title: Experimental test of nonlocal realistic theories without the rotational symmetry assumption.
abstract: We analyze the class of nonlocal realistic theories that was originally considered by Leggett [Found. Phys. 33, 1469 (2003)10.1023/A:1026096313729] and tested by us in a recent experiment [Nature (London) 446, 871 (2007)10.1038/nature05677]. 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.
authors.affiliation: Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Paterek
authors.forename: Alessandro
authors.initials: A
authors.lastname: Fedrizzi
authors.forename: Simon
authors.initials: S
authors.lastname: Gröblacher
authors.forename: Thomas
authors.initials: T
authors.lastname: Jennewein
authors.forename: Marek
authors.initials: M
authors.lastname: Zukowski
authors.forename: Markus
authors.initials: M
authors.lastname: Aspelmeyer
authors.forename: Anton
authors.initials: A
authors.lastname: Zeilinger