Multimode physics of the unimon circuit

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorTuohino, Sasuen_US
dc.contributor.authorVadimov, Vasiliien_US
dc.contributor.authorTeixeira, Wallaceen_US
dc.contributor.authorMalmelin, Tommien_US
dc.contributor.authorSilveri, Mattien_US
dc.contributor.authorMöttönen, Mikkoen_US
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.groupauthorQuantum Computing and Devicesen
dc.contributor.groupauthorCentre of Excellence in Quantum Technology, QTFen
dc.contributor.groupauthorQuantum Dynamicsen
dc.contributor.organizationQuantum Computing and Devicesen_US
dc.contributor.organizationQuantum Dynamicsen_US
dc.contributor.organizationUniversity of Ouluen_US
dc.date.accessioned2024-08-06T07:43:39Z
dc.date.available2024-08-06T07:43:39Z
dc.date.issued2024-07-01en_US
dc.descriptionPublisher Copyright: © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. | openaire: EC/H2020/101053801/EU//ConceptQ
dc.description.abstractWe consider a superconducting half-wavelength resonator that is grounded at its both ends and contains a single Josephson junction. Previously this circuit was considered as a unimon qubit in the single-mode approximation where dc-phase-biasing the junction to π leads to increased anharmonicity and 99.9% experimentally observed single-qubit gate fidelity. Inspired by the promising first experimental results, we develop here a theoretical and numerical model for the detailed understanding of the multimode physics of the unimon circuit. To this end, first, we consider the high-frequency modes of the unimon circuit and find that even though these modes are at their ground state, they imply a significant renormalization to the Josephson energy. We introduce an efficient method to fully account for the relevant modes and show that unexcited high-lying modes lead to corrections in the qubit energy and anharmonicity. Interestingly, provided that the junction is offset from the middle of the circuit, we find strong cross-Kerr coupling strengths between a few low-lying modes. This observation paves the way for the utilization of the multimode structure, for example, as several qubits embedded into a single unimon circuit.en
dc.description.versionPeer revieweden
dc.format.extent21
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationTuohino, S, Vadimov, V, Teixeira, W, Malmelin, T, Silveri, M & Möttönen, M 2024, ' Multimode physics of the unimon circuit ', PHYSICAL REVIEW RESEARCH, vol. 6, no. 3, 033001, pp. 1-21 . https://doi.org/10.1103/PhysRevResearch.6.033001en
dc.identifier.doi10.1103/PhysRevResearch.6.033001en_US
dc.identifier.issn2643-1564
dc.identifier.otherPURE UUID: 5b8e5aa9-a28a-4474-a62c-7e687983de48en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/5b8e5aa9-a28a-4474-a62c-7e687983de48en_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85197572129&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/151510506/Multimode_physics_of_the_unimon_circuit.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/129668
dc.identifier.urnURN:NBN:fi:aalto-202408065241
dc.language.isoenen
dc.publisherAmerican Physical Society
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/101053801/EU//ConceptQen_US
dc.relation.ispartofseriesPHYSICAL REVIEW RESEARCH
dc.relation.ispartofseriesVolume 6, issue 3, pp. 1-21
dc.rightsopenAccessen
dc.titleMultimode physics of the unimon circuiten
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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