Article Dans Une Revue The Journal of Chemical Physics Année : 2025

Reproducibility of fixed-node diffusion Monte Carlo across diverse community codes: The case of water–methane dimer

Flaviano Della Pia
  • Fonction : Auteur
Benjamin X. Shi
  • Fonction : Auteur
Yasmine S. Al-Hamdani
  • Fonction : Auteur
Tyler A. Anderson
  • Fonction : Auteur
Matteo Barborini
  • Fonction : Auteur
Neil D. Drummond
  • Fonction : Auteur
Matúš Dubecký
  • Fonction : Auteur
Pablo López Ríos
  • Fonction : Auteur
Manolo C. Per
  • Fonction : Auteur
Jil Schultze
  • Fonction : Auteur
Ravindra Shinde
  • Fonction : Auteur
Emiel Slootman
  • Fonction : Auteur
Sandro Sorella
  • Fonction : Auteur
Alexandre Tkatchenko
  • Fonction : Auteur
Mike Towler
  • Fonction : Auteur
Cyrus J. Umrigar
  • Fonction : Auteur
Lucas K. Wagner
  • Fonction : Auteur
William A. Wheeler
  • Fonction : Auteur
Haihan Zhou
  • Fonction : Auteur
Andrea Zen
  • Fonction : Auteur

Résumé

Fixed-node diffusion quantum Monte Carlo (FN-DMC) is a widely-trusted many-body method for solving the Schr\"{o}dinger equation, known for its reliable predictions of material and molecular properties. Furthermore, its excellent scalability with system complexity and near-perfect utilization of computational power makes FN-DMC ideally positioned to leverage new advances in computing to address increasingly complex scientific problems. Even though the method is widely used as a computational gold standard, reproducibility across the numerous FN-DMC code implementations has yet to be demonstrated. This difficulty stems from the diverse array of DMC algorithms and trial wave functions, compounded by the method's inherent stochastic nature. This study represents a community-wide effort to address the titular question, affirming that: Yes, FN-DMC is reproducible (when handled with care). Using the water-methane dimer as the canonical test case, we compare results from eleven different FN-DMC codes and show that the approximations to treat the non-locality of pseudopotentials are the primary source of the discrepancies between them. In particular, we demonstrate that, for the same choice of determinantal component in the trial wave function, reliable and reproducible predictions can be achieved by employing the T-move (TM), the determinant locality approximation (DLA), or the determinant T-move (DTM) schemes, while the older locality approximation (LA) leads to considerable variability in results. This work lays the foundation to establish accurate and reproducible FN-DMC estimates for all future studies across applications in materials science, physics, chemistry, and biology.

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hal-05039409 , version 1 (18-04-2025)

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Flaviano Della Pia, Benjamin X. Shi, Yasmine S. Al-Hamdani, Dario Alfè, Tyler A. Anderson, et al.. Reproducibility of fixed-node diffusion Monte Carlo across diverse community codes: The case of water–methane dimer. The Journal of Chemical Physics, 2025, 163, pp.104110. ⟨10.1063/5.0272974⟩. ⟨hal-05039409⟩
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