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

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arxiv 2305.14487 v1 pith:PGJ6TUUX submitted 2023-05-23 quant-ph

Jakob Kaltwasser , Joschka Seip , Erik Fitzke , Maximilian Tippmann , Thomas Walther This is my paper · ORCID
classification quant-ph
keywords networksdetectorsdistributionmultiplexingnumberquantumsingle-photontime
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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 a factor of two by using detector time multiplexing (DTM). We implement the DTM scheme for an entanglement-based time-bin protocol and compare QKD results with and without DTM in our QKD network with four users. When small efficiency losses are acceptable, DTM enables cost-effective, scalable implementations of multi-user QKD networks.

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