SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Quantum Coherence and Quantum Information Systems I
TT 49.6: Vortrag
Donnerstag, 30. März 2023, 12:45–13:00, HSZ 304
Dynamics of superconducting qubit coherence times due to fluctuations of two-level systems — •Ivan Tsitsilin1,2 and Stefan Filipp1,2 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
Recent studies have shown that the stability of coherence times is strongly affected by two-level systems (TLSs). This is caused by chaotic frequency fluctuations of TLSs, which, when in proximity to the qubit resonance, significantly reduce its T1 times. Understanding and mitigating this behavior is crucial to realize functional quantum processing devices based on superconducting qubits. In this work, we perform a long-time stability analysis of the qubit T1 times as a function of qubit frequency utilizing the AC-Stark shifting technique[1]. We present an extensive analysis of the TLS distributions and their impact on T1 times for different qubit sample materials and RF line configurations. Furthermore, our results provide insight into the effect of the noise spectrum on the behavior and density of TLSs.
[1] Carroll et al., arXiv:2105.15201