Correction to: Nature Reviews Materials https://doi.org/10.1038/s41578-021-00306-y, published online 26 April 2021.

The caption for Figure 5a was incorrectly published as “Various types of spectral diffusion depending on the noise correlation time: (1) Gaussian broadened line (τc  < τ), (2) discrete spectral jumps and (3) spectral wandering.” The corrected text is “Various types of spectral diffusion depending on the noise correlation time: (1) discrete spectral jumps, (2) Gaussian broadened line (τc  < τ) and (3) spectral wandering”. This has been corrected both in the PDF and in the HTML versions of the article.