Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 59: Transport: Poster

TT 59.16: Poster

Wednesday, March 20, 2024, 15:00–18:00, Poster E

Non-linear Dynamics of Two-level Tunneling Systems in Non-equilibrium — •Anton Jarecka, Jan Blickberndt, Andreas Reiser, Andreas Fleischmann, and Christian Enss — Kirchhoff-Institute for Physics, Heidelberg, Germany

The performance of state-of-the-art superconducting quantum devices is predominantly limited by the dielectric loss as well as the related noise and decoherence effects, which are known to originate from atomic tunneling systems (TSs). In an effort to further understand the coupling of such TSs to superconducting quantum devices, we investigate their dielectric properties and non-equilibrium behavior under the influence of high frequency electric bias fields utilizing a novel resonator setup. The superconducting resonator consists of four identical interdigital capacitors (IDCs) microstructured on to a dielectric bulk glass sample, arranged in a Wheatstone bridge and two inductors, resulting in two decoupled resonance frequencies. A cover electrode is used to create the electrical bias field that modulates the TSs' energy splitting which allows to probe the non-linear behavior of the same ensemble of TS at two different resonator frequencies independently. This can be used to measure the dielectric loss of an excited TS by moving it from one resonance frequency to the other. Experiments of this type will give further insight into the non-linearities of an ensemble of TSs.

Keywords: tunneling system; dielectric loss; decoherence; glass; electrical bias