Experimental Space-Division Multiplexed Polarization-Entanglement Distribution through 12 Paths of a Multicore Fiber

The development and wide application of quantum technologies highly depend on the capacity communication channels distributing entanglement. Space-division multiplexing (SDM) enhanced channel capacities in classical telecommunication bears potential to transfer idea using current infrastructure. Here, we demonstrate an SDM polarization-entangled photons over a 411m long 19-core multicore fiber photon pairs through up 12 simultaneously. quality multiplexed is evidenced by high polarization visibility CHSH Bell inequality violation for each pair opposite cores. Our distribution scheme shows stability 24 hours without any active stabilization can be effortlessly adapted higher number channels. This technique increases quantum-channel allows reliable implementation networks multiple users based single entangled-photon source.