ACKNOWLEDGMENTS
We thank A. Johnson, P. Knöpfel, G. Martin, and G. Holderied for
technical support.Funding:Funding was provided by the Swiss
National Science Foundation as part of the National Centre of
Competence in Research, Quantum Science and Technology
(NCCR-QSIT), grant CRSII5_183579, and by the University of Basel.
Author contributions:M.S. and Z.M. carried out the experiments
and analyzed the data. K.N. and G.H. contributed to developing
the experimental methodology and setup. S.W. conceived and
supervised the project. All authors contributed to the writing of the
manuscript.Competing interests:The authors declare no
competing interests.Data and materials availability:The raw
data supporting the findings of this study are available at the
Zenodo repository ( 54 ).SUPPLEMENTARY MATERIALS
science.sciencemag.org/content/367/6483/1213/suppl/DC1
Supplementary Text
Fig. S1
References ( 55 – 62 )
25 October 2019; accepted 31 January 2020
10.1126/science.aaz9837Sinhalet al.,Science 367 , 1213–1218 (2020) 13 March 2020 6of6
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