Black Holes as Rubik's Cubes

Understand

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.