title: Preface of the special issue quantum foundations: information approach.
abstract: This special issue is based on the contributions of a group of top experts in quantum foundations and quantum information and probability. It enlightens a number of interpretational, mathematical and experimental problems of quantum theory.
authors.affiliation: Dipartimento di Fisica, Università di Pavia, Pavia 27100, Italy.
authors.forename: Giacomo Mauro
authors.identifier: http://orcid.org/0000-0003-0602-5519
authors.initials: GM
authors.lastname: D'Ariano
authors.affiliation: International Center for Mathematical Modeling in Physics and Cognitive Sciences Linnaeus University, Växjö-Kalmar, Sweden andrei.khrennikov@lnu.se.
authors.forename: Andrei
authors.identifier: http://orcid.org/0000-0002-9587-0938
authors.initials: A
authors.lastname: Khrennikov
keywords: Copenhagen interpretation; QBism; cognition; information; principle of plenitude; reconstruction