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Entanglement swapping (ES) between memory repeater links is critical forestablishing quantum networks via quantum repeaters. So far, ES withatomic-ensemble-based memories has not been achieved. Here, we experimentallydemonstrated ES between two entangled pairs of spin-wave memories viaDuan-Lukin-Cirac-Zoller scheme. With a cloud of cold atoms inserted in acavity, we produce non-classically-correlated spin-wave-photon pairs in 12spatial modes and then prepare two entangled pairs of spin-wave memories via amultiplexed scheme. Via single-photon Bell measurement on retrieved fields fromtwo memories, we project the two remaining memories never entangled previouslyinto an entangled state with the measured concurrence of C = 0.0124(0.003). Thesuccessful probability of ES in our scheme is increased by three times,compared with that in non-multiplexed scheme. Our presented work shows that thegeneration of entanglement (C>0) between the remaining memory ensemblesrequires the average cross-correlation function of the spin-wave-photon pairsto be >30 .

Multiplexed entanglement swapping with atomic-ensemble-based quantum memories in the single excitation regime