Google Demonstrates Magic State Cultivation on Willow Chip, Cutting Error Rates 40x
Google CEO Sundar Pichai announced on October 16 that the Google Quantum AI team has, for the first time, demonstrated "magic state cultivation" on physical hardware: magic states prepared on the 105-qubit Willow processor show roughly 40x lower error rates than previous methods, with fidelity reaching 99.99%—a record for this class. The results were formally published in Science and are seen as a key step toward practical fault-tolerant quantum computing.
Confirmed
- Magic state cultivation was demonstrated on the Willow processor, cutting error rates roughly 40x versus not using the technique (multiple posts consistently relay the official information).
- Magic state preparation fidelity reached 99.99%, as relayed from the Science report by @Gaiden206, @ymatias, @ZeroStateReflex and others.
- The chip is the 105-qubit Willow processor (@ZeroStateReflex citing unusualwhales).
- The findings were published as a paper in Science, and Google simultaneously released an official blog post, "Bringing the magic: Google breaks open a bottleneck in quantum computing," detailing the technical principles (@sundarpichai, @ymatias).
Why it matters
- Magic state preparation has long been one of the most serious bottlenecks in quantum computing: as @ymatias noted, conventional methods can consume large amounts of processor resources, making fault-tolerant computing hard to practicalize.
- This validation was done on physical hardware rather than merely in theory or simulation, with an order-of-magnitude drop in error rates, offering a viable path toward scaled fault-tolerant quantum computing.
- Google's CEO personally made the announcement along with an official technical blog post, signaling the company views this as a milestone-level advance in quantum computing.
2026-10-16 ~ 2026-10-16 · 7 related posts
Primary sources
- [source] Google's Willow achieves Magic State Cultivation, cutting errors ~40x — Gaiden206 · 2026-10-16
- [source] Google demos magic state cultivation on Willow, cutting errors 40x with 99.99% fidelity — sundarpichai · 2026-10-16
- [source] Google blog details how magic state cultivation breaks a quantum computing bottleneck — sundarpichai · 2026-10-16
- Google hits record 99.99% fidelity on magic states with 105-qubit Willow chip — ZeroStateReflex · 2026-10-16
- Google publishes official blog breaking down its Willow magic state breakthrough — ymatias · 2026-10-16