Do all pure entangled states violate Bell's inequalities for correlation functions?

Physics – Quantum Physics

Scientific paper

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4 pages, journal version

Scientific paper

10.1103/PhysRevLett.88.210402

Any pure entangled state of two particles violates a Bell inequality for two-particle correlation functions (Gisin's theorem). We show that there exist pure entangled N>2 qubit states that do not violate any Bell inequality for N particle correlation functions for experiments involving two dichotomic observables per local measuring station. We also find that Mermin-Ardehali-Belinskii-Klyshko inequalities may not always be optimal for refutation of local realistic description.

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