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TT: Fachverband Tiefe Temperaturen

TT 43: Superconducting Electronics: Qubits

TT 43.3: Vortrag

Mittwoch, 11. März 2026, 10:00–10:15, CHE/0089

Embedding Superconducting Quantum Circuits in a Millimeter-Wave Environment — •Jakob Lenschen¹, Sergei Masis¹, Jürgen Lisenfeld¹, Hannes Rotzinger^1,2, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut (PHI), Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — ²Institut für Quantenmaterialien and Technologie (IQMT), Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany

Superconducting mm-wave quantum circuits operating at around 100 GHz offer many interesting new possibilities. Compared to microwave implementations, the higher photon energy and wider bandwidth enhance resilience to thermal fluctuations, and speed up qubit manipulations. However, mm-wave measurements at ultra-low temperatures are largely unexplored, and technical challenges demand alternative approaches [1]. The coherence and energy relaxation of superconducting quantum circuits is sensitive to a variety of loss mechanisms, e.g. interference with parasitic modes in the sample box and within the chip. Particular attention is required for mm-waves, as their wavelength is comparable to the dimensions of the dielectric substrate and many other structures in a conventional sample box. We have developed several approaches for coupling superconducting quantum circuits to waveguides, utilizing machined ridge gap waveguides and other techniques. In this presentation, we will discuss embedded superconducting mm-wave quantum chips, parasitic modes, and ways to inhibit or channel them out. We will compare our simulations with the experimental results.
[1] Lenschen et al., arXiv:2411.15058 (2024)

Keywords: mm-wave; resonators; dielectric substrate mode