Matching bounds for zero-error list decoding of pure-state CQ channels coincide under PSD overlap matrices, but the sphere-packing rate may not be achievable even for arbitrarily large fixed list sizes.
Achieving the holevo capacity of a pure state classical-quantum channel via unambiguous state discrimi- nation
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Zero-Error List Decoding for Classical-Quantum Channels
Matching bounds for zero-error list decoding of pure-state CQ channels coincide under PSD overlap matrices, but the sphere-packing rate may not be achievable even for arbitrarily large fixed list sizes.