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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.36: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Optimized superconducting NbN resonators for hybrid quantum systems in strong magnetic field — •Thomas Koch¹, Kiril Borisov^1,2, Dennis Rieger¹, Christoph Sürgers¹, Patrick Winkel¹, Ioan Pop^1,2, and Wolfgang Wernsdorfer^1,2 — ¹Physikalisches Institut, Karlsruher Institut für Technologie, Karlsruhe — ²Institute of Nanotechnology, Karlsruher Institut für Technologie, Karlsruhe

Superconductors are utilized as highly precise detectors for magnetometry, superconducting qubits and other hybrid quantum systems. Our goal is superconducting NbN microwave resonators with high magnetic field stability and high quality factors at single photon regime. Therefore, we optimized deposition conditions and patterning geometries and achieved high critical temperature (≈ 15 K), high critical fields (> 9 T), reduced susceptibility to vortex dynamics and high kinetic inductance (L ≈ 80 pH/square) in thin (10 nm) NbN films. We extracted quality factor and resonance frequency of stripline NbN resonators by microwave reflection in parallel and perpendicular field up to 1 T at 20 mK. Initial results on the realization of a hybrid quantum system with a NbN resonator as a read-out sensor will be presented as well.