2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/157903We construct a new class of positive indecomposable maps in the algebra of 'd x d' complex matrices. Each map is uniquely characterized by a cyclic bistochastic matrix. This class generalizes a Choi map for d=3. It provides a new reach family of indecomposable entanglement witnesses which define important tool for investigating quantum entanglement.18 pagesQuantum PhysicsMathematical Physicstext