|Universal superposition codes: capacity regions of compound quantum broadcast channel with confidential messages
|Holger Boche, Gisbert Janssen, Sajad Saeedinaeeni, Technische Universität München, Germany
|Q.6: Quantum Networks
|Quantum Systems, Codes, and Information
|Click here to download the manuscript
|Click here to watch in the Virtual Symposium
|We derive universal codes for transmission of broadcast and confidential messages over classical-quantum-quantum and fully quantum channels. These codes are robust to channel uncertainties considered in the compound model. To construct these codes we generalize random codes for transmission of public messages, to derive a universal superposition coding for the compound quantum broadcast channel. As an application, we give a multi-letter characterization of regions corresponding to capacity of the compound quantum broadcast channel for transmitting broadcast and confidential messages simultaneously. This is done for two types of broadcast messages, one called public and the other common.