Experimental falsification of Leggett's nonlocal variable model.

@article{Branciard2007ExperimentalFO,
  title={Experimental falsification of Leggett's nonlocal variable model.},
  author={Cyril Branciard and Alexander Ling and Nicolas Gisin and Christian Kurtsiefer and Antia Lamas-Linares and Valerio Scarani},
  journal={Physical review letters},
  year={2007},
  volume={99 21},
  pages={210407}
}
Bell's theorem guarantees that no model based on local variables can reproduce quantum correlations. Also, some models based on nonlocal variables, if subject to apparently "reasonable" constraints, may fail to reproduce quantum physics. In this Letter, we introduce a family of inequalities, which use a finite number of measurement settings, and which therefore allow testing Leggett's nonlocal model versus quantum physics. Our experimental data falsify Leggett's model and are in agreement with… CONTINUE READING
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