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      Various quantum nonlocality tests with a simple 2-photon entanglement source

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          Abstract

          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 article 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).

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          Wringing out better Bell inequalities

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            Author and article information

            Journal
            12 January 2011
            Article
            10.1103/PhysRevA.83.052104
            1101.2313
            3ac0371b-105c-4e3e-b70d-0ded9ad6b7f3

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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            Custom metadata
            Physical Review A 83, 052104 (2011)
            8 pages, 5 figures
            quant-ph

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