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.
Quantum Fields in Curved Space,
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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.