Description:
<jats:p>We study the two-body momentum correlation signal in a quasi one
dimensional Bose-Einstein condensate in the presence of a sonic horizon.
We identify the relevant correlation lines in momentum space and compute
the intensity of the corresponding signal. We consider a set of
different experimental procedures and identify the specific issues of
each measuring process. We show that some inter-channel correlations, in
particular the Hawking quantum-partner one, are particularly well
adapted for witnessing quantum non-separability, being resilient to the
effects of temperature and/or quantum quenches.</jats:p>