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Combinatorial summation of Feynman diagrams

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  • Evgeny Kozik

    (King’s College London)

Abstract

Feynman’s diagrammatic series is a common language for a formally exact theoretical description of systems of infinitely-many interacting quantum particles, as well as a foundation for precision computational techniques. Here we introduce a universal framework for efficient summation of connected or skeleton Feynman diagrams for generic quantum many-body systems. It is based on an explicit combinatorial construction of the sum of the integrands by dynamic programming, at a computational cost that can be made only exponential in the diagram order on a classical computer and potentially polynomial on a quantum computer. We illustrate the technique by an unbiased diagrammatic Monte Carlo calculation of the equation of state of the 2D SU(N) Hubbard model in an experimentally relevant regime, which has remained challenging for state-of-the-art numerical methods.

Suggested Citation

  • Evgeny Kozik, 2024. "Combinatorial summation of Feynman diagrams," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52000-6
    DOI: 10.1038/s41467-024-52000-6
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    References listed on IDEAS

    as
    1. Kun Chen & Kristjan Haule, 2019. "A combined variational and diagrammatic quantum Monte Carlo approach to the many-electron problem," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    2. K. Temme & T. J. Osborne & K. G. Vollbrecht & D. Poulin & F. Verstraete, 2011. "Quantum Metropolis sampling," Nature, Nature, vol. 471(7336), pages 87-90, March.
    3. Andrew J. Daley & Immanuel Bloch & Christian Kokail & Stuart Flannigan & Natalie Pearson & Matthias Troyer & Peter Zoller, 2022. "Practical quantum advantage in quantum simulation," Nature, Nature, vol. 607(7920), pages 667-676, July.
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