Abstract
Quantum communication networks enable applications ranging from highly secure communica-tion to clock synchronization and distributed quantum computing. Miniaturized, flexible, and cost-efficient resources will be key elements for ensuring the scalability of such networks as they progresstowards large-scale deployed infrastructures. Here, we bring these elements together by combining anon-chip, telecom-wavelength, broadband entangled photon source with industry-grade flexible-gridwavelength division multiplexing techniques, to demonstrate reconfigurable entanglement distribu-tion between up to 8 users in a resource-optimized quantum network topology. As a benchmarkapplication we use quantum key distribution, and show low error and high secret key generationrates across several frequency channels, over both symmetric and asymmetric metropolitan-distanceoptical fibered links and including finite-size effects. By adapting the bandwidth allocation to spe-cific network constraints, we also illustrate the flexible networking capability of our configuration.Together with the potential of our semiconductor source for distributing secret keys over a 60 nmbandwidth with commercial multiplexing technology, these results offer a promising route to thedeployment of scalable quantum network architectures.
