Bell-type inequalities to detect true n-body non-separability

Abstract

We analyze the structure of correlations among more than two quantum systems. We introduce a classification of correlations based on the concept of non-separability, which is different {\em a priori} from the concept of entanglement. Generalizing a result of Svetlichny [Phys. Rev. D {\bf 35} (1987) 3066] on 3-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.

4 pages, no figures, minor revisions

References in corpus (2)

• All multipartite Bell correlation inequalities for two dichotomic observables per site
• Spectral decomposition of Bell's operators for qubits

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