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Experimental Studies in Superconducting Quantum Circuits
KTH, School of Engineering Sciences (SCI).
2026 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

We study the temperature-dependent microwave response of high-kinetic-inductance superconducting resonators fabricated in Albanova's Nanolab as a part of the LKIPA device project. The investigated devices are based on circuit layouts designed for kinetic-inductance parametric amplification but are characterized using single-tone microwave measurements. We first compare the resonance parameters of different circuit designs to discuss and evaluate the performance of some fabricated resonators. A selected device is then measured in a cryostat, between 1.7 K and 3.0 K, to investigate how the resonance frequency, internal and external loss rates, and Kerr nonlinearity depend on temperature. The results show that the temperature dependence of the resonance frequency and external loss rate can be well described using a Mattis-Bardeen approach for linear responses in the investigated temperature interval. The internal loss rate, however, requires additional resistive channels beyond quasiparticle losses. By investigating near-resonance nonlinearities, we also demonstrate that nonlinear effects are less prominent when the temperature is increased. Deviations between the scattering fit and measured data are also discussed to evaluate possible limitations of the scattering model.

Place, publisher, year, edition, pages
2026.
Series
TRITA-SCI-GRU ; 2026:242
Keywords [en]
Superconducting microwave resonators; kinetic inductance; microwave reflections; Mattis-Bardeen theory; Kerr nonlinearity; NbTiN nanowires; thin-film superconductor; superconductivity; cryogenic
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-384445OAI: oai:DiVA.org:kth-384445DiVA, id: diva2:2082537
Subject / course
Applied Physics
Educational program
Master of Science in Engineering -Engineering Physics
Supervisors
Examiners
Available from: 2026-07-01 Created: 2026-07-01 Last updated: 2026-07-01Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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