Spiers Memorial Lecture: Quantum chemistry, classical heuristics, and quantum advantage

GKL Chan - Faraday Discussions, 2024 - pubs.rsc.org
We describe the problems of quantum chemistry, the intuition behind classical heuristic
methods used to solve them, a conjectured form of the classical complexity of quantum …

The shape of full configuration interaction to come

JJ Eriksen - The Journal of Physical Chemistry Letters, 2020 - ACS Publications
We present a Perspective on what the future holds for full configuration interaction (FCI)
theory, with an emphasis on conceptual rather than technical details. Upon revisiting the …

Conversion of projected entangled pair states into a canonical form

R Haghshenas, MJ O'Rourke, GKL Chan - Physical Review B, 2019 - APS
We propose an algorithm to convert a projected entangled pair state (PEPS) into a canonical
form, analogous to the well-known canonical form of a matrix product state. Our approach is …

Quantum simulation of two-dimensional quantum chemistry in optical lattices

J Argüello-Luengo, A González-Tudela, T Shi… - Physical Review …, 2020 - APS
Benchmarking numerical methods in quantum chemistry is one of the key opportunities that
quantum simulators can offer. Here, we propose an analog simulator for discrete two …

Multisliced gausslet basis sets for electronic structure

SR White, EM Stoudenmire - Physical Review B, 2019 - APS
We introduce highly local basis sets for electronic structure which are very efficient for
correlation calculations near the complete basis set limit. Our approach is based on …

Generating function for tensor network diagrammatic summation

WL Tu, HK Wu, N Schuch, N Kawashima, JY Chen - Physical Review B, 2021 - APS
The understanding of complex quantum many-body systems has been vastly boosted by
tensor network (TN) methods. Among others, excitation spectrum and long-range interacting …

Simplified and improved approach to tensor network operators in two dimensions

MJ O'Rourke, GKL Chan - Physical Review B, 2020 - APS
Matrix product states and matrix product operators (MPOs) are one-dimensional tensor
networks that underlie the modern density matrix renormalization group (DMRG) algorithm …

Generalization of the exponential basis for tensor network representations of long-range interactions in two and three dimensions

Z Li, MJ O'Rourke, GKL Chan - Physical Review B, 2019 - APS
In one dimension (1D), a general decaying long-range interaction can be fit to a sum of
exponential interactions e− λ rij with varying exponents λ, each of which can be represented …

Emergence of gaussianity in the thermodynamic limit of interacting fermions

G Matos, A Hallam, A Deger, Z Papić, JK Pachos - Physical Review B, 2021 - APS
Systems of interacting fermions can give rise to ground states whose correlations become
effectively free-fermion-like in the thermodynamic limit, as shown by Baxter for a class of …

Numerical continuum tensor networks in two dimensions

R Haghshenas, ZH Cui, GKL Chan - Physical Review Research, 2021 - APS
We describe the use of tensor networks to numerically determine wave functions of
interacting two-dimensional fermionic models in the continuum limit. We use two different …