title: Necessary and Sufficient Conditions for an Extended Noncontextuality in a Broad Class of Quantum Mechanical Systems.
abstract: The notion of (non)contextuality pertains to sets of properties measured one subset (context) at a time. We extend this notion to include so-called inconsistently connected systems, in which the measurements of a given property in different contexts may have different distributions, due to contextual biases in experimental design or physical interactions (signaling): a system of measurements has a maximally noncontextual description if they can be imposed a joint distribution on in which the measurements of any one property in different contexts are equal to each other with the maximal probability allowed by their different distributions. We derive necessary and sufficient conditions for the existence of such a description in a broad class of systems including Klyachko-Can-Binicioğlu-Shumvosky-type (KCBS), EPR-Bell-type, and Leggett-Garg-type systems. Because these conditions allow for inconsistent connectedness, they are applicable to real experiments. We illustrate this by analyzing an experiment by Lapkiewicz and colleagues aimed at testing contextuality in a KCBS-type system.
authors.affiliation: Department of Mathematical Information Technology, University of Jyväskylä, FI-40014 Jyväskylä, Finland.
authors.forename: Janne V
authors.initials: JV
authors.lastname: Kujala
authors.affiliation: Department of Psychological Sciences, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Ehtibar N
authors.initials: EN
authors.lastname: Dzhafarov
authors.affiliation: Department of Electrical Engineering, Linköping University, 58183 Linköping, Sweden.
authors.forename: Jan-Åke
authors.initials: JÅ
authors.lastname: Larsson