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Google’s Willow chip shows ‘magic state cultivation,’ cutting errors 40x as crypto watches Q-day
Summary
Google Quantum AI said a technique called magic state cultivation cut errors about 40-fold on its Willow processor and produced T-states with 99.99% logical fidelity, Decrypt and The Block reported after a Science paper published Thursday.
Decrypt said magic states are scarce resources for useful quantum programs and that some estimates put making them at up to 95% of a machine’s capacity; Google framed cultivation as a cheaper filter-style alternative to large distillation factories.
Both outlets linked the work to longer-term encryption risk: Decrypt noted cultivation underpins estimates that RSA-2048 could fall with under a million noisy qubits, while stressing the experiment used at most 54 of Willow’s 105 qubits and is far from wallet-breaking scale.
The Block cited observers including Nic Carter saying there is no imminent threat but that AI is accelerating quantum progress, and Project Eleven’s Alex Pruden saying the result mainly validates assumptions already baked into Q-day timelines.
Key facts
- Magic state cultivation on Willow cut errors about 40-fold and reached 99.99% T-state logical fidelity.
- Some estimates put magic-state production at up to 95% of a quantum computer’s capacity.
- Decrypt said the experiment used at most 54 of Willow’s 105 qubits and that breaking RSA-2048 would need far lower error rates.
- The Block reported Coinbase this week urged Bitcoin post-quantum preparation as a multi-year process.