Analyzing the impact of time-correlated noise on zero-noise extrapolation

Zero-noise extrapolation is a quantum error mitigation technique that has typically been studied under the ideal approximation that the noise acting on a quantum device is not time-correlated. In this work, we investigate the feasibility and performance of zero-noise extrapolation in the presence of...

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Bibliographic Details
Published in:arXiv.org 2022-09
Main Authors: Schultz, Kevin, LaRose, Ryan, Mari, Andrea, Quiroz, Gregory, Shammah, Nathan, Clader, B David, Zeng, William J
Format: Article
Language:English
Subjects:
Correlation
Extrapolation
Noise levels
Scaling
Time correlation functions
White noise
Online Access:Get full text
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Summary:Zero-noise extrapolation is a quantum error mitigation technique that has typically been studied under the ideal approximation that the noise acting on a quantum device is not time-correlated. In this work, we investigate the feasibility and performance of zero-noise extrapolation in the presence of time-correlated noise. We show that, in contrast to white noise, time-correlated noise is harder to mitigate via zero-noise extrapolation because it is difficult to scale the noise level without also modifying its spectral distribution. This limitation is particularly strong if "local" gate-level methods are applied for noise scaling. However, we find that "global" noise scaling methods, e.g., global unitary folding, can be sufficiently reliable even in the presence of time-correlated noise. We also introduce gate Trotterization as a new noise scaling technique that may be of independent interest.
ISSN:2331-8422
DOI:10.48550/arxiv.2201.11792