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What changed

Google Quantum AI and collaborators reported a surface-code memory on the Willow processor whose logical errors fell as the code grew. It is evidence for a key requirement of error correction, not a useful fault-tolerant computation.

Sources: [1]

Sources and review scope

Source-linked. Editorial review: .

  1. Quantum error correction below the surface code threshold ↗

    Google Quantum AI and collaborators, research manuscript · Accessed 2026-10-02

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Progress · Hardware

A quantum memory below threshold

A dated error-correction result illustrates what a milestone can and cannot establish.