Comparing ultrastable lasers at 7 × 10-17 fractional frequency instability through a 2220 km optical fibre network.
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Nat Commun. 2022 Jan 11;13(1):212. doi: 10.1038/s41467-021-27884-3.
Nat Commun. 2022.
PMID: 35017500
Free PMC article.