Optical clocks held at slightly different heights provide a stringent test of general relativity comparable to space experiments and open new opportunities for clock-based geophysical sensing.
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Bongs, K., Singh, Y. Earth-based clocks test general relativity. Nat. Photonics 14, 408–409 (2020). https://doi.org/10.1038/s41566-020-0654-5
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DOI: https://doi.org/10.1038/s41566-020-0654-5
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