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A team including Anton Zeilinger has performed an experiment closing the so-called "fair sampling loophole" for photons.
http://arxiv.org/abs/1212.0533
Bell violation with entangled photons, free of the fair-sampling assumption
Marissa Giustina, Alexandra Mech, Sven Ramelow, Bernhard Wittmann, Johannes Kofler, Adriana Lita, Brice Calkins, Thomas Gerrits, Sae Woo Nam, Rupert Ursin, Anton Zeilinger
(Submitted on 3 Dec 2012)
"The violation of a Bell inequality is an experimental observation that forces one to abandon a local realistic worldview, namely, one in which physical properties are (probabilistically) defined prior to and independent of measurement and no physical influence can propagate faster than the speed of light. All such experimental violations require additional assumptions depending on their specific construction making them vulnerable to so-called "loopholes." Here, we use photons and high-efficiency superconducting detectors to violate a Bell inequality closing the fair-sampling loophole, i.e. without assuming that the sample of measured photons accurately represents the entire ensemble. Additionally, we demonstrate that our setup can realize one-sided device-independent quantum key distribution on both sides. This represents a significant advance relevant to both fundamental tests and promising quantum applications."
Previously, a Bell Inequality had been violated free of the fair sampling assumption using Be+ ions (2001). That team included 2012 Nobel prize winner David Wineland of NIST. This new experiment has the advantage of having been performed with photons. I anticipate that a future variation might be performed to close both the fair sampling AND the locality assumptions simultaneously.
http://arxiv.org/abs/1212.0533
Bell violation with entangled photons, free of the fair-sampling assumption
Marissa Giustina, Alexandra Mech, Sven Ramelow, Bernhard Wittmann, Johannes Kofler, Adriana Lita, Brice Calkins, Thomas Gerrits, Sae Woo Nam, Rupert Ursin, Anton Zeilinger
(Submitted on 3 Dec 2012)
"The violation of a Bell inequality is an experimental observation that forces one to abandon a local realistic worldview, namely, one in which physical properties are (probabilistically) defined prior to and independent of measurement and no physical influence can propagate faster than the speed of light. All such experimental violations require additional assumptions depending on their specific construction making them vulnerable to so-called "loopholes." Here, we use photons and high-efficiency superconducting detectors to violate a Bell inequality closing the fair-sampling loophole, i.e. without assuming that the sample of measured photons accurately represents the entire ensemble. Additionally, we demonstrate that our setup can realize one-sided device-independent quantum key distribution on both sides. This represents a significant advance relevant to both fundamental tests and promising quantum applications."
Previously, a Bell Inequality had been violated free of the fair sampling assumption using Be+ ions (2001). That team included 2012 Nobel prize winner David Wineland of NIST. This new experiment has the advantage of having been performed with photons. I anticipate that a future variation might be performed to close both the fair sampling AND the locality assumptions simultaneously.