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Sökning: WFRF:(Cabello Adán) > (2007-2009) > (2009)

  • Resultat 1-4 av 4
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1.
  • Amselem, Elias, et al. (författare)
  • State-Independent Quantum Contextuality with Single Photons
  • 2009
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 103:160405
  • Tidskriftsartikel (refereegranskat)abstract
    • Wepresent an experimental state-independent violation of an inequality for noncontextualtheories on single particles. We show that 20 different single-photonstates violate an inequality which involves correlations between results ofsequential compatible measurements by at least 419 standard deviations. Ourresults show that, for any physical system, even for asingle system, and independent of its state, there is auniversal set of tests whose results do not admit anoncontextual interpretation. This sheds new light on the role ofquantum mechanics in quantum information processing.
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2.
  • Bengtsson, Ingemar, et al. (författare)
  • Universality of State-Independent Violation of Correlation Inequalities for Non-Contextual Theories
  • 2009
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 103:5, s. 050401-
  • Tidskriftsartikel (refereegranskat)abstract
    • We show that the state-independent violation of inequalities for noncontextual hidden variable theories introduced in [Phys. Rev. Lett. 101, 210401 (2008)] is universal, i.e., occurs for any quantum mechanical system in which noncontextuality is meaningful. We describe a method to obtain state-independent violations for any system of dimension d >= 3. This universality proves that, according to quantum mechanics, there are no "classical'' states.
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4.
  • Cabello, Adan, et al. (författare)
  • Minimum detection efficiency required for a loophole-free violation of the Braunstein-Caves chained Bell inequalities
  • 2009
  • Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - : American Physical Society. - 1050-2947 .- 1094-1622. ; 79:6, s. 062109-1-062109-7
  • Tidskriftsartikel (refereegranskat)abstract
    • The chained Bell inequalities of Braunstein and Caves involving N settings per observer have some interesting applications. Here we obtain the minimum detection efficiency required for a loophole-free violation of the Braunstein-Caves inequalities for any N greater than= 2. We discuss both the case in which both particles are detected with the same efficiency and the case in which the particles are detected with different efficiencies.
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  • Resultat 1-4 av 4

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