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Current quantum key distribution (QKD) networks focus almost exclusively ontransporting secret keys with the highest possible rate. Consequently, they arebuilt as mostly fixed, ad hoc, logically, and physically isolatedinfrastructures designed to avoid any penalty to the quantum channel. Thisarchitecture is neither scalable nor cost-effective and future, real-worlddeployments will differ considerably. The structure of the MadQCI QKD networkpresented here is based on disaggregated components and modern paradigmsespecially designed for flexibility, upgradability, and facilitating theintegration of QKD in the security and telecommunications-networks ecosystem.These underlying ideas have been tested by deploying many QKD systems fromseveral manufacturers in a real-world, multi-tenant telecommunications network,installed in production facilities and sharing the infrastructure withcommercial traffic. Different technologies have been used in different links toaddress the variety of situations and needs that arise in real networks,exploring a wide range of possibilities. Finally, a set of realistic use caseshave been implemented to demonstrate the validity and performance of thenetwork. The testing took place during a period close to three years, wheremost of the nodes were continuously active.

MadQCI: a heterogeneous and scalable SDN QKD network deployed in production facilities