论文标题
分析时间相关噪声对零噪声外推的影响
Analyzing the impact of time-correlated noise on zero-noise extrapolation
论文作者
论文摘要
零噪声外推是一种量子误差缓解技术，通常在理想的近似值下研究了作用在量子设备上的噪声不相关。在这项工作中，我们研究了在时间相关噪声的情况下，零噪声外推的可行性和性能。我们表明，与白噪声相反，与时间相关的噪声更难通过零噪声外推缓解，因为在不修改其光谱分布的情况下很难扩展噪声水平。如果将“局部”栅极级方法应用于噪声缩放，则此限制尤其强大。但是，我们发现即使在存在时间相关的噪声的情况下，“全局”噪声缩放方法，例如，全局统一折叠也可以非常可靠。我们还将门Trotterrization引入可能具有独立感兴趣的新噪声缩放技术。
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.
