Fast and accurate neural triage decoding of ultra-high-rate quantum LDPC codes

The paper introduces neural triage decoding, a new framework for high‑rate quantum LDPC codes that adaptively uses neural message‑passing to predict error corrections, followed by iterative refinement and a rare diversification step. It demonstrates that the Triage decoder can handle ultra‑high‑rate codes encoding hundreds of logical qubits, achieving near‑optimal accuracy while reducing decoding latency by one to two orders of magnitude compared to existing decoders. The approach is grounded in a rigorous analysis of bitwise marginal decoding and shows robustness to mismatched error priors.

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