Hybrid fiber link achieves 4×10^{-21} frequency transfer stability over 43 km, verifies noise reciprocity to 3×10^{-20}, and reports first evidence of low-frequency interferometric noise.
Frequency ratio of Yb and Sr clocks with5× 10−17 uncertainty at 150 seconds averaging time,
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Studying fundamental limit of optical fiber links to $10^{-21}$ level
Hybrid fiber link achieves 4×10^{-21} frequency transfer stability over 43 km, verifies noise reciprocity to 3×10^{-20}, and reports first evidence of low-frequency interferometric noise.