  We numerically study the distribution of entanglement between the Dutch
cities of Delft and Eindhoven realized with a processing-node quantum repeater
and determine minimal hardware requirements for verifiable blind quantum
computation using color centers and trapped ions. Our results are obtained
considering restrictions imposed by a real-world fiber grid and using detailed
hardware-specific models. By comparing our results to those we would obtain in
idealized settings we show that simplifications lead to a distorted picture of
hardware demands, particularly on memory coherence and photon collection. We
develop general machinery suitable for studying arbitrary processing-node
repeater chains using NetSquid, a discrete-event simulator for quantum
networks. This enables us to include time-dependent noise models and simulate
repeater protocols with cut-offs, including the required classical control
communication. We find minimal hardware requirements by solving an optimization
problem using genetic algorithms on a high-performance-computing cluster. Our
work provides guidance for further experimental progress, and showcases
limitations of studying quantum-repeater requirements in idealized situations.
