Google Quantum AI has demonstratively opened up a key bottleneck in quantum computing: we’ve shown that “magic state cultivation” works in practice on our Willow processor, reducing errors about 40x compared to without it. This breakthrough, published today in Science, is a crucial step towards scaling up quantum computing to practical use.The "magic state" bottleneckSince 2004, long before quantum computing was a practical engineering pursuit, researchers have foreseen a particularly tricky bot...