Bell-type inequalities for partial separability in N-particle systems and quantum mechanical violations

Abstract

We derive N-particle Bell-type inequalities under the assumption of partial separability, i.e. that the N-particle system is composed of subsystems which may be correlated in any way (e.g. entangled) but which are uncorrelated with respect to each other. These inequalities provide, upon violation, experimentally accessible sufficient conditions for full N-particle entanglement, i.e. for N-particle entanglement that cannot be reduced to mixtures of states in which a smaller number of particles are entangled. The inequalities are shown to be maximally violated by the N-particle Greenberger-Horne-Zeilinger (GHZ) states.

4 pages, Published by Physical Review Letters. Final version

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• Bell-type inequalities to detect true n-body non-separability
• Sufficient conditions for three-particle entanglement and their tests in recent experiments
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