Subspace-Search Quantum Imaginary Time Evolution for Excited State Computations

C Cianci, LF Santos, VS Batista - Journal of Chemical Theory and …, 2024 - ACS Publications
Quantum systems in excited states are attracting significant interest with the advent of noisy
intermediate-scale quantum (NISQ) devices. While ground states of small molecular systems …

A circuit-generated quantum subspace algorithm for the variational quantum eigensolver

MR Hirsbrunner, JW Mullinax, Y Shen… - The Journal of …, 2024 - pubs.aip.org
Recent research has shown that wavefunction evolution in real and imaginary time can
generate quantum subspaces with significant utility for obtaining accurate ground state …

Systematic input scheme for many-boson Hamiltonians with applications to the two-dimensional theory

W Du, JP Vary - Physical Review D, 2025 - APS
We develop a novel, systematic input scheme for many-boson Hamiltonians in order to solve
field theory problems within the light-front Hamiltonian formalism via quantum computing …

A Quantum Eigenvalue Solver Based on Tensor Networks

O Leimkuhler, KB Whaley - arxiv preprint arxiv:2404.10223, 2024 - arxiv.org
We introduce a hybrid quantum-classical eigenvalue solver that constructs a wavefunction
ansatz from a linear combination of matrix product states in rotated orbital bases, enabling …

Diagnosing local minima and accelerating convergence of variational quantum eigensolvers with quantum subspace techniques

MR Hirsbrunner, JW Mullinax, Y Shen… - arxiv preprint arxiv …, 2024 - arxiv.org
Recent research has shown that wavefunction evolution in real-and imaginary-time can
generate quantum subspaces with significant utility for obtaining accurate ground state …

Cheaper and more noise-resilient quantum state preparation using eigenvector continuation

AA Agrawal, A Francis, AF Kemper - arxiv preprint arxiv:2406.17037, 2024 - arxiv.org
Subspace methods are powerful, noise-resilient methods that can effectively prepare ground
states on quantum computers. The challenge is to get a subspace with a small condition …

Quantum subspace expansion approach for simulating dynamical response functions of Kitaev spin liquids

C Umeano, F Jamet, LP Lindoy, I Rungger… - arxiv preprint arxiv …, 2024 - arxiv.org
We develop a quantum simulation-based approach for studying properties of strongly
correlated magnetic materials at increasing scale. We consider a paradigmatic example of a …