On Kadison-Schwarz Approximation to Positive Maps
Dariusz Chruściński, Farrukh Maksutovich Mukhamedov, Mohamed Ali Hajji · Open Systems & Information Dynamics · 2020
We analyze Kadison-Schwarz approximation to positive maps in matrix algebras. This is an analogue of the well known structural physical approximation to positive maps used in entanglement theory. We study several known maps both decomposable (like transposition) and non-decomposable (like Choi map and its generalizations).