Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 55: Superconducting Electronics: SQUIDs, Qubits, Circuit QED III

TT 55.1: Talk

Friday, March 21, 2025, 09:30–09:45, H36

Superconducting devices based on the NbTiN Josephson junctions — •Vasilii Sevriuk¹, Azat Gubaydullin¹, Aki Ruhtinas², Michael Perelshtein¹, Alexey Mironov¹, Pertti Hakonen³, Ilari Maasilta², and Valerii Vinokur¹ — ¹Terra Quantum AG, Kornhausstrasse 25, 9000 St. Gallen, Switzerland — ²Nanoscience Center, Department of Physics, University of Jyväskylä, FI-40014 Jyväskylä, Finland — ³QTF Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 AALTO, Finland

Quantum devices based on superconducting circuits are a promising technology that could have a significant impact on many aspects of human life. However, the production of high-coherence circuits remains one of the key challenges. Recent results on the fabrication of NbTiN Josephson junctions using a focused helium ion beam [1] suggest that this method is well-suited for a wide range of applications in superconducting electronics, due to the excellent mechanical, electrical, and microwave properties of NbTiN. Here we present our results on the characterization of the superconducting circuits based on this technology.

[1] A. Ruhtinas, I. Maasilta, arXiv:2303.17348v2.

Keywords: Josephson junction; NbTiN; niobium titanium nitride; superconducting circuits; quantum devices