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Sökning: WFRF:(Cabello Adán) > (2010-2014) > (2010)

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1.
  • Cabello, Adan, et al. (författare)
  • Quantum contextuality for rational vectors
  • 2010
  • Ingår i: Physics Letters A. - : Elsevier Science B.V., Amsterdam.. - 0375-9601 .- 1873-2429. ; 375:2, s. 99-99
  • Tidskriftsartikel (refereegranskat)abstract
    • The Kochen-Specker theorem states that noncontextual hidden variable models are inconsistent with the quantum predictions for every yes-no question on a qutrit, corresponding to every projector in three dimensions. It has been suggested [D.A. Meyer, Phys. Rev. Lett. 83 (1999) 3751] that the inconsistency would disappear when restricting to projectors on unit vectors with rational components; that noncontextual hidden variables could reproduce the quantum predictions for rational vectors. Here we show that a qutrit state with rational components violates an inequality valid for noncontextual hidden-variable models [A.A. Klyachko et al., Phys. Rev. Lett. 101 (2008) 020403] using rational projectors. This shows that the inconsistency remains even when using only rational vectors.
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2.
  • Guehne, Otfried, et al. (författare)
  • Compatibility and noncontextuality for sequential measurements
  • 2010
  • Ingår i: PHYSICAL REVIEW A. - 1050-2947. ; 81:2, s. 022121-
  • Tidskriftsartikel (refereegranskat)abstract
    • A basic assumption behind the inequalities used for testing noncontextual hidden variable models is that the observables measured on the same individual system are perfectly compatible. However, compatibility is not perfect in actual experiments using sequential measurements. We discuss the resulting "compatibility loophole" and present several methods to rule out certain hidden variable models that obey a kind of extended noncontextuality. Finally, we present a detailed analysis of experimental imperfections in a recent trapped-ion experiment and apply our analysis to that case.
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