Parametrization and optimizability of pulse-level variational quantum eigensolvers

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dc.contributor.authorSherbert, Kyle M.en
dc.contributor.authorAmer, Hishamen
dc.contributor.authorEconomou, Sophia E.en
dc.contributor.authorBarnes, Edwinen
dc.contributor.authorMayhall, Nicholas J.en
dc.date.accessioned2025-02-18T13:32:16Zen
dc.date.available2025-02-18T13:32:16Zen
dc.date.issued2025-02-14en
dc.description.abstractIn conventional variational quantum eigensolvers (VQEs), trial states are prepared by applying series of parameterized gates to a reference state, with the gate parameters being varied to minimize the energy of the target system. Recognizing that the gates are intermediates which are ultimately compiled into a set of control pulses to be applied to each qubit in the lab, the recently proposed ctrl-VQE algorithm takes the amplitudes, frequencies, and phases of the pulse as the variational parameters used to minimize the molecular energy. In this work, we explore how all three degrees of freedom interrelate with one another. To this end, we consider several distinct strategies to parameterize the control pulses, assessing each one through numerical simulations of a transmonlike device. For each parameterization, we contrast the pulse duration required to prepare a good ansatz, and the difficulty to optimize that ansatz from a well-defined initial state. We deduce several guiding heuristics to implement practical ctrl-VQE in hardware, which we anticipate will generalize for generic device architectures.en
dc.description.versionSubmitted versionen
dc.format.mimetypeapplication/pdfen
dc.identifier024036 (Article number)en
dc.identifier.doihttps://doi.org/10.1103/physrevapplied.23.024036en
dc.identifier.eissn2331-7019en
dc.identifier.issue2en
dc.identifier.orcidMayhall, Nicholas [0000-0002-1312-9781]en
dc.identifier.urihttps://hdl.handle.net/10919/124644en
dc.identifier.volume23en
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.titleParametrization and optimizability of pulse-level variational quantum eigensolversen
dc.title.serialPhysical Review Applieden
dc.typeArticleen
dc.type.dcmitypeTexten
dcterms.dateAccepted2025-01-24en
pubs.organisational-groupVirginia Techen
pubs.organisational-groupVirginia Tech/Scienceen
pubs.organisational-groupVirginia Tech/Science/Chemistryen
pubs.organisational-groupVirginia Tech/Science/Physicsen
pubs.organisational-groupVirginia Tech/All T&R Facultyen
pubs.organisational-groupVirginia Tech/Science/COS T&R Facultyen

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