Packet-switching has been widely used in classical fiber networks for better network scalability and efficiency. Recently, we introduced packet-switching as a new paradigm in quantum networking, where quantum payloads are packetized with classical headers to construct hybrid classical-quantum data frames, and the routing decisions are made in a decentralized fashion at individual routers dynamically. While there are tremendous challenges in building a generic packet-switched quantum network, our study shows that it is possible to develop metropolitan size packet-switched quantum key distribution (QKD) networks with today’s technology. This may greatly facilitate the integration of QKD with classical communication networks and accelerate its adoption.
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