Synchronization of Distant Optical Clocks at the Femtosecond Level
| Autor: | Deschenes, Jean-Daniel, Sinclair, Laura C., Giorgetta, Fabrizio R., Swann, William C., Baumann, Esther, Bergeron, Hugo, Cermak, Michael, Coddington, Ian, Newbury, Nathan R. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phys. Rev. X 6, 021016 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevX.6.021016 |
| Popis: | The use of optical clocks/oscillators in future ultra-precise navigation, gravitational sensing, coherent arrays, and relativity experiments will require time comparison and synchronization over terrestrial or satellite free-space links. Here we demonstrate full unambiguous synchronization of two optical timescales across a free-space link. The time deviation between synchronized timescales is below 1 fs over durations from 0.1 s to 6500 s, despite atmospheric turbulence and kilometer-scale path length variations. Over several days, the time wander is 40 fs peak-to-peak. Our approach relies on the two-way reciprocity of a single-spatial-mode optical link, valid to below 225 attoseconds across a turbulent 4-km path. This femtosecond level of time-frequency transfer should enable optical networks using state-of-the-art optical clocks/oscillators. Comment: 19 pages, 9 figures |
| Databáze: | arXiv |
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