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Trapped Ion Quantum Computing Superconducting Qubits

Improving magnetic-field resilience of NbTiN planar resonators using a hard-mask fabrication technique

arXiv
Authors: Arne Bahr, Matteo Boselli, Benjamin Huard, Audrey Bienfait

Year

2023

Paper ID

53215

Status

Preprint

Abstract Read

~2 min

Abstract Words

109

Citations

N/A

Abstract

High-quality factor microwave resonators operating in a magnetic field are a necessity for some quantum sensing applications and hybrid platforms. Losses in microwave superconducting resonators can have several origins, including microscopic defects, usually known as two-level-systems (TLS). Here, we characterize the magnetic field response of NbTiN resonators patterned on sapphire and observe clear absorption lines occurring at specific magnetic fields. We identify the spin systems responsible for these features, including a yet unreported spin with g=1.85 that we attribute to defects in the NbTiN thin film. We develop mitigation strategies involving namely an aluminum etch mask, resulting in maintaining quality factors above Q>2 times 105 in the range 0-0.3 T.

Why This Paper Matters

  • This paper contributes to the Superconducting Qubits research area in the Quantum Articles archive.
  • It adds a 2023 reference point for readers tracking recent quantum research.
  • High-quality factor microwave resonators operating in a magnetic field are a necessity for some quantum sensing applications and hybrid platforms.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2312.13703 [2] arXiv https://arxiv.org/abs/2312.13703 [3] Publisher https://arxiv.org/abs/2312.13703

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