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Title: Testing quantum correlations versus single-particle properties within Leggett's model and beyond
Authors: Branciard, C.
Brunner, N.
Gisin, N.
Kurtsiefer, C. 
Lamas-Linares, A. 
Ling, A. 
Scarani, V. 
Issue Date: Sep-2008
Citation: Branciard, 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.
Abstract: Quantum 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.
Source Title: Nature Physics
ISSN: 17452473
DOI: 10.1038/nphys1020
Appears in Collections:Staff Publications

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