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Low-Loss Superconducting Nanowire Circuits Using a Neon Focused Ion Beam

Burnett, J; Sagar, J; Kennedy, OW; Warburton, PA; Fenton, JC; (2017) Low-Loss Superconducting Nanowire Circuits Using a Neon Focused Ion Beam. Physical Review Applied , 8 (1) , Article 014039. 10.1103/PhysRevApplied.8.014039. Green open access

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Abstract

We present low-temperature measurements of low-loss superconducting nanowire-embedded resonators in the low-power limit relevant for quantum circuits. The superconducting resonators are embedded with superconducting nanowires with widths down to 20 nm using a neon focused ion beam. In the low-power limit, we demonstrate an internal quality factor up to 3.9 × 105 at 300 mK [implying a two-level-systemlimited quality factor up to 2 × 105 at 10 mK], not only significantly higher than in similar devices but also matching the state of the art of conventional Josephson-junction-embedded resonators. We also show a high sensitivity of the nanowire to stray infrared photons, which is controllable by suitable precautions to minimize stray photons in the sample environment. Our results suggest that there are excellent prospects for superconducting-nanowire-based quantum circuits.

Type: Article
Title: Low-Loss Superconducting Nanowire Circuits Using a Neon Focused Ion Beam
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevApplied.8.014039
Publisher version: http://doi.org/10.1103/PhysRevApplied.8.014039
Language: English
Additional information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Keywords: Science & Technology, Physical Sciences, Physics, Applied, Physics, 2-LEVEL SYSTEMS
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/1571742
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