A controlled-squeezing toy model of black hole evaporation with quantum back-reaction is unitary, and the initial black hole state can be recovered from the final radiation.
Conditioning on the branch where the black hole has fully evaporated, no horizon exists, and the inside and outside are disentangled
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A Quantum Superposition of Black Hole Evaporation Histories: Recovering Unitarity
A controlled-squeezing toy model of black hole evaporation with quantum back-reaction is unitary, and the initial black hole state can be recovered from the final radiation.