title: Experiments towards falsification of noncontextual hidden variable theories
abstract: We present two experiments testing the hypothesis of noncontextual hidden variables. The first one is based on observation of two-photon pseudo-Greenberger-Horne-Zeilinger correlations, with two of the originally three particles mimicked by the polarization degree of freedom and the spatial degree of freedom of a single photon. The second one, a single-photon experiment, utilizes the same trick to emulate two particle correlations, and is an "event ready" test of a Bell-like inequality, derived from the noncontextuality assumption. Modulo fair sampling, the data falsify noncontextual hidden variables.
authors.affiliation: Institut fur Experimentalphysik, Universitat Innsbruck, A-6020 Innsbruck, Austria.
authors.initials: M
authors.lastname: Michler
authors.initials: H
authors.lastname: Weinfurter
authors.initials: M
authors.lastname: Zukowski