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Fluctuations of Energy-Relaxation Times in Superconducting Qubits

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arxiv 1809.01043 v1 pith:Y6XI2LT7 submitted 2018-09-04 quant-ph

P. V. Klimov , J. Kelly , Z. Chen , M. Neeley , A. Megrant , B. Burkett , R. Barends , K. Arya
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B. Chiaro Yu Chen A. Dunsworth A. Fowler B. Foxen C. Gidney M. Giustina R. Graff T. Huang E. Jeffrey Erik Lucero J. Y. Mutus O. Naaman C. Neill C. Quintana P. Roushan Daniel Sank A. Vainsencher J. Wenner T. C. White S. Boixo R. Babbush V. N. Smelyanskiy H. Neven John M. Martinis
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keywords qubitsenergy-relaxationfluctuationsquantumstabilizingsuperconductingtheytimes
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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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Cited by 1 Pith paper

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  1. Non-Gaussian Noise Magnetometry Using Local Spin Qubits

    quant-ph 2025-05 conditional novelty 6.0 of 10

    A single NV spin qubit and two-qubit coincidence or Bell-state echoes can isolate fourth-order magnetic noise cumulants, demonstrated on telegraph-noise and critical Ising models.

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