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

          @misc{ scivideos_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 for Theoretical Physics},
            year = {2025},
            month = {oct},
            note = {PIRSA:25100056 see, \url{https://scivideos.org/index.php/pirsa/25100056}}
          }
          

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.