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Klimov, P V; Kelly, J; Chen, Z; Neeley, M; Megrant, A; Burkett, B; Barends, R; Arya, K; Chiaro, B; Chen, Yu; Dunsworth, A; Fowler, A; Foxen, B; Gidney, C; Giustina, M; Graff, R; Huang, T; Jeffrey, E; Lucero, Erik; Mutus, J Y; Naaman, O; Neill, C; Quintana, C; Roushan, P; Sank, Daniel; Vainsencher, A; Wenner, J; White, T C; Boixo, S; Babbush, R; Smelyanskiy, V N; Neven, H; Martinis, John M
Physical review letters, 08/2018, Volume: 121, Issue: 9Journal Article
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.
