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The development and wide application of quantum technologies highly depend onthe capacity of the communication channels distributing entanglement.Space-division multiplexing (SDM) enhanced channel capacities in classicaltelecommunication and bears the potential to transfer the idea to quantumcommunication using current infrastructure. Here, we demonstrate an SDM ofpolarization-entangled photons over a 411m long 19-core multicore fiberdistributing polarization-entangled photon pairs through up to 12 channelssimultaneously. The quality of the multiplexed transfer is evidenced by highpolarization visibility and CHSH Bell inequality violation for each pair ofopposite cores. Our distribution scheme shows high stability over 24 hourswithout any active polarization stabilization and can be effortlessly adaptedto a higher number of channels. This technique increases the quantum-channelcapacity and allows the reliable implementation of quantum networks of multipleusers based on a single entangled-photon pair source.

Experimental space-division multiplexed polarization-entanglement distribution through 12 paths of a multicore fiber