# Google cuts magic-state errors about 40-fold on its Willow chip, removing one bottleneck on the path to attacks on exposed bitcoin keys

Researchers note that breaking RSA-2048 still needs magic states roughly a million times cleaner, while Aztec has set the end of 2030 as its target for a full post-quantum migration.

- Published: 2026-10-18T05:40:05.953Z
- Canonical: https://polylog.news/crypto/2026-10-18/google-cuts-magic-state-errors-about-40-fold-on-its-willow-c
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [CoinDesk](https://www.coindesk.com/tech/2026/10/16/satoshi-era-bitcoin-faces-a-bigger-quantum-threat-after-google-s-new-willow-breakthrough), [CoinDesk (NIST seeds)](https://www.coindesk.com/tech/2026/10/17/wow-it-s-a-real-discovery-claude-cracks-a-25-year-nsa-number-mystery), [Decrypt](https://decrypt.co/381102/google-cracked-quantum-computing-biggest-bottlenecks), [Interesting Engineering](https://interestingengineering.com/science/google-willow-quantum-chip-magic-state-errors), [Crypto Economy](https://crypto-economy.com/aztec-plans-major-blockchain-overhaul-by-2030-to-prepare-for-quantum-threats)

Google Quantum AI says a technique called magic state cultivation cut errors about 40-fold on its Willow processor and produced magic states with 99.99% fidelity, in work published in Science. Magic states are single-use resources that a qu…

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