title: Experimental violation of Bell's inequality beyond Tsirelson's bound.
abstract: The correlations between two qubits belonging to a three-qubit system can violate the Clauser-Horne-Shimony-Holt-Bell inequality beyond Tsirelson's bound [A. Cabello, Phys. Rev. Lett. 88, 060403 (2002)]. We experimentally demonstrate such a violation by 7 standard deviations by using a three-photon polarization-entangled Greenberger-Horne-Zeilinger state produced by Type-II spontaneous parametric down-conversion. In addition, using part of our results, we obtain a violation of the Mermin inequality by 39 standard deviations.
authors.affiliation: Physikalisches Institut, Universität Heidelberg, Philosophenweg 12, D-69120 Heidelberg, Germany. yuao@physi.uni-heidelberg.de
authors.forename: Yu-Ao
authors.initials: YA
authors.lastname: Chen
authors.forename: Tao
authors.initials: T
authors.lastname: Yang
authors.forename: An-Ning
authors.initials: AN
authors.lastname: Zhang
authors.forename: Zhi
authors.initials: Z
authors.lastname: Zhao
authors.forename: Adán
authors.initials: A
authors.lastname: Cabello
authors.forename: Jian-Wei
authors.initials: JW
authors.lastname: Pan