Experimental violation of n-locality in a star quantum network

Davide Poderini, Iris Agresti, Guglielmo Marchese, Emanuele Polino, Taira Giordani, Alessia Suprano, Mauro Valeri, Giorgio Milani, Nicolò Spagnolo, Gonzalo Carvacho, Rafael Chaves and Fabio Sciarrino ()
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Davide Poderini: Sapienza Università di Roma
Iris Agresti: Sapienza Università di Roma
Guglielmo Marchese: Sapienza Università di Roma
Emanuele Polino: Sapienza Università di Roma
Taira Giordani: Sapienza Università di Roma
Alessia Suprano: Sapienza Università di Roma
Mauro Valeri: Sapienza Università di Roma
Giorgio Milani: Sapienza Università di Roma
Nicolò Spagnolo: Sapienza Università di Roma
Gonzalo Carvacho: Sapienza Università di Roma
Rafael Chaves: Federal University of Rio Grande do Norte
Fabio Sciarrino: Sapienza Università di Roma

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract The launch of a satellite capable of distributing entanglement through long distances and the first loophole-free violation of Bell inequalities are milestones indicating a clear path for the establishment of quantum networks. However, nonlocality in networks with independent entanglement sources has only been experimentally verified in simple tripartite networks, via the violation of bilocality inequalities. Here, by using a scalable photonic platform, we implement star-shaped quantum networks consisting of up to five distant nodes and four independent entanglement sources. We exploit this platform to violate the chained n-locality inequality and thus witness, in a device-independent way, the emergence of nonlocal correlations among the nodes of the implemented networks. These results open new perspectives for quantum information processing applications in the relevant regime where the observed correlations are compatible with standard local hidden variable models but are non-classical if the independence of the sources is taken into account.

Date: 2020
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DOI: 10.1038/s41467-020-16189-6

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