title: 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.
authors.affiliation: Group of Applied Physics, University of Geneva, Switzerland.
authors.forename: Cyril
authors.initials: C
authors.lastname: Branciard
authors.forename: Alexander
authors.initials: A
authors.lastname: Ling
authors.forename: Nicolas
authors.initials: N
authors.lastname: Gisin
authors.forename: Christian
authors.initials: C
authors.lastname: Kurtsiefer
authors.forename: Antia
authors.initials: A
authors.lastname: Lamas-Linares
authors.forename: Valerio
authors.initials: V
authors.lastname: Scarani