Quantum networks are fundamental for communication protocols and their implementation and validation become hard as the network's complexity increases. In this talk, we show the experimental implementation of a hybrid network exploiting different technologies a quantum dot and a nonlinear crystal.
The network is used to share a photonic entangled state among three nodes connected through a 270 m free-space channel and fiber links.
We also demonstrate the non-local behavior of the implemented network through the violation of a Bell-like Inequality. Our results pave the way toward the realization of more complex networks and the implementation of quantum communication protocols in urban environments, leveraging the capabilities of hybrid-photonic technologies.
The prospect of quantum networks is pushing technical advances in entangled photon generation, and different solutions have now the potential to coexist.
After reviewing the development that led to implement entanglement-based quantum key distribution using a quantum dot—a technology motivated by the goal of on-demand operation—in an urban free-space optical link, we present its extension to a three-node quantum network including a source based on spontaneous parametric down conversion. Using separable measurements, we combine intrinsically independent sources to demonstrate a significant violation of a Bell-like inequality associated to nonlocal correlations in a tripartite hybrid network.
Quantum networks play a crucial role for distributed quantum information processing, enabling the establishment of entanglement and quantum communication among distant nodes. Firstly, we use a coherently driven quantum dot to experimentally demonstrate a modified Ekert quantum key distribution protocol with two quantum channel approaches: both a 250-m-long single-mode fiber and in free-space, connecting two buildings within the campus of Sapienza University in Rome. Second, we included an independent SPDC source to construct a hybrid network (quantum dot and SPDC) to violating a suitable non-linear Bell inequality, thus demonstrating the nonlocal behavior of the correlations among the nodes of the network.
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