Optimal spin squeezing inequalities detect bound entanglement in spin models

Abstract

We determine the complete set of generalized spin squeezing inequalities. These are entanglement criteria that can be used for the experimental detection of entanglement in a system of spin-1/2 particles in which the spins cannot be individually addressed. They can also be used to show the presence of bound entanglement in the thermal states of several spin models.

5 pages, 2 figures, 1 table; small changes, published version

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