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Updated: Feb 5, 2026

Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
Fluctuations of Energy-Relaxation Times in Superconducting Qubits
P V Klimov1, J Kelly1, Z Chen1
1Google, Santa Barbara, California 93117, USA.
Abstract:
Superconducting qubits are an attractive platform for quantum computing since they have demonstrated high-fidelity quantum gates and extensibility to modest system sizes. Nonetheless, an outstanding challenge is stabilizing their energy-relaxation times, which can fluctuate unpredictably in frequency and time. Here, we use qubits as spectral and temporal probes of individual two-level-system defects to provide direct evidence that they are responsible for the largest fluctuations. This research lays the foundation for stabilizing qubit performance through calibration, design, and fabrication.
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