Diagnosing steerability of a bipartite state with the non-steering threshold

Xiaohua Wu, Tao Zhou

Published 2019-04-09Version 1

In the present work, it is shown that the averaged fidelity measured for a bipartite state, which has been designed to diagnose whether the state is entangled, can be also applied for demonstrating steering. If the state is unsteerable from Alice to Bob, it can be proved that the averaged fidelity has an upper-bound, named non-steering threshold, and it is just dependent on the measurement performed by Bob. Based on the calculation of the non-steering thresholds, for two-qubit case, several criteria for steering can be obtained.