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Sökning: WFRF:(Kwiat Paul)

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  • Aerts, Sven, et al. (författare)
  • Two-photon Franson-type experiments and local realism
  • 1999
  • Ingår i: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 83:15, s. 2872-2876
  • Tidskriftsartikel (refereegranskat)abstract
    • The two-photon interferometric experiment proposed by J. D. Franson [Phys. Rev. Lett. 62, 2205 (1989)] is often treated as a “Bell test of local realism.” However, it has been suggested that this is incorrect due to the 50% postselection performed even in the ideal gedanken version of the experiment. Here we present a simple local hidden variable model of the experiment that successfully explains the results obtained in usual realizations of the experiment, even with perfect detectors. Furthermore, we also show that there is no such model if the switching of the local phase settings is done at a rate determined by the internal geometry of the interferometers.
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3.
  • Ericsson, Marie, et al. (författare)
  • Measurement of geometric phase for mixed states using single photon interferometry
  • 2005
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 94:5, s. 050401-
  • Tidskriftsartikel (refereegranskat)abstract
    • Geometric phase may enable inherently fault-tolerant quantum computation. However, due to potential decoherence effects, it is important to understand how such phases arise for {\it mixed} input states. We report the first experiment to measure mixed-state geometric phases in optics, using a Mach-Zehnder interferometer, and polarization mixed states that are produced in two different ways: decohering pure states with birefringent elements; and producing a nonmaximally entangled state of two photons and tracing over one of them, a form of remote state preparation.
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