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- W4387687122 abstract "Optical clock network requires the establishment of optical frequency transmission link between multiple optical clocks, utilizing narrow linewidth lasers. Despite achieving link noise levels of 10${^{-20}}$, the final accuracy is limited by the phase noise of the clock laser. Correlation spectroscopy is developed to transmit frequency information between two optical clocks directly, enabling optical clock comparison beyond the phase noise limit of clock lasers, and significantly enhancing the measurement accuracy or shorten the measurement time. In this letter, two compact transportable ${^{40}}$Ca${^+}$ clocks are employed to accomplish the correlation spectroscopy comparison, demonstrating an 10 cm level measurement accuracy of chronometric leveling using a mediocre clock laser with linewidth of 200 Hz. The relative frequency instability reaches $6.0times10{^{-15}}/sqrt{tau/s}$, which is about 20 times better than the result with Rabi spectroscopy using the same clock laser. This research greatly reduces the harsh requirements on the performance of the clock laser, so that an ordinary stable-laser can also be employed in the construction of optical clock network, which is essential for the field applications, especially for the chronometric leveling." @default.
- W4387687122 created "2023-10-17" @default.
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- W4387687122 date "2023-10-12" @default.
- W4387687122 modified "2023-10-18" @default.
- W4387687122 title "Demonstration of chronometric leveling using transportable optical clocks beyond laser coherence limit" @default.
- W4387687122 doi "https://doi.org/10.48550/arxiv.2310.08835" @default.
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