The largest quantum network of Europe in a node: Norte in MadQCI

During its fourth iteration, the Madrid Quantum Network (MadQCI) gathered up to 26 quantum key distribution (QKD) modules in 9 nodes connected by approximately 110 kilometres of fibre optic pairs. These nodes were part of two domains that had to be connected by an border link. It also hosted a co-located network testing a QKD-switched network. The deployment allowed quantum resources of different nature to be distributed and multiple use cases to be tested. This article details a single node in the network, called Norte, to exemplify the network deployment as a whole.