Dynamics of superconducting qubit coherence times due to fluctuations of two-level systems.
ORAL
Abstract
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 [Carroll et al., arXiv:2105.15201]. 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.
*We acknowledge the support received from the QUSTEC program funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement number 847471 and from the German Federal Ministry of Education and Research funding program quantum technologies - from basic research to the market under the contract number 13N15680 (GeQCoS), and DFG project FI 2549/1-1.
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Presenters
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Ivan Tsitsilin
- TU Munich