Issue 10, 2024

Perspective on Coupled-cluster Theory. The evolution toward simplicity in quantum chemistry

Abstract

Coupled-cluster theory has revolutionized quantum chemistry. It has provided the framework to effectively solve the problem of electron correlation, the main focus of the field for over 60 years. This has enabled ab initio quantum chemistry to provide predictive quality results for most quantities of interest that are obtainable from first-principle calculations. The best that one can do in a basis is the ‘full CI,’ the exact solution of the non-relativistic Schrödinger equation or, if need be, the relativistic Dirac equation. With due regard to converging the basis set and adequate consideration of higher clusters and relativity in a calculation, virtually predictive results can be obtained. But in addition to its numerical performance, coupled-cluster theory also offers a conceptually new, many-body foundation for the theory that should be appreciated by all practitioners. The latter is emphasized in this perspective, leading to the ‘evolution toward simplicity’ in the title. The ultimate theory will benefit from the several features that are uniquely exact in coupled-cluster theory and its equation-of-motion (EOM-CC) extensions.

Graphical abstract: Perspective on Coupled-cluster Theory. The evolution toward simplicity in quantum chemistry

Article information

Article type
Perspective
Submitted
11 8 2023
Accepted
05 12 2023
First published
23 2 2024

Phys. Chem. Chem. Phys., 2024,26, 8013-8037

Perspective on Coupled-cluster Theory. The evolution toward simplicity in quantum chemistry

R. J. Bartlett, Phys. Chem. Chem. Phys., 2024, 26, 8013 DOI: 10.1039/D3CP03853J

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