authors:
Ognyan Oreshkov; Fabio Costa; Caslav Brukner
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Nature communications     Volume:  3     ISSN:  2041-1723     ISO Abbreviation:  Nat Commun     Publication Date:  2012  
Date Detail:
Created Date:  2012-10-03     Completed Date:  2013-02-01     Revised Date:  2013-04-02    
Medline Journal Info:
Nlm Unique ID:  101528555     Medline TA:  Nat Commun     Country:  England    
Other Details:
Languages:  eng     Pagination:  1092     Citation Subset:  -    
Affiliation:
Faculty of Physics, University of Vienna, Boltzmanngasse 5, Vienna A-1090, Austria. oreshkov@ulb.ac.be
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