Chapman, Gemma;
Godfrey, Tom;
Potter, Jamie;
Meti, Laith;
Bhandari, Parth;
Romans, Ed;
Gallop, John;
(2025)
Realization of a Monolithic, Planar SLUG Amplifier for the Quantum Electronics Toolbox.
IEEE Transactions on Applied Superconductivity
, 35
(5)
, Article 1600805. 10.1109/tasc.2025.3549394.
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Abstract
The Superconducting Low-inductance Undulatory Galvanometer (SLUG) amplifier is an ultra-low noise rf amplifier that is simple to operate and can be designed for a wide range of microwave frequencies. A variant of the dc SQUID rf amplifier, the SLUG differs in that the rf signal is directly injected in the SQUID loop, allowing high frequency operation. Here, we realize a planar SLUG amplifier constructed with nanobridge weak-link junctions that is fabricated from a single layer of niobium. Impedance models for the SLUG gain element are presented in conjunction with a discussion of appropriate impedance matching techniques. Experimental characterization of a proof-of-concept SLUG amplifier designed with a single-stub tuning circuit show modulation of the SLUG operation frequency in line with biasing of the SLUG, a well-matched input network and forward gain of 8 dB.
| Type: | Article |
|---|---|
| Title: | Realization of a Monolithic, Planar SLUG Amplifier for the Quantum Electronics Toolbox |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/tasc.2025.3549394 |
| Publisher version: | https://doi.org/10.1109/tasc.2025.3549394 |
| Language: | English |
| Additional information: | Copyright © 2025 The Authors. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/. |
| Keywords: | Coplanar waveguide, focused-ion-beam (FIB), nanobridge Josephson junction, quantum-limited rf amplifier, single-stub tuning, superconducting low-inductance undulatory galvanometer (SLUG) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10206733 |
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