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TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Poster

TT 18.42: Poster

Montag, 18. März 2024, 15:00–18:00, Poster C

A mm-wave platform for superconducting qubits — •Urs Strobel¹, Jakob Lenschen¹, Jürgen Lisenfeld¹, Hannes Rotzinger^1,2, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut (PHI), Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — ²Institut für Quanten Materialien und Technologien (IQMT), Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany

Superconducting quantum circuits which are operating at frequencies one order of magnitude larger than those demonstrated until now, e.g. at a frequency of about 100 GHz, would offer numerous new possibilities. Due to the increased qubit energy level separation, such qubits could be operated at temperatures much higher than their present counterparts, qubit logic gates can be performed faster and circuit components reduced in size thus allowing for a smaller footprint, denser packaging and better integration. These potential advantages face many challenges and pose intriguing physics questions.

We are developing a versatile experimental platform for the low temperature investigation of mm-wave resonators and qubits. This includes the mm-wave cryogenic wiring, sample holders and thin film process technology for the superconducting qubits. We explore several suitable superconducting thin film materials, which we study for a better comparison with conventional materials also at microwave frequencies.

Keywords: superconductivity; qubit; mm-wave