Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.39: Poster
Monday, March 17, 2025, 15:00–18:00, P4
Observing measurement-induced transitions in a transmon qudit — •Philippe Gigon1,2, Zihao Wang3, Benjamin D’Anjou1, Alexandre Blais1, and Machiel Blok3 — 1Université de Sherbrooke — 2Walther-Meißner-Institut — 3University of Rochester
Numerous experiments have shown that high-power dispersive transmon readout can lead to unexpected state transitions. Significant theoretical efforts have been made to describe these transitions using a simplified model, avoiding the need to account for the full Lindbladian dynamics of the coupled resonator-transmon system [1,2,3,4]. In this study, we employ a semi-classical effective drive model combined with Floquet theory and compare its predictions with experimental results from a transmon qudit. The high controllability and the readout capabilities of the qudit make it the perfect tool to study measurement-induced transitions. Our findings reveal that the semi-classical model accurately predicts critical photon numbers, identifies the states involved in the transitions, and quantifies the affected population.
[1] D. Sank et al., Phys. Rev. Lett. 117, 190503 (2016).
[2] M. Khezri et al., Phys. Rev. Appl. 20, 054008 (2023).
[3] R. Shillito et al., Phys. Rev. Appl. 18, 034031 (2022).
[4] M. F. Dumas et al., Phys. Rev. X 14, 041023 (2024).
Keywords: Transmon qubits; Qubit readout; Measurement-induced transitions; Floquet Theory; Driven quantum systems