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The light-matter quantum interface that can create quantum-correlations orentanglement between a photon and one atomic collective excitation is afundamental building block for a quantum repeater. The intrinsic limit is thatthe probability of preparing such non-classical atom-photon correlations has tobe kept low in order to suppress multi-excitation. To enhance this probabilitywithout introducing multi-excitation errors, a promising scheme is to applymultimode memories into the interface. Significant progresses have been made intemporal, spectral, and spatial multiplexing memories, but the enhancedprobability for generating the entangled atom-photon pair has not beenexperimentally realized. Here, by using 6 spin-wave-photon entanglementsources, a switching network and feed-forward control, we build a multiplexedlight-matter interface and then demonstrate a ~6-fold (~4-fold) probabilityincrease in generating entangled atom-photon (photon-photon) pairs. Themeasured compositive Bell parameter for the multiplexed interface is 2.49+-0.03combined with a memory lifetime of up to ~60 microseconds.

Spatial multiplexing of atom-photon entanglement sources using feed-forward controls and switching networks