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.
@article{arxiv.1809.01043,
title = {Fluctuations of Energy-Relaxation Times in Superconducting Qubits},
author = {P. V. Klimov and J. Kelly and Z. Chen and M. Neeley and A. Megrant and B. Burkett and R. Barends and K. Arya and B. Chiaro and Yu Chen and A. Dunsworth and A. Fowler and B. Foxen and C. Gidney and M. Giustina and R. Graff and T. Huang and E. Jeffrey and Erik Lucero and J. Y. Mutus and O. Naaman and C. Neill and C. Quintana and P. Roushan and Daniel Sank and A. Vainsencher and J. Wenner and T. C. White and S. Boixo and R. Babbush and V. N. Smelyanskiy and H. Neven and John M. Martinis},
journal= {arXiv preprint arXiv:1809.01043},
year = {2018}
}
Comments
7 main pages, 3 main figures, 5 supplemental pages, 5 supplemental figures