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

3 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

Keywords

  • Josephson junction
  • parametric amplifier
  • SQUID array

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