A plug-and-play two-way free-space link characterization system reaches 2.0e-19 fractional frequency instability at 10 s averaging over a 3.4 km folded intra-city path, with 94% uptime over 15 hours.
Clock with8× 10−19 systematic uncertainty,
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A plug-and-play solution for characterizing two-way optical frequency transfer over free-space
A plug-and-play two-way free-space link characterization system reaches 2.0e-19 fractional frequency instability at 10 s averaging over a 3.4 km folded intra-city path, with 94% uptime over 15 hours.