Google Quantum AI demonstrated magic state cultivation on its Willow processor. The method cuts errors by about 40 times compared to uncultivated states. It achieved a record 99.99% logical fidelity for T-states. The work solves a long-standing bottleneck in quantum computing. Magic states previously consumed up to 95% of a machine’s capacity. The team also showed compatibility between color codes and surface codes. The paper was published in Science. Further scaling is still needed for practical use.

• 40x error reduction
• 99.99% logical fidelity for T-states