Dresden 2020 – wissenschaftliches Programm
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TT 31: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 1
TT 31.2: Vortrag
Mittwoch, 18. März 2020, 09:45–10:00, HSZ 03
Post-production Tile-and-Trim Process for Superconducting Lumped Element Resonators and Transmission Line Resonators in Microwave SQUID Multiplexers — •Felix Ahrens, Patrick Paluch, Daniel Richter, Constantin Schuster, Mathias Wegner, Christian Enss, and Sebastian Kempf — Kirchhoff-Institute for Physics, Heidelberg University, Germany
Microwave SQUID multiplexing (µMUXing) is likely the most promising technique to read out large metallic magnetic calorimeter (MMC) detector arrays. Here, high-quality superconducting GHz resonators based either on transmission lines or lumped-element inductors and capacitors are used for frequency encoding. These resonators are typically designed to have a bandwidth of ∼1 MHz to maintain the very fast signal rise time of MMCs and the frequency spacing between two neighbouring channels is set to ∼10 MHz to yield a cross-talk level below 10−4. However, due to fabrication inaccuracies, the resonance frequency of micro-fabricated resonators differs very often from the design value and the frequency spacings between neighbouring resonators severely scatter. In order to overcome the resulting µMUX performance degradation e.g. due to an enhanced cross-talk level a post-production fine-tuning of the resonance frequencies is essential. In this contribution we present our post-production tile-and-trim processes allowing to adjust the resonance frequency of both lumped element and transmission line resonators within a microwave SQUID multiplexer.