Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Superconductivity: Poster

TT 11.47: Poster

Monday, March 17, 2025, 15:00–18:00, P4

Dual Tone Spectroscopy of Atomic Tunneling Systems — •Jan Blickberndt, Anton Jarecka, Moritz Maur, Andreas Reiser, Andreas Fleischmann, and Christian Enss — Kirchhoff Institute for Physics, Heidelberg University

Atomic Tunneling Systems (TSs) are intrinsic to disordered structures and thin films, inevitably impacting microstructured devices by causing noise and decoherence in all kinds of applications ranging from Josephson Junctions to cryogenic detector readout chains. Understanding the dynamics of these random fluctuators is essential to mitigate their deteriorative effects on superconducting quantum devices. To investigate the non-equilibrium dielectric behavior of TSs under electric bias, we developed a novel LC resonator setup based on a Wheatstone bridge design. This configuration features two resonance branches that share a common dielectric host material in their capacitors, thereby probing the exact same ensemble of TSs. By applying an external bias field via a cover electrode, we can modulate the energy states of the TSs, enabling their transition between the two resonance modes which allows us to explore ensemble properties as well as the non-linear dynamics of two-level systems. Our current experiments confirm the functionality of the device. To complement the experimental work, we developed a Monte Carlo simulation framework to validate and extend our findings.

Keywords: Microwave Resonators; Tunneling Systems; Amorphous Dielectrics