Quantum computers must operate in concert with classical computers to deliver on the promise of quantum advantage for practical problems. To achieve that, it is important to understand how quantum and classical computing can interact together, and how one can characterize the scalability and efficiency of hybrid quantum–classical workflows. So far, early experiments with quantum-centric supercomputing workflows have been limited in scale and complexity. Here, we use a Heron quantum processor deployed on premises with the entire supercomputer Fugaku to perform the largest computation of electronic structure involving quantum and classical high-performance computing. We design a closed-loop workflow between the quantum processors and 152,064 classical nodes of Fugaku, to approximate the electronic structure of chemistry models beyond the reach of exact diagonalization, with accuracy comparable to some all-classical approximation methods. Our work pushes the limits of the integration of quantum and classical high-performance computing, showcasing computational resource orchestration at the largest scale possible for current classical supercomputers.

Article Free Access Share on QCDPAX-an MIMD array of vector processors for the numerical simulation of quantum chromodynamics Authors: T. Shirakawa Institute of Engineering Mechanics Institute of Engineering MechanicsView Profile , T. Hoshino Institute of Engineering Mechanics Institute of Engineering MechanicsView Profile , Y. Oyanagi Institute of Information Sciences Institute of Information SciencesView Profile , Y. Iwasaki Institute of PiIysics, University of Tsukuba, Tsukuba, Ibaraki 305, JAPAN Institute of PiIysics, University of Tsukuba, Tsukuba, Ibaraki 305, JAPANView Profile , T. Yoshie Institute of PiIysics, University of Tsukuba, Tsukuba, Ibaraki 305, JAPAN Institute of PiIysics, University of Tsukuba, Tsukuba, Ibaraki 305, JAPANView Profile Authors Info & Claims Supercomputing '89: Proceedings of the 1989 ACM/IEEE conference on SupercomputingAugust 1989 Pages 495–504https://doi.org/10.1145/76263.76318Published:01 August 1989Publication History 9citation168DownloadsMetricsTotal Citations9Total Downloads168Last 12 Months4Last 6 weeks1 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my Alerts New Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteeReaderPDF

PACS-32 is a prototype supercomputer used for a broad range of scientific calculations.It has a synchronizable MIMD processor array, and on the basis of this facility, it provides efficient nearest neighbor communication.Processors are combined into a rectangular array with endaround connections, and can synchronize at user-specified points with little overhead.The hardware has been constructed with 32 processors, and the operating software includes a highlevel language.The PACS-32 system has performed in a number of applications, such as Poisson equation solving, nuclear reactor calculation, aerodynamics, Monte Carlo simulation of plasma particles, and molecular dynamics modeling in solid state physics.The processor efficiency measure ranges from 78 percent through 99 percent in these applications.