Which Options Exist for NISQ-Friendly Linear Response Formulations?

Linear response (LR) theory is a powerful tool in classic quantum chemistry crucial to understanding photoinduced processes in chemistry and biology. However, performing simulations for large systems and in the case of strong electron correlation remains challenging. Quantum computers are poised to...

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Bibliographic Details
Published in:Journal of chemical theory and computation 2024-05, Vol.20 (9), p.3551-3565
Main Authors: Ziems, Karl Michael, Kjellgren, Erik Rosendahl, Reinholdt, Peter, Jensen, Phillip W. K., Sauer, Stephan P. A., Kongsted, Jacob, Coriani, Sonia
Format: Article
Language:English
Subjects:
Absorption spectra
Potential energy
Quantum chemistry
Quantum computers
Quantum Electronic Structure
Self consistent fields
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Summary:Linear response (LR) theory is a powerful tool in classic quantum chemistry crucial to understanding photoinduced processes in chemistry and biology. However, performing simulations for large systems and in the case of strong electron correlation remains challenging. Quantum computers are poised to facilitate the simulation of such systems, and recently, a quantum linear response formulation (qLR) was introduced [Kumar et al., J. Chem. Theory Comput. 2023, 19, 9136–9150]. To apply qLR to near-term quantum computers beyond a minimal basis set, we here introduce a resource-efficient qLR theory, using a truncated active-space version of the multiconfigurational self-consistent field LR ansatz. Therein, we investigate eight different near-term qLR formalisms that utilize novel operator transformations that allow the qLR equations to be performed on near-term hardware. Simulating excited state potential energy curves and absorption spectra for various test cases, we identify two promising candidates, dubbed “proj LRSD” and “all-proj LRSD”.
ISSN:1549-9618
1549-9626
DOI:10.1021/acs.jctc.3c01402