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We demonstrate a method to reduce the number of single-photon detectors(SPDs) required in multi-party quantum key distribution (QKD) networks by afactor of two by using detector time multiplexing (DTM). We implement the DTMscheme for an entanglement-based time-bin protocol and compare QKD results withand without DTM in our QKD network with four users. When small efficiencylosses are acceptable, DTM enables cost-effective, scalable implementations ofmulti-user QKD networks.

Reducing the number of single-photon detectors in quantum key distribution networks by time multiplexing