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A general characterization method for nonlinearities in superconducting circuits
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.ORCID iD: 0000-0001-8199-5510
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.ORCID iD: 0000-0003-0675-974X
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2019 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 21, article id 053018Article in journal (Refereed) Published
Abstract [en]

Detailed knowledge of nonlinearity in superconducting microwave circuits is required for the optimal control of their quantum state. We present a general method to precisely characterize this nonlinearity to very high order. Our method is based on intermodulation spectroscopy at microwave frequencies and does not require DC-connection or DC-measurement of an on-chip reference structure. We give a theoretical derivation of the method and we validate it by reconstructing a known nonlinearity from simulated data. We experimentally demonstrate the reconstruction of the unknown nonlinear current-phase relation of a microwave resonator with superconducting nanowires.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 21, article id 053018
Keywords [en]
intermodulation, superconducting circuits, nonlinearity, current-phase relation, parametric amplifier
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-252610DOI: 10.1088/1367-2630/ab175aISI: 000467473500009Scopus ID: 2-s2.0-85069534944OAI: oai:DiVA.org:kth-252610DiVA, id: diva2:1319680
Note

QC 20190603

Available from: 2019-06-03 Created: 2019-06-03 Last updated: 2019-10-04Bibliographically approved

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Weissl, ThomasJolin, Shan WilliamsBorgani, RiccardoForchheimer, DanielHaviland, David B.

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