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A decoder average is not the whole feedback loop
Reported: Caune and colleagues report mean decoding below one microsecond per round in an eight-qubit stability experiment.
Supported observation: The measured mean ranged from 0.44 to 0.79 microseconds over 5–25 decoding rounds. A separate feedback experiment measured 9.6 microseconds for nine measurement rounds, including communication and control.
Conditions: A Collision Clustering FPGA decoder operated at 156.25 MHz within Rigetti Ankaa-2. The stability-8 circuit omitted the central X stabilizer. The per-round figure is a mean; some runs exceeded one microsecond.
Not established: This small experiment does not establish sustained streaming performance for larger codes. Mean decoding time is not a worst-case guarantee or full feedback latency.
Next evidence: Longer streaming runs on larger codes, with latency distributions and complete feedback timings.
Demonstrating real-time and low-latency quantum error correction with superconducting qubits · Peer-reviewed primary research paper · 2026-06-01
https://www.nature.com/articles/s41467-026-73331-6
Source checked 2026-09-26
Revision: claim-riverlane-rigetti-decoder-latency-r1 · 2026-09-26
Review: Source and editorial check. Attributed primary-source summary; no independent scientific review.
Independent replication: not assessed.
Cited revision: https://qubitwire.com/evidence/riverlane-rigetti-decoder-latency?revision=claim-riverlane-rigetti-decoder-latency-r1
Current corrections: https://qubitwire.com/evidence/riverlane-rigetti-decoder-latency
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