In a Big World, though, there is no one person who generated those memories. If you can accurately approximate the objective distribution of those people, and draw someone at random from it, that seems as good as resurrection to me. (Assuming quantum immortality/no Death events, and strictly patternist personal identity/causal continuity is unimportant; I see no reason not to assume these, but apparently some disagree.)
If you can accurately approximate the objective distribution of those people, and draw someone at random from it, that seems as good as resurrection to me.
How might we go about doing this? One method I can see is to make a large number of measurements on physical objects/systems correlated with the deceased persons (in the information theoretic sense), then do a full quantum simulation of the universe starting from initial low-entropy conditions, and look for branches that contain systems that match those measurements, then backtrack the simulation a bit to where those persons are still alive.
Is that what you had in mind?
Go see for yourself.
The complete post is quite long and just as good as this quote.