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Identification Over Quantum Broadcast Channels

  • Uzi Pereg, Johannes Rosenberger, Christian Deppe

Identification over quantum broadcast channels is considered. As opposed to the information transmission task, the decoder only identifies whether a message of his choosing was sent or not. This relaxation allows for a double-exponential code size. An achievable identification region is derived for a quantum broadcast channel, and full characterization for the class of classical-quantum broadcast channels. The results are demonstrated for a depolarizing broadcast channel. Furthermore, the identification capacity region of the single-mode pure-loss bosonic broadcast channel is obtained as a consequence. In contrast to the single-user case, the capacity region for identification can be significantly larger than for transmission.

Uzi Pereg, Johannes Rosenberger, Christian Deppe

arXiv:2201.11056 [quant-ph]