Optical atomic clock comparison through turbulent air
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- PhysRevResearch.2.033395
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We use frequency-comb-based optical two-way time-frequency transfer (O-TWTFT) to measure the optical frequency ratio of state-of-the-art ytterbium and strontium optical atomic clocks separated by a 1.5-km open-air link. Our free-space measurement is compared to a simultaneous measurement acquired via a noise-cancelled fiber link. Despite nonstationary, ps-level time-of-flight variations in the free-space link, ratio measurements obtained from the two links, averaged over 30.5 hours across six days, agree to 6×10-19, showing that O-TWTFT can support free-space atomic clock comparisons below the 10-18 level.
Originalsprog | Engelsk |
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Artikelnummer | 033395 |
Tidsskrift | Physical Review Research |
Vol/bind | 2 |
Udgave nummer | 3 |
ISSN | 2643-1564 |
DOI | |
Status | Udgivet - sep. 2020 |
Eksternt udgivet | Ja |
Bibliografisk note
Publisher Copyright:
© 2020 authors. Published by the American Physical Society.
ID: 324557353