Google demonstrates magic state cultivation on Willow chip, cutting errors 40x to 99.99% fidelity
rohanpaul_ai · x · 2026-10-17
- Google Quantum AI demonstrated "magic state cultivation" on physical hardware for the first time, published in Science.
- Context: quantum computers need consumable "magic states" for operations beyond classical machines, but producing clean ones may consume up to 95% of a machine's capacity by some estimates.
- The new method checks each state and discards flawed attempts, cutting errors 40x on the 105-qubit Willow chip and reaching a record 99.99% logical fidelity. Only 8% of attempts survived, and scaling remains unproven.
- It also validates on real hardware one method behind Google's estimate that RSA-2048 could be broken with under 1M qubits.
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