A flux-driven Josephson parametric amplifier for sub-GHz frequencies fabricated with side-wall passivated spacer junction technology

Slawomir Simbierowicz (Corresponding Author), Visa Vesterinen, Leif Grönberg, Janne Lehtinen, Mika Prunnila, Juha Hassel

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

We present experimental results for a Josephson parametric amplifier tailored for readout of ultra-sensitive thermal microwave detectors. In particular, we discuss the impact of fabrication details on the performance. We show that the small volume of deposited dielectric materials enabled by the side-wall passivated spacer niobium junction technology leads to robust operation across a wide range of operating temperatures up to 1.5 K. The flux-pumped amplifier has gain in excess of 20 dB in three-wave mixing and its center frequency is tunable between 540-640 MHz. At 600 MHz, the amplifier adds 105 mK 9 mK of noise, as determined with the hot/cold source method. Phase-sensitive amplification is demonstrated with the device.
Original languageEnglish
Article number105001
JournalSuperconductor Science and Technology
Volume31
Issue number10
DOIs
Publication statusPublished - 24 Aug 2018
MoE publication typeA1 Journal article-refereed

Funding

This work was performed as part of the Academy of Finland Centre of Excellence program (projects 312294, 284594, 312059, 251748, and 284621). The work also received funding from the Academy of Finland project QuMOS (project numbers 288907 and 287768), Future Makers Funding Program by Technology Industries of Finland Centennial Foundation and Jane and Aatos Erkko Foundation.

Keywords

  • Josephson junction
  • parametric amplifier
  • SQUID array

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