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arXiv · 2201.11792

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

Kevin Schultz·Ryan LaRose·Andrea Mari·Gregory Quiroz·Nathan Shammah·B. David Clader·William J. Zeng
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Abstract

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.

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Kevin Schultz, Ryan LaRose, Andrea Mari, Gregory Quiroz, Nathan Shammah, B. David Clader, William J. Zeng. 2022-01-27. Analyzing the impact of time-correlated noise on zero-noise extrapolation. https://doi.org/10.1103/physreva.106.052406

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