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TT: Fachverband Tiefe Temperaturen

TT 50: Superconducting Electronics: SQUIDs, Qubits, Circuit QED II

TT 50.5: Vortrag

Donnerstag, 20. März 2025, 16:00–16:15, H36

Dielectric waveguide setup tested with a superconducting millimeter-wave Fabry-Pérot interferometer at milli-Kelvin temperatures — •Jakob Lenschen¹, Hannes Rotzinger^1,2, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut (PHI), Karlsruher Institut für Technologie — ²Institut für Quantenmaterialien und Technologie (IQMT), Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany

Superconducting quantum circuits operating at mm-wave frequencies of around 100 GHz may offer many interesting new possibilities. The order of magnitude higher photon energy compared to current implementations and the wider bandwidth would not only improve the resilience to thermal fluctuations, but could also speed up qubit manipulation. Millimeter-wave measurements at ultra-low temperatures are largely unexplored due to several technical difficulties, such as a difficult signal path isolation and thermalization. We have developed a cryogenic setup consisting of dielectric waveguides and a superconducting Fabry-Pérot cavity located at the dilution cryostat base temperature. We show that the quality of the mm-wave signal guided to and from a temperature of 10 mK is sufficient to measure resonator cavity quality factors of over one million at 110 GHz in the few photon limit.

Keywords: mm-wave; dielectric waveguides; Fabry-Perot cavity; circuit QED