Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 43: Superconducting Electronics: Qubits
TT 43.3: Talk
Wednesday, March 11, 2026, 10:00–10:15, CHE/0089
Embedding Superconducting Quantum Circuits in a Millimeter-Wave Environment — •Jakob Lenschen1, Sergei Masis1, Jürgen Lisenfeld1, Hannes Rotzinger1,2, and Alexey V. Ustinov1,2 — 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