Experimental Test of Nonlocal Realistic Theories Without the Rotational Symmetry Assumption

Tomasz Paterek, Alessandro Fedrizzi, Simon Gröblacher, Thomas Jennewein, Marek Żukowski, Markus Aspelmeyer, Anton Zeilinger

Abstract

We analyze the class of nonlocal realistic theories that was originally considered by Leggett [Found. Phys. 33, 1469 (2003)] and tested by us in a recent experiment [Nature (London) 446, 871 (2007)]. We derive an incompatibility theorem that works for finite numbers of polarizer settings and that does not require the previously assumed rotational symmetry of the two-particle correlation functions. The experimentally measured case involves seven different measurement settings. Using polarization-entangled photon pairs, we exclude this broader class of nonlocal realistic models by experimentally violating a new Leggett-type inequality by 80 standard deviations.

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