Google’s Willow Chip Achieves Verifiable Quantum Advantage

In October 2025, Google’s Willow quantum processor achieved verifiable quantum advantage, marking the first time a quantum computer performed a calculation beyond the reach of classical systems with a result that can be efficiently verified.

• The experiment, demonstrated a quantum phenomenon called “quantum echoes” — a butterfly-effect-like behaviour in which small changes ripple chaotically through a quantum system.
• Willow completed the calculation 13,000 times faster than the Frontier supercomputer, which would take roughly 150 years to reproduce the result using classical computation.
• The verification can be done by another quantum computer of similar capability, overcoming one of the key challenges of quantum computing ....