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Embedding NbN Nanowires Into Quantum Circuits With a Neon Focused Ion Beam

Burnett, J; Sagar, J; Warburton, PA; Fenton, JC; (2016) Embedding NbN Nanowires Into Quantum Circuits With a Neon Focused Ion Beam. IEEE Transactions on Applied Superconductivity , 26 (3) , Article 1700104. 10.1109/TASC.2016.2525988. Green open access

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Abstract

Parasitic two-level systems are generally present in superconducting circuits as a result of conventional fabrication and processing, and these lead to noise and loss of coherence in quantum systems. We examine the use of a Ne focused ion beam for producing nanowires integrated into superconducting circuits with a minimized density of parasitic two-level systems. We report measurements of nanowires produced by Ne focused-ion-beam milling in NbN resonators. The resonator losses increase after the nanowire is fabricated, with the Q factor decreasing by ~30% to ~10 5, which is a factor 10-100 higher than in the most closely comparable circuits previously measured. This indicates that the Ne focused ion beam is a promising route for creating superconducting-nanowire-based devices with low levels of decoherence.

Type: Article
Title: Embedding NbN Nanowires Into Quantum Circuits With a Neon Focused Ion Beam
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TASC.2016.2525988
Publisher version: http://dx.doi.org/10.1109/TASC.2016.2525988
Language: English
Additional information: Copyright © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Keywords: Superconducting microwave device, superconducting thin films, dielectric loss, ion beams
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/1476148
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