Comparing ultrastable optical frequency standards developed in different laboratories presents a significant challenge. However, a group at the National Institute of Standards and Technology in Boulder has now demonstrated a prototype coherent ring network that rises to the test.
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Margolis, H. Moving metrology. Nature Photon 1, 258–259 (2007). https://doi.org/10.1038/nphoton.2007.55
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DOI: https://doi.org/10.1038/nphoton.2007.55
