Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Superconductivity: Poster

TT 11.44: Poster

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

Mapping Locations of Two Level Defects in Superconducting Quantum Circuits — •David Mazibrada¹, Johannes Schwenk¹, Jürgen Lisenfeld¹, Hannes Rotzinger^1,2, Philip Willke¹, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut, 76131 Karlsruhe, Germany — ²Institut for Quantum Materials and Technologies, 76131 Karlsruhe, Germany

The development of superconducting quantum circuits has drawn attention to the study of microscopic two-level systems (TLS), as they are a source of decoherence and instability of qubits. Individual TLS can be manipulated using microwave signals, but their specific locations in quantum circuits remain largely unclear. We intend to manipulate the TLS using the electric field of an atomic force microscope tip [1]. This approach should allow us to gain insights into the microscopic nature of the TLS. We will present the assembled atomic force microscope setup and show characterisation data of quantum circuits measured at millikelvin temperatures.

[1] M. Hegedüs, et al., arXiv:2408.16660v1 (2024)

Keywords: Qubits; Two Level Systems; Atomic Force Microscopy