Fig. 5: Clock stabilities in pre-trial location.
From: Demonstration of a mobile optical clock ensemble at sea
Synthesised individual clock Modified Allan deviations (ModADEVs) calculated for the three direct optical comparisons (solid lines) and synthesised ModADEVs from 100 MHz measurements (dashed lines) while the clocks were on shore. 5071A counter reference is shown in black dashed line with closed circles. Shaded regions indicate the statistical confidence interval, as described in ref. 49. Use of the three-cornered hat method allows extraction of the performance of each individual clock, without noise or drift contributions from the 5071A counter reference. As discussed in text, the 100 MHz measurements are limited by counter noise, while the direct 1 GHz UofA Yb and UofA Rb clock comparison, as well as the three direct inter-clock optical comparisons, are not limited by this noise source.
