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The Einstein-Podolsky-Rosen (EPR) steering is an intermediate quantumnonlocality between entanglement and Bell nonlocality, which plays an importantrole in quantum information processing tasks. In the past few years, theinvestigations concerning EPR steering have been demonstrated in a series ofexperiments. However, these studies rely on the relevant steering inequalitiesand the choices of measurement settings. Here, we experimentally verify the EPRsteering via entanglement detection without using any steering inequality andmeasurement setting. By constructing two new states from a two-qubit targetstate, we observe the EPR steering by detecting the entanglement of these newstates. The results show that the entanglement of the newly constructed statescan be regarded as a new kind of steering witness for target states. Comparedto the results of Xiao et al. [Phys. Rev. Lett. 118, 140404 (2017)], we findthat the ability of detecting EPR steering in our scenario is stronger thantwo-setting projective measurements, which can observe more steerable states.Hence, our demonstrations can deepen the understanding of the connectionbetween the EPR steering and entanglement.

Experimental observation the Einstein-Podolsky-Rosen Steering based on the detection of entanglement