A flux-driven Josephson parametric amplifier for sub-GHz frequencies fabricated with side-wall passivated spacer junction technology
Research output: Contribution to journal › Article
- VTT Technical Research Centre of Finland
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.
|Journal||Superconductor Science and Technology|
|Publication status||Published - 24 Aug 2018|
|MoE publication type||A1 Journal article-refereed|
- Josephson junction, parametric amplifier, SQUID array