Optimal entanglement witnesses from generalized reduction and Robertson maps
Dariusz Chruściński, Justyna Pytel · Journal of Physics A Mathematical and Theoretical · 2011
We provide a generalization of the reduction and Robertson positive maps in matrix algebras. They give rise to a new class of optimal entanglement witnesses. Their structural physical approximation is analyzed. As a byproduct we provide new examples of PPT (positive partial transpose) entangled states.