Black holes as mirrors: Quantum information in random subsystems

  title={Black holes as mirrors: Quantum information in random subsystems},
  author={Patrick M. Hayden and John Preskill},
  journal={Journal of High Energy Physics},
We study information retrieval from evaporating black holes, assuming that the internal dynamics of a black hole is unitary and rapidly mixing, and assuming that the retriever has unlimited control over the emitted Hawking radiation. If the evaporation of the black hole has already proceeded past the ``half-way'' point, where half of the initial entropy has been radiated away, then additional quantum information deposited in the black hole is revealed in the Hawking radiation very rapidly… 

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