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

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 sid...

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Bibliographic Details
Published inSuperconductor science & technology Vol. 31; no. 10; pp. 105001 - 105007
Main Authors Simbierowicz, Slawomir, Vesterinen, Visa, Grönberg, Leif, Lehtinen, Janne, Prunnila, Mika, Hassel, Juha
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.10.2018
Subjects
Josephson junction
parametric amplifier
SQUID array
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Summary: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.
Bibliography:SUST-102825.R1
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/aad4f2