A Scalable Open-Source RISC-V-Based Quantum Error Correction System with Sub-Microsecond Decoding Latency: Part II

Quantum error correction (QEC) is essential for realizing large-scale quantum computation, yet its practical implementation remains a major engineering challenge. In particular, QEC demands precise real-time control of a large number of qubits and low-latency, high-throughput decoding of error syndromes. To address these challenges, we present an open-source quantum error correction system built on RISC-Q, a generator for RISC-V-based quantum control systems. Our system, implemented on RFSoC FPGAs, achieves real-time qubit control, a scalable distributed multi-board architecture, and a low-latency QEC decoding pipeline with sub-microsecond (<1 μs) latency for configurations up to 56 qubits. In the second part, we will present the design of our quantum error correction system, including its distributed architecture, QEC decoding pipeline, and performance evaluation.