Magnetic field resilient high kinetic inductance superconducting niobiumnitride coplanar waveguide resonators

Yu, C'ecile Xinqing; Zihlmann, Simon; Fern'andez-Bada, Gonzalo Troncoso; Thomassin, Jean-Luc; Gustavo, Fr'ed'eric; Dumur, 'Etienne; Maurand, Romain

We characterize niobium nitride $\lambda/2$ coplanar waveguide resonators, which were fabricated from a 10nm thick film on silicon dioxide grown by sputter deposition. For films grown at 120{\deg}C we report a superconducting critical temperature of 7.4K associated with a normal square resistance of 1k$\Omega$ leading to a kinetic inductance of 192pH/$\Box$. We fabricated resonators with a characteristic impedance up to 4.1k$\Omega$ and internal quality factors $Q_\mathrm{i}>10^4$ in the single photon regime at zero magnetic field. Moreover, in the many photons regime, the resonators present high magnetic field resilience with $Q_\mathrm{i}>10^4$ in a 6T in-plane magnetic field as well as in a 300mT out-of-plane magnetic field. These findings make such resonators a compelling choice for cQED experiments involving quantum systems with small electric dipole moments operated in finite magnetic fields.