SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Focus Session: Disordered and Granular Superconductors: Fundamentals and Applications in Quantum Technology II
TT 7.7: Vortrag
Dienstag, 28. September 2021, 15:45–16:00, H6
High-kinetic-inductance superconducting nanowires for ultra-compact microwave devices — •Marco Colangelo1, Daniel F. Santavicca2, Carleigh R. Eagle2, Brenden A. Butters1, Owen Medeiros1, Maitri P. Warusawithana2, and Karl K. Berggren1 — 1Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA — 2University of North Florida, Department of Physics, 1 UNF Dr, Jacksonville, FL 32224
Superconducting nanowires made of disordered thin films can achieve a kinetic inductance which is several orders of magnitude higher than their magnetic inductance. Nanowires, integrated into transmission-line architectures, feature a characteristic impedance ~kΩ, an effective phase velocity a few percent of the speed of light in vacuum, and a strong compression of the microwave wavelength. We exploit these properties to demonstrate a balanced forward coupler at 4.73GHz based on coupled nanowire stripline with < 500 μm2 footprint, more than one order of magnitude lower than traditional modules. Interfacing high-impedance nanowire devices to 50 Ω electronics requires a large matching structure, which can, in principle, spoil the miniaturization achieved with nanowires. We address this challenge by combining high-inductance nanowires with high dielectric constant substrates. We demonstrate nanoscale resonators operating natively at 50Ω featuring a wavelength compression of almost 200 times. This demonstration paves the way to 50Ω ultra-compact cryogenic microwave devices.