Qubit Zoo

A Scalable Open-Source QEC System with Sub-Microsecond Decoding-Feedback Latency

1 min read

Open-source multi-board RFSoC control and decoding hardware for low-latency quantum error correction. Zoo entry: classical-control.

Abstract

Liu et al. built a three-board ZCU216 prototype on the RISC-Q control architecture, integrating pulse control, syndrome aggregation, inter-board communication, decoding, and feedback distribution. The measured distance-3 decoding-feedback path took 446 ns. The paper extrapolates sub-microsecond performance through distance 21, but the reported prototype was not coupled to a live qubit processor.

Key Findings

  • Measured 446 ns end-to-end decoding-feedback latency for a distance-3 surface-code control-stack prototype.
  • Integrated control, communication, decoding, and feedback across three RFSoC boards.
  • Presented distance-21 sub-microsecond latency as an extrapolation from measured subsystem performance, not a processor-scale demonstration.

Verification Report

Author order was checked against the paper PDF title page on 2026-09-19. The arXiv page and latency claims were also verified.

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