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TT: Fachverband Tiefe Temperaturen

TT 47: Superconducting Electronics: Qubits I (joint session TT/QI)

TT 47.13: Vortrag

Mittwoch, 20. März 2024, 18:00–18:15, H 0104

Characterizing the origin of non-Markovian noise in superconducting qubits and its effect on quantum algorithms — •Ivan Rungger, Abhishek Agarwal, Lachlan Lindoy, Deep Lall, and Francois Jamet — National Physical Laboratory, Teddington TW11 0LW, United Kingdom

Non-Markovian noise can be a significant source of errors in superconducting qubits. It is caused by ubiquitous effects such as quasiparticle induced charge parity fluctuations, as well as frequency fluctuations induced by two level systems or other defects. We develop a method based on mirrored pseudo-identity gates to characterise the non-Markovian noise in qubits [1]. We show that Markovian noise models fail to capture the experimental behaviour, and that only by including the non-Markovian components one can describe the experiments. We further present fast time-resolved characterization techniques that allow us to identify the physical origin of the non-Markovian noise. We find large changes of the dominating noise contributions, such as qubit frequency fluctuations, over both long time-scales of hours and days, and also over very short micro-seconds time-scales. We show that the developed noise model allows us to predict and then mitigate the effects of noise in quantum computing applications.

[1] A. Agarwal, L. P. Lindoy, D. Lall, F. Jamet, I. Rungger, arXiv:2306.13021 (2023)

Keywords: Superconducting qubits; Non-Markovian noise model; Two-level systems; Quantum Algorithms