Optimizing VQE Ansatz for Studying Tight-Binding Models with \textit{sd}-Interaction and On-Site Coulomb Repulsion

Oleg Udalov

Optimizing VQE Ansatz for Studying Tight-Binding Models with \textit{sd}-Interaction and On-Site Coulomb Repulsion

Quantum Physics 2025-10-13 v1 Strongly Correlated Electrons

Authors: Oleg Udalov

Abstract

The VQE algorithm is applied to the problem of finding the ground state of a lattice model with on-site Coulomb repulsion, nearest-neighbor hopping, and on-site sd-interaction. We compare the performance of several ansatze, including cluster and generic forms. Several modifications of the standard cluster ansatz implementation are proposed, which significantly reduce the number of two-qubit gates. Different classical optimizers are employed within the VQE algorithm. The performance of the algorithms is evaluated using both noiseless and noisy simulations.

Keywords

variational quantum eigensolver computational physics computational optimization

Cite

@article{arxiv.2510.08864,
  title  = {Optimizing VQE Ansatz for Studying Tight-Binding Models with \textit{sd}-Interaction and On-Site Coulomb Repulsion},
  author = {Oleg Udalov},
  journal= {arXiv preprint arXiv:2510.08864},
  year   = {2025}
}

Comments

17 pages, 3 figures, 5 tables

Related papers

View all related →