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arXiv:1405.5019 · Journal of Low Temperature Physics

Advanced Concepts in Josephson Junction Reflection Amplifiers

Pasi Lähteenmäki, Visa Vesterinen, Juha Hassel, Gheorghe Sorin Paraoanu, Heikki Seppä, Pertti Juhani Hakonen

Published Apr 2, 2014• 17 citations
arXivHTMLPDF
DOI
10.1007/s10909-014-1170-0

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Josephson junction arrays as parametric amplifiers (A)

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A major challenge for the experimental realization of advanced superconducting traveling-wave parametric amplifiers is given by proper impedance matching of the input and output transmission lines and the active region with periodically embedded Josephson junction arrays. For a large impedance mismatch, non-negligible reflections occur at the interfaces, leading to a co-propagation of cavity-like modes. In this contribution, we want to assess the effects of improper impedance matching on the transmission spectrum of traveling-wave parametric amplifiers using a simple overlay cavity model. Our results can serve as a guideline for design limitations of Josephson-junction-embedded transmission lines.
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It has been recently demonstrated that a single Josephson junction with a properly engineered impedance environment can be used as a reflection amplifier approaching the quantum limit at microwave frequencies. In this article the authors describe an improved microwave setup for such a device. Voltage-tunable capacitors enable precise impedance matching across a wide range of operating points. Also, a branch-line coupler instead of a microwave circulator is used for the separation of the input and the output signals to make the system more compact and affordable. Furthermore, a custom-designed bias tee is introduced. The authors present characterization results of individual components as well as of the complete system. In particular, noise spectroscopy is used to study amplifier stability as a function of input matching.