Subspace methods for the simulation of molecular response properties on a quantum computer

Peter Reinholdt, Erik Rosendahl Kjellgren*, Juliane Holst Fuglsbjerg, Karl Michael Ziems, Sonia Coriani, Stephan P. A. Sauer, Jacob Kongsted

*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

3 Citationer (Scopus)
18 Downloads (Pure)

Abstract

We explore Davidson methods for obtaining excitation energies and other linear response properties within quantum self-consistent linear response (q-sc-LR) theory. Davidson-type methods allow for obtaining only a few selected excitation energies without explicitly constructing the electronic Hessian since they only require the ability to perform Hessian-vector multiplications. We apply the Davidson method to calculate the excitation energies of hydrogen chains (up to H10) and analyze aspects of statistical noise for computing excitation energies on quantum simulators. Additionally, we apply Davidson methods for computing linear response properties such as static polarizabilities for H2, LiH, H2O, OH−, and NH3, and show that unitary coupled cluster outperforms classical projected coupled cluster for molecular systems with strong correlation. Finally, we formulate the Davidson method for damped (complex) linear response, with application to the nitrogen K-edge X-ray absorption of ammonia, and the C6 coefficients of H2, LiH, H2O, OH−, and NH3.
OriginalsprogEngelsk
TidsskriftJournal of Chemical Theory and Computation
Vol/bind20
Udgave nummer9
Sider (fra-til)3729-3740
Antal sider12
ISSN1549-9618
DOI
StatusUdgivet - 1 maj 2024

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  • Det Natur- og Biovidenskabelige Fakultet

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