A simple test for hidden variables in spin-1 system

Alexander A. Klyachko, M. Ali Can, Sinem Binicioğlu, Alexander S. Shumovsky

Published 2007-06-01, updated 2008-07-15Version 4

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 a 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.