Hi,
Andrew Ludlow himself was so kind to send me the Sciencexpress article,
just a few minutes ago..
A pity that I can't post it here (2.2MB).
The Allan deviation is nearly linear, following roughly a
3.2E-16/sqrt(tau) equation (calculated for a single clock).
At tau = 1 sec, the instability is about 2e-16 increasing to 3e-16 at
3sec, then approaching the given equation.
1.6e-18 is attained at 25.000sec only.
The interrogation time seems to be 1-5sec, still with many interruptions
(25% time-outs).
Further realistic improvements (more atoms, mitigation of several
parasitic effects) may yield 1e-18 in 100sec in the future.
Frank
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