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The forthcoming quantum Internet is poised to allow new applications notpossible with the conventional Internet. The ability for both quantum andconventional networking equipment to coexist on the same fiber network wouldgreatly facilitate the deployment and adoption of coming quantum technology.Most quantum networking tasks, like quantum repeaters and the connection ofquantum processors, require nodes for multi-qubit quantum measurements (oftenBell-State measurements), and their real-world coexistence with theconventional Internet has yet to be shown. Here we field deploy an MDI-QKDsystem, containing a Bell-State measurement Node, over the same fiber networkas multiple standard IP data networks, between three nearby cities in theNetherlands. We demonstrate over 10 Gb/s data communication ratessimultaneously with our next-generation QKD system, and estimate 200 GB/s ofclassical data transmission would be easily achievable without significantlyaffecting QKD performance. Moreover, as the network ran autonomously for twoweeks, this shows an important step towards the coexistence and integration ofquantum networking into the existing telecommunication infrastructure.

Deployed MDI-QKD and Bell-State Measurements Coexisting with Standard Internet Data and Networking Equipment