We present superconducting microwave-frequency resonators based on NbTiNnanowires. The small cross section of the nanowires minimizes vortexgeneration, making the resonators resilient to magnetic fields. Measuredintrinsic quality factors exceed $2\times 10^5$ in a $6$ T in-plane magneticfield, and $3\times 10^4$ in a $350$ mT perpendicular magnetic field. Due totheir high characteristic impedance, these resonators are expected to developzero-point voltage fluctuations one order of magnitude larger than in standardcoplanar waveguide resonators. These properties make the nanowire resonatorswell suited for circuit QED experiments needing strong coupling to quantumsystems with small electric dipole moments and requiring a magnetic field, suchas electrons in single and double quantum dots.
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