For a Fistful of Qubits: Computational Quantum Chemistry on Near-Term Quantum Computers
Doctoral thesis, 2023
This thesis dives into the topic of near-term quantum computing using variational quantum algorithms, the VQE in particular. Leveraging both classical simulations as well existing quantum computers, challenges of near-term quantum computing are explored. A parameter transfer approach is tested, aimed at helping speedup optimization variational parameters; an error mitigation strategy requiring close to no overhead is developed to reduce errors; and to help gauge the quality of quantum calculations beyond the point of quantum advantage, topologies of electron densities are analyzed. In addition, the application of near-term quantum computers to non-Born--Oppenheimer problems is explored, both for static and dynamic cases. The extension to the non-Born--Oppenheimer, opens for new qubit reduction schemes which are analyzed.
Exploration the limits of near-term quantum hardware and algorithms forms a common thread among the topics investigated. While quantum advantage still remains out of grasp for current generations of quantum computers, hope for near-term advantage remains. By pushing the boundaries, useful quantum computing might come one step closer.
quantum computation
nonadiabatic processes
computational chemistry
variational quantum algorithms
quantum error mitigation
Author
Mårten Skogh
Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry
A quantum computing implementation of nuclearelectronic orbital (NEO) theory: Toward an exact pre-Born-Oppenheimer formulation of molecular quantum systems
Journal of Chemical Physics,;Vol. 158(2023)
Journal article
Reference-State Error Mitigation: A Strategy for High Accuracy Quantum Computation of Chemistry
Journal of Chemical Theory and Computation,;Vol. 19(2023)p. 783-789
Journal article
Nonadiabatic Nuclear-Electron Dynamics: A Quantum Computing Approach
Journal of Physical Chemistry Letters,;Vol. 14(2023)p. 7065-7072
Journal article
Accelerating variational quantum eigensolver convergence using parameter transfer
Electronic Structure,;Vol. 5(2023)
Journal article
Mårten Skogh, Phalgun Lolur, Werner Dobrautz, Christopher Warren, Janka Biznárová, Amr Osman, Giovanna Tancredi, Göran Wendin, Jonas Bylander, Martin Rahm. The Electron Density: A Fidelity Witness for Quantum Computation
This thesis explores new applications and methods to help explore and expand the capabilities of near-term quantum computing. Through computational simulations and real-world quantum computation algorithms for ground state energies, electron densities, and time evolution are explored. In addition to algorithms, approaches to speedup convergence are explored, alongside methods for low-cost error mitigation.
Wallenberg Centre for Quantum Technology (WACQT)
Knut and Alice Wallenberg Foundation (KAW 2017.0449, KAW2021.0009, KAW2022.0006), 2018-01-01 -- 2030-03-31.
Infrastructure
C3SE (Chalmers Centre for Computational Science and Engineering)
Subject Categories
Theoretical Chemistry
ISBN
978-91-7905-951-4
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 5417
Publisher
Chalmers
KA-salen, Kemigården 4
Opponent: Gemma C. Solomon