05 October 2022
The research group led by Pan Jianwei from University of Science and Technology of China has realized the experiment on free-space high precision time and frequency dissemination across 113 km for the first time in the world, with dissemination of time stability reaching the femtosecond level, which can meet the time dissemination requirements of the optical clock with the current highest precision. This achievement in basic scientific research is expected to have major applications in the study of fundamental problems in physics, from navigation, to gravitational wave detection, to dark matter search. The technique can not only be directly used in ground-based applications, but could also lay the groundwork for future satellite time-frequency dissemination.
link to Nature publication