A class of exposed indecomposable positive maps
Gniewomir Sarbicki, Dariusz Chruściński · Journal of Physics A Mathematical and Theoretical · 2012
Exposed positive maps in matrix algebras define a dense subset of extremal maps. We provide a class of indecomposable positive maps in the algebra of 2 n × 2 n complex matrices with n ⩾ 2. It is shown that these maps are exposed and hence define the strongest tool in entanglement theory to discriminate between separable and entangled states.