Many-body post-processing of density functional calculations using the variational quantum eigensolver for Bader charge analysis

• URL: http://arxiv.org/abs/2510.12887v1
• Date: Tue, 14 Oct 2025 18:01:40 GMT
• Title: Many-body post-processing of density functional calculations using the variational quantum eigensolver for Bader charge analysis
• Authors: Erik Schultheis, Alexander Rehn, Gabriel Breuil,
• Abstract summary: We calculate Bader charges for various periodic systems by solving many-body Hamiltonians using the variational quantum eigensolver.<n>We show that our approach, compared to standard DFT, significantly improves the Bader charge values for strongly correlated transition metal oxides.
• Score: 46.861597963256095
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum chemistry and condensed matter physics are among the most promising applications of quantum computers. Further, estimating properties of a material is crucial to evaluate its industrial applications. To investigate charge distributions of weakly and strongly correlated systems we calculate Bader charges for various periodic systems by solving many-body Hamiltonians using the variational quantum eigensolver. The Hamiltonians are computed from Kohn-Sham orbitals obtained from a prior DFT calculation. We first demonstrate the accuracy of our method on various doped MgH2 supercells. Further, we show that our approach, compared to standard DFT, significantly improves the Bader charge values for strongly correlated transition metal oxides, where we take DFT+U results as a reference. The computational framework behind our many-body calculations, called Dopyqo, is made openly available as a software package.

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