Experimental Falsification of Leggett's Nonlocal Variable Model
Abstract
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 quantum predictions.
 Publication:

Physical Review Letters
 Pub Date:
 November 2007
 DOI:
 10.1103/PhysRevLett.99.210407
 arXiv:
 arXiv:0708.0584
 Bibcode:
 2007PhRvL..99u0407B
 Keywords:

 42.50.Xa;
 03.65.Ta;
 03.65.Ud;
 Optical tests of quantum theory;
 Foundations of quantum mechanics;
 measurement theory;
 Entanglement and quantum nonlocality;
 Quantum Physics
 EPrint:
 5 pages, 3 figures, 1 table