Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms14775
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Funding
- ERC-Starting Grant 3D-QUEST (3D-Quantum Integrated Optical Simulation) [307783]
- Becas Chile
- Conicyt
- Excellence Initiative of the German Federal and State Governments [ZUK 43, 81]
- FQXi Fund
- US Army Research Office [W911NF-14-1-0098, W911NF-14-1-0133]
- DFG [GRO 4334, SPP 1798]
- MEC
- MCTIC
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Bell's theorem plays a crucial role in quantum information processing and thus several experimental investigations of Bell inequalities violations have been carried out over the years. Despite their fundamental relevance, however, previous experiments did not consider an ingredient of relevance for quantum networks: the fact that correlations between distant parties are mediated by several, typically independent sources. Here, using a photonic setup, we investigate a quantum network consisting of three spatially separated nodes whose correlations are mediated by two distinct sources. This scenario allows for the emergence of the so-called non-bilocal correlations, incompatible with any local model involving two independent hidden variables. We experimentally witness the emergence of this kind of quantum correlations by violating a Bell-like inequality under the fair-sampling assumption. Our results provide a proof-of-principle experiment of generalizations of Bell's theorem for networks, which could represent a potential resource for quantum communication protocols.
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