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Entanglement without hidden nonlocality

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Vértesi, Tamás
Published in New journal of physics. 2016, vol. 18, no. 11, 113019
Abstract We consider Bell tests in which the distant observers can perform local filtering before testing a Bell inequality. Notably, in this setup, certain entangled states admitting a local hidden variable model in the standard Bell scenario can nevertheless violate a Bell inequality after filtering, displaying so-called hidden nonlocality. Here we ask whether all entangled states can violate a Bell inequality after well-chosen local filtering. We answer this question in the negative by showing that there exist entangled states without hidden nonlocality. Specifically, we prove that some two-qubit Werner states still admit a local hidden variable model after any possible local filtering on a single copy of the state.
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HIRSCH, Flavien et al. Entanglement without hidden nonlocality. In: New journal of physics, 2016, vol. 18, n° 11, p. 113019. doi: 10.1088/1367-2630/18/11/113019 https://archive-ouverte.unige.ch/unige:90700

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Deposited on : 2016-12-21

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