Speaker
Description
Quantum computers are opening new opportunities for exploring quantum many-body systems, both as programmable platforms for studying nonequilibrium dynamics and as computational tools within hybrid quantum-classical workflows. In this talk, I will present recent progress in these two directions, focusing first on quantum dynamics experiments on digital quantum processors [1-4] and then on hybrid quantum-HPC computation for many-body physics and chemistry [5-7].
I will begin with recent experiments on nonequilibrium quantum dynamics in programmable superconducting-qubit systems, including Floquet many-body dynamics in regimes that are difficult to access with classical simulations alone. These studies demonstrate that present-day quantum processors can already serve as valuable experimental platforms for exploring complex many-body phenomena, especially when combined with classical verification methods such as tensor-network simulations.
I will then discuss quantum-classical hybrid computation that integrate quantum hardware with high-performance classical computing to address problems beyond the reach of conventional exact diagonalization. Representative examples include selected configuration interaction approaches for ground-state calculations, as well as quantum-enhanced tensor-network approaches. Enabled by close integration between on-premise quantum processors and large-scale supercomputers such as Fugaku, these approaches illustrate how hybrid architectures can extend the frontier of practically tractable computation.
These developments point to a new regime of quantum computational science, in which quantum processors play a dual role: as experimental platforms for probing quantum many-body dynamics and as accelerators within hybrid computational workflows. This combined perspective offers a practical route toward scientifically meaningful quantum advantage before the advent of fully fault-tolerant quantum computing
[1] K. Shinjo, K. Seki, T. Shirakawa, R.-Y. Sun, and S. Yunoki, “Unveiling clean two-dimensional discrete time crystals on a digital quantum computer”, arXiv:2403.16718.
[2] K. Shinjo, K. Seki, and S. Yunoki, “Noise-stabilized discrete time crystals on digital quantum processors”, arXiv:2510.13577.
[3] K. Shinjo, K. Seki, and S. Yunoki, “Quantum synchronization and chimera states in a programable quantum many-body system”, arXiv:2603.11910.
[4] K. Nagao, T. Shirakawa, R.-Y. Sun, P. Prelovsek, and S. Yunoki, “Probing many-body localization crossover in quasiperiodic Floquet circuits on a quantum processor”, arXiv:2603.12675.
[5] J. Robledo-Moreno et al., “Chemistry beyond the scale of exact diagonalization on a quantum-centric supercomputer”, Science Advances 11, eadu9991 (2025).
[6] T. Shirakawa et al., “Closed-loop calculations of electronic structure on a quantum processor and a classical supercomputer at full scale”, arXiv:2511.00224.
[7] P. Yoo ei al., “Extending the handover-iterative VQE to challenging strongly correlated systems: N2 and Fe-S cluster”, arXiv:2601.08137.