Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 40, Issue 12, Pages 3723-3728Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2022.3153655
Keywords
Synchronization; Photonics; Optical fiber dispersion; Clocks; Optical fiber devices; Stability criteria; Optical fiber polarization; Frequency entanglement; synchronization; time synchronization
Funding
- National Natural Science Foundation of China [12033007, 61801458, 61875205, 91836301]
- Frontier Science Key Research Project of Chinese Academy of Sciences [QYZDB-SW-SLH007]
- Strategic Priority Research Program of CAS [XDC07020200]
- Youth Innovation Promotion Association, CAS [2021408]
- Western Young Scholar Project of CA Sunder [XAB2019B17, XAB2019B15]
- Chinese Academy of Sciences [ZDRW-KT-2019-1-0103]
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This paper reports a fiber-optic two-way quantum clock synchronization experiment, demonstrating the feasibility of achieving femtosecond-scale synchronization precision over a distance of 50 km. Comparable performance can also be achieved even with independent reference clocks in combination with microwave frequency transfer technology.
Fiber-optic Quantum clock synchronization has been proposed and experimentally demonstrated for its potential enhancements in precision and better guarantee of security. To further prove its advantage in practical applications, it is necessary to test its synchronization performance between clocks apart for at least intracity optical fiber distance. In this paper, we report a fiber-optic two-way quantum clock synchronization experiment with the distance reaching 50 km. With the common reference clock, a synchronization stability of 54.6 fs at 57300 s and an accuracy of 1.3 ps +/- 36.6 ps have been achieved. With independent reference clocks, comparable performance has also been achieved combined with the microwave frequency transfer technology, which shows a stability of 89.5 fs at 57300 s. These results nicely showcase the feasibility of the two-way quantum clock synchronization to provide femtosecond-scale synchronization precision over intracity optical fiber links.
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