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Träfflista för sökning "WFRF:(Cabello Adán) ;srt2:(2012);pers:(Guehne Otfried)"

Sökning: WFRF:(Cabello Adán) > (2012) > Guehne Otfried

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1.
  • Kleinmann, Matthias, et al. (författare)
  • Optimal Inequalities for State-Independent Contextuality
  • 2012
  • Ingår i: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 109:25, s. 250402-
  • Tidskriftsartikel (refereegranskat)abstract
    • Contextuality is a natural generalization of nonlocality which does not need composite systems or spacelike separation and offers a wider spectrum of interesting phenomena. Most notably, in quantum mechanics there exist scenarios where the contextual behavior is independent of the quantum state. We show that the quest for an optimal inequality separating quantum from classical noncontextual correlations in a state-independent manner admits an exact solution, as it can be formulated as a linear program. We introduce the noncontextuality polytope as a generalization of the locality polytope and apply our method to identify two different tight optimal inequalities for the most fundamental quantum scenario with state-independent contextuality.
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2.
  • Larsson, Jan-Åke, et al. (författare)
  • Maximal violation of state-independent contextuality inequalities
  • 2012
  • Ingår i: Quantum Theory: Reconsideration of Foundations - 6. - : American Institute of Physics (AIP). - 9780735411265 ; , s. 265-274
  • Konferensbidrag (refereegranskat)abstract
    • The discussion on noncontextual hidden variable models as an underlying description for the quantum-mechanical predictions started in ernest with 1967 paper by Kochen and Specker. There, it was shown that no noncontextual hidden-variable model can give these predictions. The proof used in that paper is complicated, but recently, a paper by Yu and Oh [PRL, 2012] proposes a simpler statistical proof that can also be the basis of an experimental test. Here we report on a sharper version of that statistical proof, and also explain why the algebraic upper bound to the expressions used are not reachable, even with a reasonable contextual hidden variable model. Specifically, we show that the quantum mechanical predictions reach the maximal possible value for a contextual model that keeps the expectation value of the measurement outcomes constant.
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  • Resultat 1-2 av 2
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konferensbidrag (1)
tidskriftsartikel (1)
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refereegranskat (2)
Författare/redaktör
Larsson, Jan-Åke (2)
Cabello, Adan (2)
Guehne, Otfried (2)Ta bort avgränsningen
Kleinmann, Matthias (2)
Budroni, Costantino (1)
Budroni, Constantino (1)
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Linköpings universitet (2)
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Engelska (2)
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2012 (2)Ta bort avgränsningen

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