title: Simple test for hidden variables in spin-1 systems.
abstract: We resolve an old problem about the existence of hidden parameters in a three-dimensional quantum system by constructing an appropriate Bell's type inequality. This reveals the nonclassical nature of most spin-1 states. We shortly discuss some physical implications and an underlying cause of this nonclassical behavior, as well as a perspective of its experimental verification.
authors.affiliation: Faculty of Science, Bilkent University, Bilkent, Ankara, 06800 Turkey. klyachko@fen.bilkent.edu.tr
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Klyachko
authors.forename: M Ali
authors.initials: MA
authors.lastname: Can
authors.forename: Sinem
authors.initials: S
authors.lastname: Binicioğlu
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Shumovsky