title: Note on entropies for quantum dynamical systems.
abstract: Quantum entropy and channel are fundamental concepts for quantum information theory progressed recently in various directions. We will review the fundamental aspects of mean entropy and mean mutual entropy and calculate them for open system dynamics.
authors.affiliation: Department of Information Sciences, Tokyo University of Science, Noda City, Chiba 278-8510, Japan watanabe@is.noda.tus.ac.jp.
authors.forename: Noboru
authors.identifier: http://orcid.org/0000-0002-8090-8988
authors.initials: N
authors.lastname: Watanabe
keywords: mean entropy; open systems; quantum dynamical systems; quantum entropy