Tunable Nb Superconducting Resonator Based on a Constriction Nano-SQUID Fabricated with a Ne Focused Ion Beam
Journal article, 2019

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.


O. W. Kennedy

University College London (UCL)

J. Burnett

Chalmers, Microtechnology and Nanoscience (MC2)

J. C. Fenton

University College London (UCL)

N. G. N. Constantino

University College London (UCL)

P. A. Warburton

University College London (UCL)

J. J. L. Morton

University College London (UCL)

E. Dupont-Ferrier

Université de Sherbrooke

University College London (UCL)

Physical Review Applied

2331-7019 (eISSN)

Vol. 11 1 014006

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Condensed Matter Physics



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