Repozytorium publikacji - Politechnika Gdańska

We study subadditivity of the minimum output entropy (Hmin) of quantum multiple access channels (MACs). We provide an example of violation of the additivity theorem for Hmin known in classical information theory. Our result is based on a fundamental property of MACs, i.e., independence of each sender. The channels used in the example can be constructed explicitly. On the basis of subadditivity of Hmin we also provide an example of extremal superadditivity (superactivation) of the classical capacity region of MACs.

Autorzy

• dr inż. Łukasz Czekaj link otwiera się w nowej karcie