Symmetry-Aware INT4 Quantized GNN Decoder: ASIC Synthesis and Low-Latency Surface Code Architecture
Real-time quantum error correction for superconducting processors requires decoding streaming syndrome data within microsecond cycle intervals (T_cycle ≈ 1.1 μs). Classical minimum-weight perfect matching executed on host processors suffers from communication and serial matching bottlenecks, creating an exponential dec...