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Achievable Rate Regions for Multi-terminal Quantum Channels via Coset Codes
Fatma Gouiaa, Arun Padakandla·March 10, 2025
cs.ITQuantum Physics
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Abstract
We undertake a Shannon theoretic study of the problem of communicating bit streams over a 3-user quantum interference channel (QIC) and focus on characterizing inner bounds. Adopting the powerful technique of tilting, smoothing, and augmentation discovered by Sen recently, and combining with our coset code strategy, we derive a new inner bound to the classical-quantum capacity region of a 3-user QIC. The derived inner bound subsumes all currently known bounds and is proven to be strictly larger for identified examples.