Strong Loophole-Free Test of Local Realism

We present a loophole-free violation of local realism using entangled photon pairs. We ensure that all relevant events in our Bell test are spacelike separated by placing the parties far enough apart and by using fast random number generators and high-speed polarization measurements. A high-quality polarization-entangled source of photons, combined with high-efficiency, low-noise, single-photon detectors, allows us to make measurements without requiring any fair-sampling assumptions. Using a hypothesis test, we compute p values as small as 5.9×10^{-9} for our Bell violation while maintaining the spacelike separation of our events. We estimate the degree to which a local realistic system could predict our…

• NS
  National Science Foundation

  Award: PHY 12-05870
• NA
  National Aeronautics and Space Administration
• CI
  California Institute of Technology
• CI
  Canadian Institute for Advanced Research
• FC
  Fundación Cellex
• NB
  New Brunswick Innovation Foundation
• EC
  European Commission

  Award: TEC2013-46168-R
• DA
  Deutscher Akademischer Austauschdienst
• IC
  Industry Canada
• MD
  Ministerio de Economía y Competitividad

  Award: FIS2011-23520
• AR
  Agricultural Research Development Agency
• NI
  National Institute of Standards and Technology
• DA
  Defense Advanced Research Projects Agency
• JP
  Jet Propulsion Laboratory
• MU
  Multidisciplinary University Research Initiative
• NS
  Natural Sciences and Engineering Research Council of Canada
• ER
  European Research Council
• ER
  European Regional Development Fund

  Award: TEC2013-46168-R
• OO
  Office of Naval Research

  Awards: N00014-13-0627, N00014
• AR
  Army Research Office