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Tunable Nb Superconducting Resonator Based on a Constriction Nano- SQUID Fabricated with a Ne Focused Ion Beam

Kennedy, OW; Burnett, J; Fenton, JC; Constantino, NGN; Warburton, PA; Morton, JJL; Dupont-Ferrier, E; (2019) Tunable Nb Superconducting Resonator Based on a Constriction Nano- SQUID Fabricated with a Ne Focused Ion Beam. Physical Review Applied , 11 , Article 014006. 10.1103/PhysRevApplied.11.014006. Green open access

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Abstract

Hybrid superconducting-spin systems offer the potential to combine highly coherent atomic quantum systems with the scalability of superconducting circuits. To fully exploit this potential requires a high-quality-factor microwave resonator, tunable in frequency and able to operate at magnetic fields optimal for the spin system. Such magnetic fields typically rule out conventional Al -based Josephson-junction devices that have previously been used for tunable high- Q microwave resonators. The larger critical field of Nb allows microwave resonators with large field resilience to be fabricated. Here we demonstrate how constriction-type weak links, patterned in parallel into the central conductor of a Nb coplanar resonator with a neon focused ion beam, can be used to implement a frequency-tunable resonator. We study transmission through two such devices and show how they realize high-quality-factor, tunable, field-resilient devices that hold promise for future applications coupling to spin systems

Type: Article
Title: Tunable Nb Superconducting Resonator Based on a Constriction Nano- SQUID Fabricated with a Ne Focused Ion Beam
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevApplied.11.014006
Publisher version: https://doi.org/10.1103/PhysRevApplied.11.014006
Language: English
Additional information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/). Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10067203
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