Source: wikibot/choi-s-theorem-on-completely-positive-maps
= Choi's theorem on completely positive maps
{wiki=Choi's_theorem_on_completely_positive_maps}
Choi's theorem is an important result in the theory of completely positive (CP) maps in the context of operator algebras and quantum information theory. It provides a characterization of completely positive maps in terms of their action on matrices.