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Steering is the entanglement-based quantum effect that embodies the "spookyaction at a distance" disliked by Einstein and scrutinized by Einstein,Podolsky, and Rosen. Here we provide a necessary and sufficientcharacterization of steering, based on a quantum information processing task:the discrimination of branches in a quantum evolution, which we dub subchanneldiscrimination. We prove that, for any bipartite steerable state, there areinstances of the quantum subchannel discrimination problem for which this stateallows a correct discrimination with strictly higher probability than inabsence of entanglement, even when measurements are restricted to localmeasurements aided by one-way communication. On the other hand, unsteerablestates are useless in such conditions, even when entangled. We also prove thatthe above steering advantage can be exactly quantified in terms of the steeringrobustness, which is a natural measure of the steerability exhibited by thestate.

Einstein-Podolsky-Rosen steering provides the advantage in entanglement-assisted subchannel discrimination with one-way measurements