# SlaKoNet-VQD

Variational quantum band-structure calculations for periodic solids have been limited by the input step: each material needs a second-quantized Hamiltonian built by density-functional theory plus Wannierization or by hand-fitted parameters. SlaKoNet-VQD replaces that step with a pretrained universal Slater-Koster tight-binding model, reproducing all eight silicon bands along the standard high-symmetry path with a mean absolute deviation of 1.78 meV from exact diagonalization of the same Hamiltonian. The same workflow, without retraining, covers Al, Ta, V, Nb and ZrN, and a representative aluminum k-point ground state runs on IBM Quantum hardware with an error of about 0.37 eV.

Variational quantum band-structure calculations for periodic solids have been limited by the input step: each material needs a second-quantized Hamiltonian built by density-functional theory plus Wannierization or by hand-fitted parameters. SlaKoNet-VQD replaces that step with a pretrained universal Slater-Koster tight-binding model, reproducing all eight silicon bands along the standard high-symmetry path with a mean absolute deviation of 1.78 meV from exact diagonalization of the same Hamiltonian. The same workflow, without retraining, covers Al, Ta, V, Nb and ZrN, and a representative aluminum k-point ground state runs on IBM Quantum hardware with an error of about 0.37 eV.