Exposed positive maps: a sufficient condition
  Exposed positive maps in matrix algebras define a dense subset of extremal maps. We provide a sufficient condition for a positive map to be exposed. This is an analog of a spanning property which guaranties that a positive map is optimal. We analyze a class of decomposable maps for which this condition is also necessary. 
Dariusz Chru\'sci\'nski, Gniewomir Sarbicki
quant-ph math-ph math.MP