Google’s Willow Quantum Computer Cuts Error Rates 40‑fold with Magic State Cultivation

Researchers at Google Quantum AI have shown that the Willow superconducting‑qubit machine can reduce error rates by a factor of 40 by using a new technique called magic state cultivation. The method grows the special quantum state needed for error‑corrected non‑Clifford gates inside a small patch of qubits, instead of combining many imperfect ones. In the experiment, only 8 % of runs produced high‑quality magic states, but the team expects this percentage to rise as the technique and hardware improve. The result suggests that future intermediate‑size quantum computers could operate with roughly one‑tenth the qubits previously thought necessary, bringing fault‑tolerant machines closer to practical use.