Scientific article
Open access

Genuine Hidden Quantum Nonlocality

Published inPhysical review letters, vol. 111, no. 16
Publication date2013

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.

Citation (ISO format)
HIRSCH, Flavien et al. Genuine Hidden Quantum Nonlocality. In: Physical review letters, 2013, vol. 111, n° 16. doi: 10.1103/PhysRevLett.111.160402
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Article (Published version)
ISSN of the journal0031-9007

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