Efficient Auxiliary-Field Quantum Monte Carlo using Isometric Tensor Hypercontraction

TL;DR

This paper introduces a novel AFQMC method utilizing isometric tensor hypercontraction to improve computational efficiency and accuracy in electronic structure calculations, demonstrated on molecular systems.

Contribution

The paper presents an innovative AFQMC approach that reduces complexity and enhances performance using ITHC, enabling high-accuracy results with better scaling.

Findings

Accurately computed ground-state energies of H10 chain and benzene.

Achieved correlation recovery comparable to CC and DMRG methods.

Demonstrated improved practical performance over standard AFQMC.

Abstract

Auxiliary Field Quantum Monte Carlo (AFQMC) has emerged as a powerful framework for treating strongly correlated electronic systems, offering a favorable balance between computational cost and accuracy. In this paper, we present a novel AFQMC method that uses the isometric tensor hypercontraction (ITHC) technique to diagonalize the two-body Coulomb interaction of molecular electronic Hamiltonians by introducing additional fictitious fermionic modes. Our method shows reduced theoretical complexity and better practical performance for both propagation and local energy evaluation compared to the standard AFQMC method. We demonstrate the efficacy of this approach by computing the ground-state energies of a linear $\ce{H10}$-chain and the benzene molecule. Our results show that the extended-basis AFQMC recovers many-body correlations with a precision comparable to that of high-level wavefunction methods such as Coupled Clusters (CC) or Density Matrix Renormalization Group (DMRG), while offering significantly improved scaling.