Amselem, Elias; Danielsen, Lars Eirik; López-Tarrida, Antonio J.; Portillo, José R.; Bourennane, Mohamed; Cabello, Adán (American Physical Society, 2012)
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 ...