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TT: Fachverband Tiefe Temperaturen

TT 58: Poster: Superconductivity II

TT 58.13: Poster

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

Fast quantum state tomography with superconducting qubits — •Andras Di Giovanni¹, Adrian Aasen³, Moritz Reh³, Martin Gärttner³, Markus Griedel², Hannes Rotzinger^1,2, and Alexey Ustinov^1,2 — ¹Physikalisches Institut, Karlsruher Institut für Technologie, Karlsruhe — ²Institut für Quantenmaterialien und Technologien, Karlsruher Institut für Technologie, Karlsruhe — ³Kirchhoff-Institut für Physik, Heidelberg

Quantum simulators promise insights into quantum many-body problems in regimes where classical simulation methods hit a complexity wall. One challenge towards this goal is to develop well characterized building blocks that allow to scale system sizes up while conserving reliability in terms of errors. A promising platform for building such quantum simulators are superconducting quantum circuits. We characterize small-scale quantum processors in the time domain with single-shot accuracy and minimal hardware and post-processing overhead. For this purpose we use reactive basis rotations based on greedy algorithms and adaptive Bayesian tomography. We present experimental results measured on a transmon qubit and compare the data with theoretical predictions.