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We investigate quantum repeaters in the context of quantum key distribution.We optimize the secret key rate per memory per second with respect to differentdistillation protocols and distillation strategies. For this purpose, we alsoderive an analytical expression for the average number of entangled pairscreated by the quantum repeater, including classical communication times forentanglement swapping and entanglement distillation. We investigate the impactof this classical communication time on the secret key rate. We finally studythe effect of the detector efficiency on the secret key rate.

Quantum repeaters and quantum key distribution: the impact of entanglement distillation on the secret key rate