A Mirror-Descent Algorithm for Computing the Petz-Rényi Capacity of Classical-Quantum Channels

Yu-Hong Lai, Hao-Chung Cheng

We study the computation of the $\alpha$-Rényi capacity of a classical-quantum (c-q) channel for $\alpha \in (0,1)$. We propose an exponentiated-gradient (mirror descent) iteration that genera…