Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres

@article{Hensen2015LoopholefreeBI,
  title={Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres},
  author={Bas Hensen and Hannes Bernien and Ana{\"i}s Dr{\'e}au and Andreas Reiserer and Norbert Kalb and Machiel S. Blok and J. Ruitenberg and R. F. L. Vermeulen and R. N. Schouten and Carlos Abell{\'a}n and Waldimar Amaya and Valerio Pruneri and Morgan W. Mitchell and Matthew L. Markham and Daniel J. Twitchen and David Elkouss and Stephanie Wehner and T H Taminiau and Ronald Hanson},
  journal={Nature},
  year={2015},
  volume={526},
  pages={682-686}
}
More than 50 years ago, John Bell proved that no theory of nature that obeys locality and realism can reproduce all the predictions of quantum theory: in any local-realist theory, the correlations between outcomes of measurements on distant particles satisfy an inequality that can be violated if the particles are entangled. Numerous Bell inequality tests have been reported; however, all experiments reported so far required additional assumptions to obtain a contradiction with local realism… 
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Comment on "Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometers"
In a recent article Hensen et al. [Nature 526, 682 (2015)] report on a sophisticated Bell experiment, simultaneously closing, for the first time, loopholes for local hidden-variable theories (HVTs).
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