Bell-inequality violation with entangled photons, free of the coincidence-time loophole

Larsson, Jan-ÅkeLinköpings universitet,Informationskodning,Tekniska högskolan (author)

Funding Agencies|Austrian Science Fund (FWF) under project CoQuS; European Commission through a Marie-Curie Fellowship [PIOF-GA-2012-329851]
In a local realist model, physical properties are defined prior to and independent of measurement and no physical influence can propagate faster than the speed of light. Proper experimental violation of a Bell inequality would show that the world cannot be described with such a model. Experiments intended to demonstrate a violation usually require additional assumptions that make them vulnerable to a number of "loopholes." In both pulsed and continuously pumped photonic experiments, an experimenter needs to identify which detected photons belong to the same pair, giving rise to the coincidence-time loophole. Here, via two different methods, we derive Clauser-Horne- and Eberhard-type inequalities that are not only free of the fair-sampling assumption (thus not being vulnerable to the detection loophole), but also free of the fair-coincidence assumption (thus not being vulnerable to the coincidence-time loophole). Both approaches can be used for pulsed as well as for continuously pumped experiments. Moreover, as they can also be applied to already existing experimental data, we finally show that a recent experiment [Giustina et al., Nature (London) 497, 227 (2013)] violated local realism without requiring the fair-coincidence assumption.

Giustina, MarissaAustrian Academic Science, Austria (author)
Kofler, JohannesMax Planck Institute Quantum Opt MPQ, Germany (author)
Wittmann, BernhardAustrian Academic Science, Austria (author)
Ursin, RupertAustrian Academic Science, Austria (author)
Ramelow, SvenAustrian Academic Science, Austria; University of Vienna, Austria; Cornell University, NY USA (author)
Linköpings universitetInformationskodning (creator_code:org_t)

In:Physical Review A. Atomic, Molecular, and Optical Physics: American Physical Society90:3, s. 032107-1050-29471094-1622

By the author/editor: Larsson, Jan-Åke; Giustina, Mariss ...; Kofler, Johannes; Wittmann, Bernha ...; Ursin, Rupert; Ramelow, Sven

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