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Multi-photon entangled states of light are key to advancing quantumcommunication, computation, and metrology. Current methods for building suchstates are based on stitching together photons from probabilistic sources. Theprobability of $N$ such sources firing simultaneously decreases exponentiallywith $N$, imposing severe limitations on the practically achievable number ofcoincident photons. We tackle this challenge with a quantum interference buffer(QIB), which combines three functionalities: firstly, it stores polarizationqubits, enabling the use of polarization-entangled states as resource;secondly, it implements entangled-source multiplexing, greatly enhancing theresource-state generation rates; thirdly, it implements time-multiplexed,on-demand linear optical networks for interfering subsequent states. Using theQIB, we multiplex 21 Bell-state sources and demonstrate a nine-fold enhancementin the generation rate of four-photon GHZ states. The enhancement scalesexponentially with the photon number; larger states benefit more strongly.Multiplexed photon entanglement and interference will find diverse applicationsin quantum photonics, allowing for practical realisations of multi-photonprotocols.

Scalable generation of multi-photon entangled states by active feed-forward and multiplexing