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Phys. Rev. Lett. 99, 210407 (2007) [4 pages]

Experimental Falsification of Leggett’s Nonlocal Variable Model

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Cyril Branciard1, Alexander Ling2,3, Nicolas Gisin1, Christian Kurtsiefer2, Antia Lamas-Linares2, and Valerio Scarani2
1Group of Applied Physics, University of Geneva, Switzerland
2Centre for Quantum Technologies, National University of Singapore, Singapore
3Temasek Laboratories, National University of Singapore, Singapore

Received 14 August 2007; published 21 November 2007

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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.210407
DOI:
10.1103/PhysRevLett.99.210407
PACS:
42.50.Xa, 03.65.Ta, 03.65.Ud
 
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