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Separability criterion for three-qubit states with a four dimensional norm (1705.05557v2)
Published 16 May 2017 in quant-ph
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.