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TT: Fachverband Tiefe Temperaturen

TT 58: Poster: Superconductivity II

TT 58.12: Poster

Donnerstag, 30. März 2023, 15:00–18:00, P2/OG3

Probing the density of states of defects in superconducting flux qubits — •Benedikt Berlitz, Alexander Konstantin Händel, Alexey V. Ustinov, and Jürgen Lisenfeld — Physikalisches Institut, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

Material defects forming two-level systems (TLS) present a source of decoherence and unwanted degrees of freedom in superconducting quantum circuits. Current theoretical models make different assumptions about the frequency dependence of the TLS' density of states (DOS). To measure the TLS' DOS in a wide frequency range, spanning from about 0.1 to 20 GHz, we fabricated flux qubits as TLS detectors. Measuring the DOS will enhance our understanding of the underlying physics of TLS in amorphous materials.