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TT: Fachverband Tiefe Temperaturen
TT 55: Superconducting Electronics: SQUIDs, Qubits, Circuit QED III
TT 55.6: Vortrag
Freitag, 21. März 2025, 10:45–11:00, H36
Spectroscopic characterization of noise and decoherence mechanisms in superconducting qubits — •Julian Englhardt1,2, Emily Wright1,2, Niklas Glaser1,2, Leon Koch1,2, Ivan Tsitsilin1,2, Christian Schneider1,2, 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
Dynamical decoupling sequences during free evolution time have proven effective in suppressing the impact of environmental noise in superconducting qubits, thereby increasing coherence times towards the theoretical 2T1 limit. While primarily used for error suppression during quantum computation, these sequences can also serve as a diagnostic tool for noise characterization by revealing the qubit's response across specific frequency ranges. Beyond standard dynamical decoupling sequences, here we employ additional methods such as time resolved single-shot Ramsey measurements to probe low-frequency noise sources and the signature noise spectra of specific decoherence events. Specifically, we investigate charge parity jumps in superconducting Transmon qubits induced by quasiparticle tunneling across the Josephson junction. We believe that the combined toolkit for noise spectroscopy can contribute to the understanding of decoherence mechanisms in superconducting qubits.
We acknowledge financial support from GeQCoS, MUNIQC-SC, MCQST, OpenSuperQPlus100, the Munich Quantum Valley and the Deutsche Forschungsgemeinschaft.
Keywords: Superconducting Qubits; Quasiparticles; Noise Spectroscopy