Bell-type inequalities to detect true n-body nonseparability

D Collins, N Gisin, S Popescu, D Roberts, V Scarani

Research output: Contribution to journalArticle (Academic Journal)peer-review

220 Citations (Scopus)


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.

Original languageEnglish
Article number170405
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Issue number17
Publication statusPublished - 29 Apr 2002

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