Experimental demonstration of nonbilocal quantum correlations

Science Advances
Dylan J SaundersGeoff J Pryde

Abstract

Quantum mechanics admits correlations that cannot be explained by local realistic models. The most studied models are the standard local hidden variable models, which satisfy the well-known Bell inequalities. To date, most works have focused on bipartite entangled systems. We consider correlations between three parties connected via two independent entangled states. We investigate the new type of so-called "bilocal" models, which correspondingly involve two independent hidden variables. These models describe scenarios that naturally arise in quantum networks, where several independent entanglement sources are used. Using photonic qubits, we build such a linear three-node quantum network and demonstrate nonbilocal correlations by violating a Bell-like inequality tailored for bilocal models. Furthermore, we show that the demonstration of nonbilocality is more noise-tolerant than that of standard Bell nonlocality in our three-party quantum network.

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Citations

Apr 26, 2018·Physical Review Letters·Ming-Xing Luo
Jun 30, 2018·Physical Review Letters·Jun GaoXian-Min Jin
Jun 8, 2019·Physical Review Letters·Askery CanabarroRafael Chaves
Apr 13, 2019·Physical Review Letters·Stefania SciaraRoberto Morandotti
Nov 26, 2019·Physical Review Letters·Chao ZhangGerardo Adesso
May 20, 2020·Nature Communications·Davide PoderiniFabio Sciarrino
Sep 26, 2020·Physical Review Letters·Johan ÅbergRafael Chaves
Mar 28, 2021·Optics Express·Guilherme Luiz ZaninPhilip Walther
Dec 17, 2021·Nature·Marc-Olivier RenouMiguel Navascués

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