2018/09/04 by P. V. Klimov, J. Kelly, Z. Chen +30 · 2 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.121.090502
published as Phys. Rev. Lett. 121, 090502 (2018) · 7 main pages, 3 main figures, 5 supplemental pages, 5 supplemental figures
arxiv created 2018/09/04 · arxiv updated 2018/09/05
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.