Google Willow Chip Shows First Verifiable Quantum Advantage
Why in the news
Google Quantum AI announced on 23 October 2025 that its Willow quantum chip achieved what it calls the first verifiable quantum advantage. The work was published in the journal Nature.
Key facts
- Chip: Willow, described as having up to 105 qubits.
- Algorithm: Quantum Echoes, which measures the out-of-time-order correlator (OTOC), an indicator of how information scrambles as qubits interact.
- Speed: about 13,000 times faster than the best classical algorithm on leading supercomputers; a task needing years classically took about two hours.
- Verifiable: other quantum computers can repeat or confirm the result.
| Term | Meaning here |
|---|---|
| Willow | Google’s quantum chip |
| OTOC | Measure of information scrambling |
| NMR | Nuclear magnetic resonance, used to test molecular analysis |
Why it matters
The method acts as a molecular ruler, helping learn parameters of molecules by comparing simulation with NMR data (Hamiltonian learning). Google’s CEO Sundar Pichai said it could speed up drug design and materials science. It builds on the 2019 Sycamore chip, which first showed quantum supremacy.
Exam angle
- Remember Willow (chip), Quantum Echoes (algorithm) and the Nature publication.
- The new point is that the advantage is verifiable, unlike earlier demonstrations.
- Do not confuse with Sycamore (2019).