Tunable microwave impedance matching to a high impedance source using a Josephson metamaterial

We report the efficient coupling of a \(50\,\Omega\) microwave circuit to a high impedance conductor. We use an impedance transformer consisting of a \(\lambda/4\) co-planar resonator whose inner conductor contains an array of superconducting quantum interference devices (SQUIDs), providing the reso...

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Bibliographic Details
Published in:arXiv.org 2014-04
Main Authors: Altimiras, Carles, Parlavecchio, Olivier, Joyez, Philippe, Vion, Denis, Roche, Patrice, Esteve, Daniel, Portier, Fabien
Format: Article
Language:English
Subjects:
Conductors
High impedance
High resistance
Impedance matching
Inductance
Metamaterials
Microwave circuits
Noise measurement
Resonant frequencies
Resonators
Shot noise
Superconducting quantum interference devices
Tunnel junctions
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Summary:We report the efficient coupling of a \(50\,\Omega\) microwave circuit to a high impedance conductor. We use an impedance transformer consisting of a \(\lambda/4\) co-planar resonator whose inner conductor contains an array of superconducting quantum interference devices (SQUIDs), providing the resonator with a large and tunable lineic inductance \(\mathcal{L}\sim 80 \mu_0\), resulting in a large characteristic impedance \(Z_C\sim 1\,\mathrm{k}\Omega\). The impedance matching efficiency is characterized by measuring the shot noise power emitted by a dc biased high resistance tunnel junction connected to the resonator. We demonstrate matching to impedances in the \(15\) to \(35\,\mathrm{k}\Omega\) range with bandwidths above \(100\,\mathrm{MHz}\) around a resonant frequency tunable in the \(4\) to \(6\,\mathrm{GHz}\) range.
ISSN:2331-8422
DOI:10.48550/arxiv.1404.1792