Fabrication and characteriation of Josephson parametric amplifiers

Master thesis (2018)

Authors

M.H.J. de Jong Applied Sciences

Contributors

D. Bothner (mentor)
G.A. Steele (mentor)
L. Kuipers (graduation committee member)
A. Endo (graduation committee member)
Faculty
Applied Sciences, Applied Sciences
Copyright: © 2018 Matthijs de Jong
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Published Date

17-10-2018

Language

English

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Faculty

Applied Sciences

Abstract

In this thesis, a we have designed and fabricated a Josephson Parametric Amplifier (JPA) using a new double-angle evaporation method without a Dolan bridge. We have found and resolved several issues in the fabrication procedure, but it requires further tuning before being fully functional. We have also simulated the behaviour of a general parametric amplifier with an additional Duffing non-linear term, and found that this term appears to limit the oscillation amplitude. We have attempted to characterize Josephson junctions fabricated with the new double-angle evaporation procedure, but without much success. Using a different fabrication method, a JPA was made and successfully characterized. The maximum measured gain is 16 dB, with a bandwidth of 1 MHz. The noise temperature is comparable to the cryostat temperature of 250 mK, but it was not characterized accurately.

Files

ThesisMatthijs.pdf
(.pdf | 22.7 Mb)