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Quantum inverse iteration algorithm for programmable quantum simulators
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Exeter, UK; ITMO University, Russia.
Number of Authors: 12020 (English)In: npj Quantum Information, E-ISSN 2056-6387, Vol. 6, no 1, article id 7Article in journal (Refereed) Published
Abstract [en]

We propose a quantum inverse iteration algorithm, which can be used to estimate ground state properties of a programmable quantum device. The method relies on the inverse power iteration technique, where the sequential application of the Hamiltonian inverse to an initial state prepares the approximate ground state. To apply the inverse Hamiltonian operation, we write it as a sum of unitary evolution operators using the Fourier approximation approach. This allows to reformulate the protocol as separate measurements for the overlap of initial and propagated wavefunction. The algorithm thus crucially depends on the ability to run Hamiltonian dynamics with an available quantum device, and can be used for analog quantum simulators. We benchmark the performance using paradigmatic examples of quantum chemistry, corresponding to molecular hydrogen and beryllium hydride. Finally, we show its use for studying the ground state properties of relevant material science models, which can be simulated with existing devices, considering an example of the Bose-Hubbard atomic simulator.

Place, publisher, year, edition, pages
2020. Vol. 6, no 1, article id 7
Keywords [en]
Quantum Science & Technology
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-179625DOI: 10.1038/s41534-019-0239-7ISI: 000510814800001OAI: oai:DiVA.org:su-179625DiVA, id: diva2:1414764
Available from: 2020-03-16 Created: 2020-03-16 Last updated: 2022-03-23Bibliographically approved

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Kyriienko, Oleksandr

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