PIRSA:25100056

Chemistry beyond the scale of exact diagonalization on a quantum-centric supercomputer

Mezzacapo, A. (2025). Chemistry beyond the scale of exact diagonalization on a quantum-centric supercomputer. Perimeter Institute. https://pirsa.org/25100056

Mezzacapo, Antonio. Chemistry beyond the scale of exact diagonalization on a quantum-centric supercomputer. Perimeter Institute, Oct. 09, 2025, https://pirsa.org/25100056 

          @misc{ pirsa_PIRSA:25100056,
            doi = {10.48660/25100056},
            url = {https://pirsa.org/25100056},
            author = {Mezzacapo, Antonio},
            keywords = {Quantum Information},
            language = {en},
            title = {Chemistry beyond the scale of exact diagonalization on a quantum-centric supercomputer},
            publisher = {Perimeter Institute},
            year = {2025},
            month = {oct},
            note = {PIRSA:25100056 see, \url{https://pirsa.org}}
          }

Antonio Mezzacapo IBM Research - Thomas J. Watson Research Center

Talk numberPIRSA:25100056
DOI10.48660/25100056
Collection
Talk Type Conference
Subject

Abstract

In this talk, I will discuss quantum diagonalization methods, based on subspaces obtained from quantum computers, which overcome the scaling limitations of variational algorithms and enabled realistic chemistry computations of up to 77 qubits on a quantum centric supercomputing architecture, using a Heron quantum processor and the RIKEN supercomputer Fugaku. Merging these ideas with Krylov quantum subspaces, I will present a ground state algorithm with convergence similar to phase estimation and robustness to noise, which led to an experimental demonstration for lattice ground state problems obtained with Heron processors and the supercomputer Frontier.