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Closing the Detection Loophole in Bell Experiments Using Qudits

Source: Phys. Rev. Lett. 104, 060401 (2010); doi:10.1103/PhysRevLett.104.060401

Published 11 February 2010

PACS
  • 03.65.Ud
    Entanglement and quantum nonlocality
  • 42.50.Ex
    Optical implementations of quantum information processing and transfer
  • YEAR: 2010
PUBLICATION DATA
Publisher:
AIP is a member of CrossRef APS
Tamás Vértesi,1 Stefano Pironio,2 and Nicolas Brunner3
1Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, P.O. Box 51, Hungary
2Group of Applied Physics, University of Geneva, CH-1211 Geneva 4, Switzerland
3H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, United Kingdom
We show that the detection efficiencies required for closing the detection loophole in Bell tests can be significantly lowered using quantum systems of dimension larger than two. We introduce a series of asymmetric Bell tests for which an efficiency arbitrarily close to 1/N can be tolerated using N-dimensional systems, and a symmetric Bell test for which the efficiency can be lowered down to 61.8% using four-dimensional systems. Experimental perspectives for our schemes look promising considering recent progress in atom-photon entanglement and in photon hyperentanglement. ©2010 The American Physical Society
History: Received 8 October 2009; published 11 February 2010
Permalink: http://link.aps.org/abstract/PRL/v104/e060401
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