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. 2022 Jul 27;607(7920):687–691. doi: 10.1038/s41586-022-04891-y

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — The correlations E_X,Y are obtained from the correlation (blue) and anticorrelation (red) probabilities of the device outputs for the eight input combinations. The data are fitted with sinusoidal functions estimating visibilities of 0.869(25) and 0.888(45). The settings for X = 2 or X = 3 (green background) contribute to the evaluation of the Bell parameter S = 2.578(75), whereas the QBER Q = 0.078(9) follows from settings with X = Y (yellow background). The error bars indicate statistical errors of one standard deviation. N = 3,342.