Quantum communication: a discrimination approach

arXiv:2610.40358v2 Announce Type: replace-cross Abstract: We develop a state discrimination approach to unassisted quantum communication through a noisy quantum channel. Starting from the operational duality between entanglement recovery and state discrimination, we construct entanglement-generation codes with explicit decoders constructed from Petz recovery maps. The resulting error bounds hold for every number of channel uses and are expressed in terms of Petz-R\'enyi coherent information. For product sources, they yield exponential error decay at rates below coherent information.