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IBM and partners publish three quantum-advantage results with built-in ways to validate the answers
IBM and partners published three experiments claiming quantum advantage, each with its own way of checking answers that classical computers cannot reproduce. Checking is the core problem with advantage claims: if no classical machine can compute the answer, it is hard to know the quantum one got it right. The results were submitted to IBM's public Quantum Advantage Tracker for scrutiny.
- IBM and UChicago ran a sampling task on 70 logical qubits, using built-in error-detection codes to certify the output; IBM reports about a 10x cut in effective gate error.
- Qedma, RIKEN and BlueQubit simulated a periodically driven magnet on up to 74 qubits, cross-checked on Quantinuum hardware; two leading classical methods missed the oscillations it found.
- Algorithmiq ran a 56-qubit 'echo' experiment measuring how information spreads, consistent across five quantum computers; three classical groups gave conflicting predictions.
- Caveat: none has an independent classical ground truth. Each check relies on internal codes, cross-device agreement or noise models.