ON CAPACITIES OF QUANTUM CHANNELS
Masanori Ohya
Dénes Petz
Noboru Watanabe
Abstract: Capacities of quantum mechanical channels are defined in terms of mutual
information quantities. Geometry of the relative entropy is used to express capacity as a
divergence radius. The symmetric quantum spin channel and the attenuation channel of
Boson fields are discussed as examples.
2000 AMS Mathematics Subject Classification: Primary: -; Secondary: -;
Key words and phrases: -