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 paper, 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.

Impact of time-correlated noise on zero-noise extrapolation

Mari A.;
2022-01-01

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 paper, 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.
2022
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/475333
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