Optical Atomic Clock Comparison through Turbulent Air
| Autor: | Colin Kennedy, W. F. McGrew, Stefan A. Schäffer, John Robinson, Nathan R. Newbury, Jean-Daniel Deschênes, Xiaogang Zhang, Sarah L. Bromley, Isaac H. Khader, Samuel M. Brewer, Jun Ye, Jeff Sherman, William C. Swann, Amanda Koepke, Jwo-Sy Chen, Thomas E. Parker, David R. Leibrandt, Laura C. Sinclair, R. J. Fasano, Dhruv Kedar, Eric Oelker, David Hume, Tara M. Fortier, Andrew D. Ludlow, Tobias Bothwell, Jian Yao, Stefania Romish, Kyle Beloy, Holly Leopardi, Youssef S. Hassan, William R. Milner, Scott A. Diddams, Daniele Nicolodi, Martha I. Bodine, Lindsay Sonderhouse |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Ytterbium Strontium Physics - Instrumentation and Detectors Turbulence FOS: Physical sciences chemistry.chemical_element Instrumentation and Detectors (physics.ins-det) Measure (mathematics) Atomic clock Frequency comb chemistry Transfer (computing) Fiber Atomic physics Optics (physics.optics) Physics - Optics |
| Popis: | 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 non-stationary, 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 $6\times10^{-19}$, showing that O-TWTFT can support free-space atomic clock comparisons below the $10^{-18}$ level. |
| Databáze: | OpenAIRE |
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