We present two approaches for transmitting classical information over quantum
broadcast channels. The first technique is a quantum generalization of the
superposition coding scheme for the classical broadcast channel. We use a
quantum simultaneous nonunique decoder and obtain a proof of the rate region
stated in [Yard et al., IEEE Trans. Inf. Theory 57 (10), 2011]. Our second
result is a quantum generalization of the Marton coding scheme. The error
analysis for the quantum Marton region makes use of ideas in our earlier work
and an idea recently presented by Radhakrishnan et al. in arXiv:1410.3248. Both
results exploit recent advances in quantum simultaneous decoding developed in
the context of quantum interference channels.Comment: v4: 20 pages, final version to appear in IEEE Transactions on
Information Theor
