Bell violation using entangled photons without the fair-sampling assumption

Bell violation using entangled photons without the fair-sampling assumption The violation of a Bell inequality is an experimental observation that forces the abandonment of a local realistic viewpoint—namely, one in which physical properties are (probabilistically) defined before and independently of measurement, and in which 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 entangled photons to violate a Bell inequality while closing the fair-sampling loophole, that is, without assuming that the sample of measured photons accurately represents the entire ensemble . To do this, we use the Eberhard form of Bell’s inequality, which is not vulnerable to the fair-sampling assumption and which allows a lower collection efficiency than other forms . Technical improvements of the photon source and high-efficiency transition-edge sensors were crucial for achieving a sufficiently high collection efficiency. Our experiment makes the photon the first physical system for which each of the main loopholes has been closed, albeit in different experiments. In 1935, Einstein, Podolsky and Rosen argued that quantum mechanics is incomplete when assuming that no physical influence can be faster than the speed of light and that the properties http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Nature Publishing Group (NPG)

Bell violation using entangled photons without the fair-sampling assumption

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Publisher
Nature Publishing Group (NPG)
Copyright
Copyright © 2013 Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.
ISSN
0028-0836
eISSN
1476-4687
D.O.I.
10.1038/nature12012
Publisher site
See Article on Publisher Site

Abstract

The violation of a Bell inequality is an experimental observation that forces the abandonment of a local realistic viewpoint—namely, one in which physical properties are (probabilistically) defined before and independently of measurement, and in which 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 entangled photons to violate a Bell inequality while closing the fair-sampling loophole, that is, without assuming that the sample of measured photons accurately represents the entire ensemble . To do this, we use the Eberhard form of Bell’s inequality, which is not vulnerable to the fair-sampling assumption and which allows a lower collection efficiency than other forms . Technical improvements of the photon source and high-efficiency transition-edge sensors were crucial for achieving a sufficiently high collection efficiency. Our experiment makes the photon the first physical system for which each of the main loopholes has been closed, albeit in different experiments. In 1935, Einstein, Podolsky and Rosen argued that quantum mechanics is incomplete when assuming that no physical influence can be faster than the speed of light and that the properties

Journal

NatureNature Publishing Group (NPG)

Published: Apr 14, 2013

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