Revisiting the Black Hole Entropy and the Information Paradox

Figure 1

(a) The Penrose diagram of black hole evaporation, depicting Alice and Bob and their past lightcones. (b) The Penrose diagram of a backwards in time observer Charlie, depicting how he observes Alice and Bob, and the quantum information each of them caries, even if this information is cloned, therefore disclosing a violation of quantum theory.

(a)

(b)