title: Bell-type inequalities to detect true n-body nonseparability.
abstract: We analyze the structure of correlations among more than two quantum systems. We introduce a classification of correlations based on the concept of nonseparability, which is different a priori from the concept of entanglement. Generalizing a result of Svetlichny [Phys. Rev. D 35, 3066 (1987)] on three-particle correlations, we find an inequality for n-particle correlations that holds under the most general separability condition and that is violated by some quantum-mechanical states.
authors: H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom.
authors: Daniel
authors: D
authors: Collins
authors: Nicolas
authors: N
authors: Gisin
authors: Sandu
authors: S
authors: Popescu
authors: David
authors: D
authors: Roberts
authors: Valerio
authors: V
authors: Scarani