  The ability of quantum devices to preserve or distribute entanglement is
essential in employing quantum technologies. Such ability is described and
guaranteed by the nonentanglement-breaking (nonEB) feature of participating
quantum channels. For quantum information applications relying on entanglement,
the certification of the nonEB feature is thus indispensable in designing,
testing, and benchmarking quantum devices. Here, we develop a direct and
operational approach for the certification of nonEB quantum channels. By
utilizing the prepare-and-measure test, we derive a necessary and sufficient
condition for witnessing nonEB channels, which is applicable in almost all
experimental scenarios. The approach not only unifies and simplifies existing
methods in the standard scenario and the measurement-device-independent
scenario, but also goes further allowing for certifying the nonEB feature in
the semi-device-independent scenario.
