Muñoz De Nova, Juan RamónSols Lucía, FernandoZapata, I.2023-06-182023-06-182015-101367-263010.1088/1367-2630/17/10/105003https://hdl.handle.net/20.500.14352/24340©2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. We thank A Amo, F Michel, R Parentani, D Guéry-Odelin and J Steinhauer for valuable discussions. This work has been supported by MINECO (Spain) through grants FIS2010-21372 and FIS2013-41716-P, and by Comunidad de Madrid through grant MICROSERES-CM (S2009/TIC-1476).We consider a sonic black-hole scenario where an atom condensate flows through a subsonic–supersonic interface. We discuss several criteria that reveal the existence of non-classical correlations resulting from the quantum character of the spontaneous Hawking radiation (HR). We unify previous general work as applied to HR analogs. We investigate the measurability of the various indicators and conclude that, within a class of detection schemes, only the violation of quadratic Cauchy–Schwarz inequalities can be discerned. We show numerical results that further support the viability of measuring deep quantum correlations in concrete scenarios.engAtribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/journal articlehttp://dx.doi.org/10.1088/1367-2630/17/10/105003http://iopscience.iop.orgopen access538.9AnalogFísica de materialesFísica del estado sólido2211 Física del Estado Sólido