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Detection-Loophole-Free Test of Quantum Nonlocality, and Applications

B. G. Christensen, K. T. McCusker, J. B. Altepeter, B. Calkins, T. Gerrits, A. E. Lita, A. Miller, L. K. Shalm, Y. Zhang, S. W. Nam, N. Brunner, C. C. W. Lim, N. Gisin, and P. G. Kwiat
Phys. Rev. Lett. 111, 130406 – Published 26 September 2013
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Abstract

We present a source of entangled photons that violates a Bell inequality free of the “fair-sampling” assumption, by over 7 standard deviations. This violation is the first reported experiment with photons to close the detection loophole, and we demonstrate enough “efficiency” overhead to eventually perform a fully loophole-free test of local realism. The entanglement quality is verified by maximally violating additional Bell tests, testing the upper limit of quantum correlations. Finally, we use the source to generate “device-independent” private quantum random numbers at rates over 4 orders of magnitude beyond previous experiments.

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  • Received 21 June 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.130406

© 2013 American Physical Society

Synopsis

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Closing Quantum Loopholes

Published 26 September 2013

New experiments strengthen confidence in the quantum weirdness of photons

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Authors & Affiliations

B. G. Christensen1,*, K. T. McCusker1, J. B. Altepeter1, B. Calkins2, T. Gerrits2, A. E. Lita2, A. Miller2,3, L. K. Shalm2, Y. Zhang2,4, S. W. Nam2, N. Brunner5,6, C. C. W. Lim7, N. Gisin7, and P. G. Kwiat1

  • 1Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 2National Institute of Standards and Technology, Boulder, Colorado 80305, USA
  • 3Department of Physics, Albion College, Albion, Michigan 49224, USA
  • 4Department of Physics, University of Colorado at Boulder, Boulder, Colorado 80309, USA
  • 5Département de Physique Théorique, Université de Genéve, 1211 Genéve, Switzerland
  • 6H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
  • 7Group of Applied Physics, Université de Genéve, 1211 Genéve, Switzerland

  • *Corresponding author. bgchris2@illinois.edu

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Issue

Vol. 111, Iss. 13 — 27 September 2013

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