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Publication Detail
Embedding NbN nanowires into quantum circuits with a neon focused ion beam
  • Publication Type:
    Journal article
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  • Authors:
    Burnett JJ, Sagar J, Warburton P, Fenton J
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  • Journal:
    IEEE Transactions on Applied Superconductivity
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  • Keywords:
    Two level system, superconducting resonator, superconducting nanowire, focused ion beam
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 minimised 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.
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