Black Holes as Rubik's Cubes

We propose a unitary toy model of black hole evaporation, in which the entanglement between the interior and exterior degrees of freedom vanishes at late times. Our model possesses the information-free property and satisfies the niceness conditions discussed in the literature. A key feature of the model is that the Hilbert space of black hole internal states contains a vacuum state corresponding to the completely evaporated black hole, which can be reached from any initial state via the Hawking process. Our model suggests a novel quantum cosmological way in which information can get out of an evaporating black hole.

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14 pages, 3 figures

Black Holes in String Theory
Models of Quantum Gravity
Black Holes
String Duality
black hole: evaporation
vacuum state
unitarity
toy model
radiation: Hawking
entropy: entanglement

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