Experimental Falsification of Leggett's Non-Local Variable Model

Branciard, Cyril; Ling, Alexander; Gisin, Nicolas; Kurtsiefer, Christian; Lamas-Linares, Antia; Scarani, Valerio

Experimental Falsification of Leggett's Non-Local Variable Model

Authors

Branciard, Cyril

Ling, Alexander

Gisin, Nicolas

Kurtsiefer, Christian

Lamas-Linares, Antia

Scarani, Valerio

Description

Bell's theorem guarantees that no model based on local variables can reproduce quantum correlations. Also some models based on non-local variables, if subject to apparently "reasonable" constraints, may fail to reproduce quantum physics. In this paper, we introduce a family of inequalities, which allow testing Leggett's non-local model versus quantum physics, and which can be tested in an experiment without additional assumptions. Our experimental data falsify Leggett's model and are in agreement with quantum predictions.
5 pages, 3 figures, 1 table