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Genuine Hidden Quantum Nonlocality

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Published in Physical Review Letters. 2013, vol. 111, no. 16
Abstract The nonlocality of certain quantum states can be revealed by using local filters before performing a standard Bell test. This phenomenon, known as hidden nonlocality, has been so far demonstrated only for a restricted class of measurements, namely projective measurements. Here we prove the existence of genuine hidden nonlocality. Specifically, we present a class of two-qubit entangled states, for which we construct a local model for the most general local measurements (POVMs), and show that the states violate a Bell inequality after local filtering. Hence there exist entangled states, the nonlocality of which can be revealed only by using a sequence of measurements. Finally, we show that genuine hidden nonlocality can be maximal. There exist entangled states for which a sequence of measurements can lead to maximal violation of a Bell inequality, while the statistics of non-sequential measurements is always local.
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HIRSCH, Flavien et al. Genuine Hidden Quantum Nonlocality. In: Physical Review Letters, 2013, vol. 111, n° 16. https://archive-ouverte.unige.ch/unige:36410

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Deposited on : 2014-05-06

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