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We discuss the black hole information problem, including the recent claimthat unitarity requires a horizon firewall, emphasizing the role of decoherenceand macroscopic superpositions. We consider the formation and evaporation of alarge black hole as a quantum amplitude, and note that during intermediatestages (e.g., after the Page time), the amplitude is a superposition ofmacroscopically distinct (and decohered) spacetimes, with the black hole itselfin different positions on different branches. Small but semiclassical observers(who are themselves part of the quantum amplitude) that fall into the hole onone branch will miss it entirely on other branches and instead reach futureinfinity. This observation can reconcile the subjective experience of aninfalling observer with unitarity. We also discuss implications for the niceslice formulation of the information problem, and to complementarity.

Macroscopic superpositions and black hole unitarity