By combining Qedma's advanced error mitigation software, QESEM, with IBM quantum computers, researchers observed complex and long-lived quantum dynamics in systems of up to 74 qubits. This enabled them to reach a paradigm where multiple state-of-the-art classical approaches failed to provide consistent, reliable answers.

The results mark the first time quantum advantage has been achieved with commercially available hardware and software to establish error-mitigated, advanced quantum computers as trusted scientific instruments for exploring physics that could lead to better and ultrafast optoelectronics, light-induced superconductors, and other advanced materials applications.

Exploring Physics at the Classical Frontier

The collaboration investigated the subtle, oscillatory dynamics of a two-dimensional Floquet Ising model, which is a system that physicists use to study how a material's magnetic properties evolve when rhythmically driven by external pulses. Understanding whether such oscillations persist in larger systems has remained an open challenge because the relevant regimes rapidly overwhelm classical computational methods. Using an IBM quantum computer, which is powered by the IBM Quantum Heron processor and available on the cloud, together with Qedma's Quantum Error Suppression and Error Mitigation (QESEM) software, which is also available on the cloud, the team was able to resolve these dynamics with precision.

Beyond Leading Classical Methods

To evaluate the significance of the quantum results, the team worked with RIKEN, Japan's leading national comprehensive research institute, and BlueQubit, a leading developer of large-scale quantum circuit simulation technology, to compare them against state-of-the-art classical simulation approaches that spanned fundamentally different computational strategies. As the system grew in complexity over time, none of the classical approaches could consistently agree at the scale reached by the quantum experiments, even when run on Fugaku, one of the world's most powerful supercomputers. By contrast, the error-mitigated quantum results remained consistent and revealed clear, long-time oscillatory behavior. To enable continued classical benchmarking from the community, the team publicly released the quantum circuits and results to the Quantum Advantage Tracker, prior to the arXiv pre-print released this week.

Building Trust Through Validation

A defining feature of the study is its extensive validation strategy. The team first employed an unbiased error-mitigation protocol against classical calculations wherever such comparisons remained possible, before pushing the protocol to the point where these classical simulations lost accuracy. Then, they benchmarked a more scalable mitigation approach against those trusted results before extending to larger system sizes and longer evolution times. Independent validation was also performed across quantum hardware platforms, including trapped-ion systems from Quantinuum. The consistent behavior observed across technologies provided additional evidence that the measured physics originated from the simulated quantum system, rather than from device-specific or mitigation errors.