Robert Johanning

Quantum networks require the integration of quantum and coherent signals into the existing fiber infrastructure, to implement entanglement-based quantum key distribution (QKD) over metropolitan distances. Current approaches to this integration rely on spectral multiplexing, consuming bandwidth and imposing limitations to routing and switching. In this work, we present the first experimental demonstration of temporal multiplexing of entangled photons and coherent signals on a single frequency channel using serrodyne modulation. This enables hybrid quantum communication, fully compatible with the existing telecommunication infrastructure and paves the way for efficient hybrid networking and continuous channel monitoring.