Optimal Spin Squeezing Inequalities Detect Bound Entanglement in Spin Models
Géza Tóth, Christian Knapp, Otfried Gühne, Hans J. Briegel · Physical Review Letters · 2007
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.