Characterizing superconducting filters using residual microwave background

Janne S. Lehtinen (Corresponding Author), Emma Mykkänen, Antti Kemppinen, S. Lotkhov, D. Golubev, Antti Manninen

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)


A normal metal-superconductor hybrid single-electron trap with tunable barrier is utilized as a tool for spectrum analysis at the extremely low signal levels, using only well filtered cryogenic microwave background as a photon source in the frequency range from about 50 to 210 GHz. We probe millimeter wave propagation in two superconducting systems: a Josephson junction array around its plasma frequency, and a superconducting titanium film in the limit when the photon energies are larger than the superconducting energy gap. This regime is relevant for improving the performance of cryogenic quantum devices but is hard to access with conventional techniques. We show that relatively simple models can be used to describe the essential properties of the studied components.
Original languageEnglish
Article number055006
Number of pages10
JournalSuperconductor Science and Technology
Issue number5
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed


  • superconductivity
  • microwave propagation
  • single-electron trap
  • microwave photon
  • detection
  • on-chip filters
  • josephson array


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