Detection of N-particle entanglement with generalized Bell inequalities

Abstract

We show that the generalized Bell-type inequality, explicitly involving rotational symmetry of physical laws, is very efficient in distinguishing between true N-particle quantum correlations and correlations involving less particles. This applies to various types of generalized partial separabilities. We also give a rigorous proof that the new Bell inequalities are maximally violated by the GHZ states, and find a very handy description of the N-qubit correlation function.

5 pages, minor typos corrected, journal version

References in corpus (2)

• Rotational invariance as an additional constraint on local realism
• Addendum to "Sufficient conditions for three-particle entanglement and their tests in recent experiments"

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