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O: Fachverband Oberflächenphysik

O 19: Vacuum Science & Technology: Theory and Applications – Poster

O 19.7: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Development of a Low Temperature Two-Level System Microscope for Superconducting Quantum Circuits — •David Mazibrada¹, Johannes Schwenk¹, Jürgen Liesenfeld¹, Hannes Rotzinger^{1, 2}, Philip Willke¹, and Alexey V. Ustinov^{1, 2} — ¹Physikalisches Institut (PHI) — ²Institut for Quantum Materials and Technologies (IQMT), Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany

Superconducting quantum circuits are among the most advanced platforms for solid-state qubits. Their performance is perturbed, however, by parasitic two-level systems (TLS). The electric fields of the qubit interact with the electrical dipole moment of the TLS, leading to an exchange of photons between the two quantum systems. TLS are mostly of an unknown nature and position, and identifying them locally would help to improve future qubits. Since TLS couple not only to the qubit’s microwave field but also to externally applied electric fields, this interaction enables us to probe and localize individual TLS.
We present a microscope combining a cryogenic atomic force microscope (AFM) and a superconducting quantum circuit. By applying a local electric field with the AFM tip and performing microwave spectroscopy, we aim to identify, characterize, and map the position of individual TLS on superconducting quantum circuits.

Keywords: Two Level Defects; Superconducting Electronics; Qubits; Atomic Force Microscope; Cryogenics