[time-nuts] The cross-correlation catastrophe

Magnus Danielson magnus at rubidium.dyndns.org
Tue Jan 26 07:07:52 UTC 2016

Fellow time-nuts,

Over a year and a half or so, we have been starting to grasp the various 
aspects of the cross-correlation catastrophe. This consists of two 
properties, one is the insertion of anti-correlated noise into the two 
channels, and then when cross-correlated it produced a subtracting 
"energy" reducing the level and even inverting the sign. Thus, there is 
a bias in the estimation and overoptimistic or even seemingly physically 
impossible (until you understand the mechanics). This have been 
occupying the mind of some of the best folks we have in the field.
Just interacting and discussing this with some of them have been a great 
learning experience. Anyway, here is a write-up that covers it sufficiently:


So, now you know why I look suspiciously at too low noise-levels.


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