title: Experimental fully contextual correlations.
abstract: Quantum correlations are contextual yet, in general, nothing prevents the existence of even more contextual correlations. We identify and test a noncontextuality inequality in which the quantum violation cannot be improved by any hypothetical postquantum theory, and use it to experimentally obtain correlations in which the fraction of noncontextual correlations is less than 0.06. Our correlations are experimentally generated from the results of sequential compatible tests on a four-state quantum system encoded in the polarization and path of a single photon.
authors.affiliation: Department of Physics, Stockholm University, S-10691 Stockholm, Sweden.
authors.forename: Elias
authors.initials: E
authors.lastname: Amselem
authors.forename: Lars Eirik
authors.initials: LE
authors.lastname: Danielsen
authors.forename: Antonio J
authors.initials: AJ
authors.lastname: López-Tarrida
authors.forename: José R
authors.initials: JR
authors.lastname: Portillo
authors.forename: Mohamed
authors.initials: M
authors.lastname: Bourennane
authors.forename: Adán
authors.initials: A
authors.lastname: Cabello