Assisted entanglement distillation

@article{Dutil2011AssistedED,
  title={Assisted entanglement distillation},
  author={Nicolas Dutil and Patrick M. Hayden},
  journal={Quantum Inf. Comput.},
  year={2011},
  volume={11},
  pages={496-520}
}
Motivated by the problem of designing quantum repeaters, we study entanglement distillation between two parties, Alice and Bob, starting from a mixed state and with the help of "repeater" stations. To treat the case of a single repeater, we extend the notion of entanglement of assistance to arbitrary mixed tripartite states and exhibit a protocol, based on a random coding strategy, for extracting pure entanglement. The rates achievable by this protocol formally resemble those achievable if the… 

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