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Quantum networking relies on entanglement distribution between distant nodes,typically realized by swapping procedures. However, entanglement swapping is ademanding task in practice, mainly because of limited effectiveness ofentangled photon sources and Bell-state measurements necessary to realize theprocess. Here we experimentally activate a remote distribution of two-photonpolarization entanglement superseding the need for initial entangled pairs andtraditional Bell-state measurements. This alternative procedure is accomplishedthanks to the controlled spatial indistinguishability of four independentphotons in three separated nodes of the network, which enables us to performlocalized product-state measurements in the central node acting as a trigger.This experiment proves that the inherent indistinguishability of identicalparticles supplies new standards for feasible quantum communication inmultinode photonic quantum networks.

Remote entanglement distribution in a quantum network via multinode indistinguishability of photons