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TT: Fachverband Tiefe Temperaturen

TT 11: Superconductivity: Poster

TT 11.45: Poster

Montag, 17. März 2025, 15:00–18:00, P4

Fully tunable C-shunted Flux Qubits for TLS Research — •Benedikt Berlitz¹, Alexey V. Ustinov^1,2, and Jürgen Lisenfeld¹ — ¹Physikalisches Institut, Karlsruhe Institute of Tech- nology (KIT), Karlsruhe, Germany — ²IQMT, 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 systems. The qubits in turn can be used as a tool to study the properties of TLS. We fabricated fully tunable, capacitively shunted superconducting flux qubits specifically to be used as TLS detectors, aiming for good coherence in a wide accessible qubit frequency range. The goal is to gather comparable data of many defects located within the same device. We describe design, fabrication and measurements of the fabricated samples. Studying TLS with these tools will enhance our understanding of the underlying physics of TLS in amorphous ma- terials and hopefully reveal a path to achieving higher coherence with superconducting qubits.