Quantum violation of local causality in urban network with hybrid photonic technologies

• URL: http://arxiv.org/abs/2109.06823v1
• Date: Tue, 14 Sep 2021 17:06:51 GMT
• Title: Quantum violation of local causality in urban network with hybrid photonic technologies
• Authors: Gonzalo Carvacho, Emanuele Roccia, Mauro Valeri, Francesco Basso Basset, Davide Poderini, Claudio Pardo, Emanuele Polino, Lorenzo Carosini, Michele B. Rota, Julia Neuwirth, Saimon F. Covre da Silva, Armando Rastelli, Nicol\`o Spagnolo, Rafael Chaves, Rinaldo Trotta and Fabio Sciarrino
• Abstract summary: Two independent sources using different technologies are used to share photonic entangled state among three nodes connected through a 270 m free-space channel and fiber links. By violating a suitable non-linear Bell inequality, we demonstrate the nonlocal behaviour of the correlations among the nodes of the network. Our results pave the way towards the realization of more complex networks and the implementation of quantum communication protocols in an urban environment.
• Score: 0.5461681605490603
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum networks play a crucial role for distributed quantum information processing, enabling the establishment of entanglement and quantum communication among distant nodes. Fundamentally, networks with independent sources allow for new forms of nonlocality, beyond the paradigmatic Bell's theorem. Here we implement the simplest of such networks -- the bilocality scenario -- in an urban network connecting different buildings with a fully scalable and hybrid approach. Two independent sources using different technologies, respectively a quantum dot and a nonlinear crystal, are used to share photonic entangled state among three nodes connected through a 270 m free-space channel and fiber links. By violating a suitable non-linear Bell inequality, we demonstrate the nonlocal behaviour of the correlations among the nodes of the network. Our results pave the way towards the realization of more complex networks and the implementation of quantum communication protocols in an urban environment, leveraging on the capabilities of hybrid photonic technologies.

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