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Bipartite Bell inequalities with three ternary-outcome measurements – from theory to experiments. (English) Zbl 1456.81029

New J. Phys. 18, No. 3, Article ID 035001, 19 p. (2016); corrigendum ibid. 20, No. 4, Article ID 049502, 1 p. (2018).
Summary: We explore quantum nonlocality in one of the simplest bipartite scenarios. Several new facet-defining Bell inequalities for the \(\{[3\;3\;3]\;[3\;3\;3]\}\) scenario are obtained with their quantum violations analyzed in details. Surprisingly, all these inequalities involving only genuine ternary-outcome measurements can be violated maximally by some two-qubit entangled states, such as the maximally entangled two-qubit state. This gives further evidence that in analyzing the quantum violation of Bell inequalities, or in the application of the latter to device-independent quantum information processing tasks, the commonly held wisdom of equating the local Hilbert space dimension of the optimal state with the number of measurement outcomes is not necessarily justifiable. In addition, when restricted to the minimal qubit subspace, it can be shown that one of these Bell inequalities requires non-projective measurements to attain maximal quantum violation, thereby giving the first example of a facet-defining Bell inequality where a genuine positive-operator-valued measure is relevant. We experimentally demonstrate the quantum violation of this and two other Bell inequalities for this scenario using energy-time entangled photon pairs. Using the obtained measurement statistics, we demonstrate how characterization of the underlying resource in the spirit of device-independence, but supplemented with auxiliary assumptions, can be achieved. In particular, we discuss how one may get around the fact that, due to finite-size effects, raw measurement statistics typically violate the non-signaling condition.

MSC:

81P15 Quantum measurement theory, state operations, state preparations
81P13 Contextuality in quantum theory
81P05 General and philosophical questions in quantum theory

References:

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