International fiber-linked comparison of optical clocks achieves 7.7×10^{-18} agreement between independent ^{171}Yb^+ (E3) clocks at NPL and PTB, the first such verification below 10^{-17}.
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International Optical Clock Comparison Using the European Optical Fiber Network
International fiber-linked comparison of optical clocks achieves 7.7×10^{-18} agreement between independent ^{171}Yb^+ (E3) clocks at NPL and PTB, the first such verification below 10^{-17}.