Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 2: Implementations I
QI 2.7: Talk
Monday, March 9, 2026, 11:45–12:00, BEY/0245
Fast Monitoring of Qubit T1 Fluctuations from Single-Shot Readout — •Julian Englhardt1,2, Emily Wright1,2, Niklas Glaser1,2, Leon Koch1,2, Christian Schneider1,2, Benjamin Lienhard1,2, Max Werninghaus1,2, and Stefan Filipp1,2 — 1Technical University of Munich, TUM School of Natural Sciences, Department of Physics — 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
Temporal fluctuations in energy relaxation times (T1) on superconducting qubits can occur on fast and irregular timescales. A quantitative understanding of the underlying relaxation dynamics is important for improving qubit stability and therefore advancing the development of fault-tolerant superconducting quantum processors. We employ a new method by monitoring the qubit continuously and determining the average decay and excitation rates. Simulations suggest that the decay constant can be extracted on timescales significantly shorter than conventional T1 measurements, allowing for monitoring of relaxation dynamics two orders of magnitude faster than conventional approaches. Preliminary experimental results demonstrate the feasibility of this technique and its potential for identifying fast fluctuations in qubit performance. As we extract the information directly from single-shot data, we do not require any additional classical logic beyond active reset, making the method easily integrable into existing setups. We acknowledge financial support from GeQCoS, MUNIQC-SC, MCQST, OpenSuperQPlus100, Munich Quantum Valley, and Deutsche Forschungsgemeinschaft (DFG, German Research Foundation).
Keywords: Superconducting Qubits; T1 Fluctuation