Work

Rimu.jl: Random integrators for many-body quantum systems

Year: 2026

Type: preprint

Abstract: Rimu$.$jl is a Julia package for solving many-body quantum problems. The core of the package is a matrix-free implementation of Hamiltonians and other operators and compact representation of Fock states, which together allow for efficient methods suitable for high-performance computing. Rimu$.$jl includes a Julia implementation of the full configuration interaction quantum Monte Carlo (FCIQMC) algorithm which is a type of projector QMC algorithm for stochastically solving the time-independent Schrödinger equation. It also includes many well-known model Hamiltonians, and an interface for exact diagonalisation based on external eigenvalue solvers. Both the stochastic and exact diagonalisation methods are accessed with a CommonSolve$.$jl interface. We describe the FCIQMC algorithm and how to obtain estimators of observables as well as the key features of the implementation.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2601.19505

Authors: Čufar, Matija, Bradly, C. J., Yang, Ray, Pahl, Elke, Brand, Joachim

Institutions: The Dodd-Walls Centre for Photonic and Quantum Technologies, The University of Melbourne, Washington University in St. Louis, MacDiarmid Institute for Advanced Materials and Nanotechnology

Topic: Quantum many-body systems

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, Royal Society Te Apārangi, Office of Science, Marsden Fund

OpenAlex ID: W7125979077

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