Experimental EPR-Steering of Bell-local States - Quantum PhysicsReport as inadecuate

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Abstract: Entanglement is the defining feature of quantum mechanics, and understandingthe phenomenon is essential at the foundational level and for future progressin quantum technology. The concept of steering was introduced in 1935 bySchr\-odinger as a generalization of the Einstein-Podolsky-Rosen EPR paradox.Surprisingly, it has only recently been formalized as a quantum informationtask with arbitrary bipartite states and measurements, for which the existenceof entanglement is necessary but not sufficient. Previous experiments in thisarea have been restricted to the approach of Reid PRA 40, 913, which followedthe original EPR argument in considering only two different measurementsettings per side. Here we implement more than two settings so as to be able todemonstrate experimentally, for the first time, that EPR-steering occurs formixed entangled states that are Bell-local that is, which cannot possiblydemonstrate Bell-nonlocality. Unlike the case of Bell inequalities, increasingthe number of measurement settings beyond two-we use up to six-dramaticallyincreases the robustness of the EPR-steering phenomenon to noise.

Author: D. J. Saunders 1 and 2, S. J. Jones 1 and 2, H. M. Wiseman 1 and 2, G. J. Pryde 1 and 2 1 Centre for Quantum Dynamics, Griffith U

Source: https://arxiv.org/

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