Jing-Ling Chen, Xiang-Jun Ye, Chunfeng Wu, Hong-Yi Su, Adan Cabello, L. C. Kwek, C. H. Oh
We show that, for any two-qubit state, quantum steering can be proven without testing the violation of steering inequalities. We show that steerability is proven if Bob's normalized conditional states after Alice's measurements are pure. This method, which may be seen as the quantum steering analog of Greenberger-Horne-Zeilinger-like tests of Bell nonlocality without Bell inequalities, offers advantages with respect to the existing methods for experimentally testing quantum steering.
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http://arxiv.org/abs/1204.1870
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