Please use this identifier to cite or link to this item: https://doi.org/10.1038/nphys1020
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dc.titleTesting quantum correlations versus single-particle properties within Leggett's model and beyond
dc.contributor.authorBranciard, C.
dc.contributor.authorBrunner, N.
dc.contributor.authorGisin, N.
dc.contributor.authorKurtsiefer, C.
dc.contributor.authorLamas-Linares, A.
dc.contributor.authorLing, A.
dc.contributor.authorScarani, V.
dc.date.accessioned2014-12-12T07:34:48Z
dc.date.available2014-12-12T07:34:48Z
dc.date.issued2008-09
dc.identifier.citationBranciard, C., Brunner, N., Gisin, N., Kurtsiefer, C., Lamas-Linares, A., Ling, A., Scarani, V. (2008-09). Testing quantum correlations versus single-particle properties within Leggett's model and beyond. Nature Physics 4 (9) : 681-685. ScholarBank@NUS Repository. https://doi.org/10.1038/nphys1020
dc.identifier.issn17452473
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/115974
dc.description.abstractQuantum theory predicts and experiments confirm that nature can produce correlations between distant events that are non-local in the sense of violating a Bell inequality. Nevertheless, Bell's strong sentence 'Correlations cry out for explanations' (ref. 2) remains relevant. The maturing of quantum information science and the discovery of the power of non-local correlations, for example for cryptographic key distribution beyond the standard quantum key distribution schemes, strengthen Bell's wish and make it even more timely. In 2003, Leggett proposed an alternative model for non-local correlations that he proved to be incompatible with quantum predictions. We present here a new approach to this model, along with new inequalities for testing it. These inequalities can be derived in a very simple way, assuming only the non-negativity of probability distributions; they are also stronger than previously published and experimentally tested Leggett-type inequalities. The simplest of the new inequalities is experimentally violated. Then we go beyond Leggett's model, and show that we cannot ascribe even partially defined individual properties to the components of a maximally entangled pair. © 2008 Macmillan Publishers Limited. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1038/nphys1020
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.contributor.departmentCENTRE FOR QUANTUM TECHNOLOGIES
dc.description.doi10.1038/nphys1020
dc.description.sourcetitleNature Physics
dc.description.volume4
dc.description.issue9
dc.description.page681-685
dc.identifier.isiut000259686400009
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