Several years later, in his seminal paper on quantum computing, Deutsch claimed that only the many-worlds interpretation could explain the fabulous increase in speed that quantum computers offered. “The Everett interpretation explains well how the [quantum] computer’s behaviour follows from its having delegated subtasks to copies of itself in other universes,” Deutsch wrote. “When the [quantum] computer succeeds in performing two processor-days of computation, how would the conventional interpretations explain the presence of the correct answer?Where was it computed?”
