Romans, Edward;
Meti, Laith;
Potter, Jamie;
Chapman, Gemma;
Gallop, John;
Hao, Ling;
(2025)
Millikelvin Nb nanoSQUID-embedded tunable resonator fabricated with a neon focused-ion-beam.
Applied Physics Letters
, 126
, Article 012601. 10.1063/5.0230505.
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Abstract
SQUID-embedded superconducting resonators are of great interest due to their potential for coupling highly scalable superconducting circuits with quantum memories based on solid-state spin ensembles. Such an application requires a high-Q, frequency-tuneable resonator which is both resilient to magnetic field, and able to operate at millikelvin temperatures. These requirements motivate the use of a higher Hc metal such as niobium, however the challenge then becomes to sufficiently reduce the operating temperature. We address this by presenting a monolithic Nb nanoSQUID-embedded resonator, where neon focused-ion-beam fabrication of the nanoSQUID results in a device displaying frequency tuneability at T = 16 mK. In order to assess the applicability of the device for coupling to small spin clusters, we characterise the flux sensitivity as a function of microwave drive power and externally applied magnetic field, and find that the noise is dominated by dielectric noise in the resonator. Finally, we discuss improvements to the device design which can dramatically improve the flux sensitivity, which highlights the promise of Nb SQUID-embedded resonators for hybrid superconductor-spin applications.
| Type: | Article |
|---|---|
| Title: | Millikelvin Nb nanoSQUID-embedded tunable resonator fabricated with a neon focused-ion-beam |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/5.0230505 |
| Publisher version: | https://doi.org/10.1063/5.0230505 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| 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/10202691 |
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