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Coupled-Cluster Theory for ground- and excited eigenstates
Автор: Gemini Center on Quantum Technology
Загружено: 2023-02-01
Просмотров: 2132
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Speaker: Andre Laestadius, OsloMet
Abstract: In the single-reference coupled-cluster theory, by means of the exponential ansatz, the Schrödinger equation is reformulated into a polynomial system (system of nonlinear equations). The unknowns are the cluster amplitudes that may correspond to ground- or excited eigenstates of the Schrödinger operator. In addition, the coupled-cluster approach has many different variants, such as the extended- and tailored coupled-cluster method. Our results include establishing existence and error estimates of approximate solutions and highlighting some of the numerically observed behavior.
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