Constructions of indecomposable positive maps based on a new criterion   for indecomposability
  We give a criterion for a positive mapping on the space of operators on a Hilbert space to be indecomposable. We show that this criterion can be applied to two families of positive maps. These families of maps can then be used to form separability criteria for bipartite quantum states that can detect the entanglement of bound entangled quantum states. 
William Hall (University of York)