Google Willow Advances Quantum Computing, but Bitcoin Remains Safe

Google says its Willow quantum processor cut errors in specially prepared “magic states” by about 40 times, with accepted states reaching 99.99% fidelity. The result, published in Science, is an engineering advance towards fault-tolerant quantum computing—not a 40-fold increase in computing power or evidence that Bitcoin can be cracked today. Only about 8% of state-preparation attempts were retained, and the method has yet to be scaled for longer calculations. The findings add detail to earlier estimates of the quantum threat to Bitcoin. A separate Google study modeled one attack requiring fewer than 1,200 logical qubits and 90 million Toffoli gates. Another model estimated that recovering a key about nine minutes after its public key is exposed would require a future machine producing roughly 500,000 reliable magic states per second. These are theoretical estimates; error correction and other engineering challenges leave a substantial gap between current hardware and a machine capable of attacking Bitcoin’s elliptic-curve signatures with Shor’s algorithm. Some older Bitcoin holdings have public keys visible on-chain, but recent movements of dormant coins do not prove holders are responding to quantum risk. For traders, Google Willow is a long-term Bitcoin wallet-security development, not a direct catalyst for an immediate price move. The timing and design of any shift to quantum-resistant signatures remain uncertain.