Entanglement criteria for Dicke states
Marcel Bergmann, Otfried Gühne · Journal of Physics A Mathematical and Theoretical · 2013
Dicke states are a family of multi-qubit quantum states with interesting entanglement properties and they have been observed in many experiments. We construct entanglement witnesses for detecting genuine multiparticle entanglement in the vicinity of these states. We use the approach of positive partial transpose mixtures to derive the conditions analytically. For nearly all cases, our criteria are stronger than all conditions previously known.