Calibrated cryogenic amplifier measurements

Determining the characteristics of a current pumped nanobridge Josephson Parametric Amplifier using Short-Open-Load and Thermal Calibration

Master thesis (2021)

Authors

L. Locht Applied Sciences

Contributors

G.A. Steele QN/Steele Lab - AS (supervisor 1)
Y.M. Blanter QN/Blanter Group - AS (supervisor 2)
T. van der Sar QN/vanderSarlab - AS (supervisor 2)
A. Bruno (supervisor 2)
W.J.M. Franse QN/Steele Lab - AS (supervisor 2)
Faculty
Applied Sciences
Copyright: © 2021 Lieuwe Locht
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Published Date

22-12-2021

Language

English

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Faculty

Applied Sciences

Abstract

In this project, we have done a calibrated measurement on a previously designed and fabricated current pumped Josephson Parametric amplifier. We have installed a microwave switch into our crygenic fridge tobe able to get a calibrated response measurement using Short-Open-Load calibration, which we used withmeasurements of the gain and flux tunability of the device. This showed that our previous measurements onthe gain deviated significantly, with about 10dB. We also did a thermal calibration on the amplifier by heatingthe plate it was attached to, and found that the input noise approximates the limit of a half quantum of noise.