Accurate synchronization between remote clocks plays an important role in almost all types of precision
Now a research team from the NationalThe Time Service Center of the Chinese Academy of Sciences conducted two tests of synchronization performance between clocks separated by two types of optical fiber distances (7-kilometer intra-city fiber optic line and 50-kilometer laboratory fiber-optic line). The results were published in Optics Express and the Journal of Lightwave Technology.
Schematic setup for synchronizing quantum clocks over a 50-kilometer fiber optic link.
Image: NTSC
Scientists conducted field teststwo-way quantum synchronization between the H maser located on the NTSC campus (National Time Service Center at the Chinese Academy of Sciences) and the Rb clock at the LiShan Observatory (LSO), connected by a 7 km long deployed fiber. They observed both short-term and long-term synchronization stability.
The second experiment of the research group onfiber-optic two-way synchronization of quantum clocks on a laboratory fiber at a distance of up to 50 km has also been successful. As the authors of the study noted, their experiments demonstrate the potential for two-way synchronization of quantum clocks, especially based on urban fiber optic communication lines. This will simplify and reduce the cost of technology, as well as make it more practical.
A quantum clock is a type of atomic clock in which single ions cooled by a laser are held together in an electromagnetic ion trap.
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