Separability criterion for three-qubit states with a four dimensional norm
Lin Chen, Kyung Hoon Han, Seung-Hyeok Kye · Journal of Physics A Mathematical and Theoretical · 2017
Abstract We give a separability criterion for three qubit states in terms of diagonal and anti-diagonal entries. This gives us a complete characterization of separability when all the entries are zero except for diagonal and anti-diagonals. The criterion is expressed in terms of a norm arising from anti-diagonal entries. We compute this norm in several cases, so that we get criteria with which we can decide the separability by routine computations.