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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.31: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Microwave SQUID multiplexer based on lumped element resonators — •Constantin Schuster, Mathias Wegner, Felix Ahrens, Daniel Richter, Christian Enss, and Sebastian Kempf — Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany

To our present knowledge, microwave SQUID multiplexing is the most promising technique for reading out large detector arrays consisting of hundreds or even thousands of metallic magnetic calorimeters. Here, a non-hysteretic rf-SQUID is used to convert the detector signal into a phase or amplitude change of a superconducting microwave resonator for frequency encoding. So far, quarterwave transmission line resonators have been used exclusively, which somehow suffer from rather large lateral dimensions, severe sensitivity to frequency noise due to atomic tunneling systems as well as a challenging frequency control considering fabrication inaccuracies.

In this contribution we will present a microwave SQUID multiplexer (LEMUX) which is based on lumped element resonators and allows for a significantly increased channel density on the chip as well as the possibility for trimming the resonance frequency. We introduce our LEMUX design with a new generation of optimised rf-SQUIDs, discuss the achieved device performance and compare it to existing microwave SQUID multiplexers based on transmission line resonators.