Entanglement activation and the robustness of quantum correlations

@article{Brando2007EntanglementAA,
  title={Entanglement activation and the robustness of quantum correlations},
  author={Fernando G. S. L. Brand{\~a}o},
  journal={Physical Review A},
  year={2007},
  volume={76},
  pages={030301}
}
  • F. Brandão
  • Published 12 October 2005
  • Physics
  • Physical Review A
We show that the usefulness of a state as an activator in teleportation protocols is equivalent to the robustness of its entanglement to noise. The robustness of entanglement of a bipartite state σ is linked to the maximum increase in the fidelity of teleportation of any other state when σ is used as an extra resource. On the one hand, this connection gives an operational meaning to the robustness of entanglement. On the other hand, it shows that the activation capability-which has a central… 

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