SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 5: Poster Session: Superconductivity

TT 5.28: Poster

Monday, September 27, 2021, 13:30–16:00, P

Probing the Density of States of Defects in Superconduncting Flux Qubits — •Benedikt Berlitz¹, Alexander Neumann¹, Alexey V. Ustinov^1,2,3, and Jürgen Lisenfeld¹ — ¹Physikalisches Institut Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany) — ²National University of Science and Technology MISIS, Moscow, Russia — ³Russian Quantum Center, Skolkovo, Moscow, Russia

Material defects forming two-level-systems (TLS) present a source of decoherence and unwanted degrees of freedom in superconduncting quantum systems. Current theoretical models make different assumptions about the frequency dependence of the TLS' density-of-states (DOS). We intend to measure the TLS' DOS in a wide frequency range, spanning ~0.1 to 20 GHz, using widely tunable flux-qubits specifically designed as TLS-scanners. Measuring the DOS will enhance our understanding of the underlying physics of TLS in amorphous materials.