Various quantum nonlocality tests with a commercial two-photon entanglement source

Article Article scientifique Article Various quantum nonlocality tests with a commercial two-photon entanglement source eng 2011 author Pomarico Enrico 668255 author Bancal Jean-Daniel 556632 author Sanguinetti Bruno 701423 author Rochdi Anas 689915 author Gisin Nicolas 23716 052104-1/7 10.1103/PhysRevA.83.052104 1050-2947 Nonlocality is a fascinating and counterintuitive aspect of nature, revealed by the violation of a Bell inequality. The standard and easiest configuration in which Bell inequalities can be measured has been proposed by Clauser-Horne-Shimony-Holt (CHSH). However, alternative nonlocality tests can also be carried out. In particular, Bell inequalities requiring multiple measurement settings can provide deeper fundamental insights about quantum nonlocality, as well as offering advantages in the presence of noise and detection inefficiency. In this paper we show how these nonlocality tests can be performed using a commercially available source of entangled photon pairs. We report the violation of a series of these nonlocality tests (I3322, I4422, and chained inequalities). With the violation of the chained inequality with 4 settings per side we put an upper limit at 0.49 on the local content of the states prepared by the source (instead of 0.63 attainable with CHSH). We also quantify the amount of true randomness that has been created during our experiment (assuming fair sampling of the detected events). Dewey 500.2 35 Groupe de physique appliquée 135 false Physical review, A, Atomic, molecular, and optical physics 83 5 a7588930-4ae1-4931-b93e-e88ea0c010ae Article (Accepted version) Public fulltext.pdf 319588 application/pdf openAccess Faculté des sciences / Section de physique / Groupe de physique appliquée

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Various quantum nonlocality tests with a commercial two-photon entanglement source	Physical review, A, Atomic, molecular, and optical physics			2011	730	685

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