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Quantum Key Distribution has become a mature quantum technology that hasoutgrown dedicated links and is ready to be incorporated into the classicalinfrastructure. In this scenario with multiple potential nodes, it is crucialhaving efficient ways to allocate the network resources between all thepotential users. We propose a simple method for routing and wavelengthassignment in wavelength multiplexed networks in which classical and quantumchannels coexist. The proposed heuristics take into account the specificrequirements of quantum key distribution and focus on keeping at bay thecontamination of the quantum channels by photons coming from the classicalsignals by non-linear processes, among others. These heuristics reduce theshared path between classical and quantum channels. We show we can reduce thenumber of quantum key sequences that must be rejected due to excessive errorrates that cannot guarantee security and compare the results to the usualclassical RWA approach.

Routing and wavelength assignment in hybrid networks with classical and quantum signals