Quantum error correction enables practical quantum computing by merging physical qubits into logical qubits, achieving exponential error suppression below critical physical error thresholds.
Our distance-7 code, integrated in the Willow processor, demonstrates a significant suppression of logical error rates by a factor of 2.14, achieving only 0.143% error per cycle.
Maintaining below-threshold performance with real-time decoding, our system reaches an impressive average decoder latency of 63 s at distance-5 across a million cycles.
Our findings indicate that the logical performance is hindered by rare correlated error events occurring approximately once every hour, well within scaled operational needs.
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