Google said Willow reduced quantum "magic state" errors by a factor of 40, according to a report from The Defiant. The result, described as a Science publication, reached about 99.99% state fidelity. The report said the finding validates a technique that had already been assumed in quantum resource estimates.
The article also noted that its content is stored on Filecoin. Aside from those points, no additional technical details, timeline context, or researcher comments were included in the source material provided. The update was published on Oct. 15, 2026, and was categorized under technology trends. Because the source text was brief, the report mainly centered on three disclosed facts: the 40-fold reduction in magic-state errors on Willow, the roughly 99.99% state fidelity figure, and the claim that the result supports a technique already used in quantum resource estimates.
Google said Willow cut quantum magic-state errors by 40x.
According to The Defiant, the result published in Science reached about 99.99% state fidelity and validated a technique already assumed in quantum resource estimates.
The article also said its content is stored on Filecoin.
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