The ability to make measurements of time and fundamental physical constants with extreme precision makes it possible to test theories to ever greater levels of scrutiny. A workshop in Tokyo in January discussed the challenges involved and the progress being made.
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Horiuchi, N. A never-ending quest. Nature Photon 10, 213–215 (2016). https://doi.org/10.1038/nphoton.2016.48
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DOI: https://doi.org/10.1038/nphoton.2016.48