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Are there any known deaths due to Quantum suicide experiments? Conversely, are there any known survivals in such experiments? (We should presumably not expect the latter for large odds of death, but just want the question to be complete.)
Not exactly, but related: Hugh Everett's' daughter Elizabeth committed suicide in 1996 and wrote in her suicide note that she's going to a parallel universe to be with her father.
The exact wording is a little more tentative. From Many Worlds of Hugh Everett, pg757 in my Calibre:
(The footnote explains that "don't file me" is a joking reference to how Everett's ashes were apparently kept in a filing cabinet for some time.)
Note that to someone not taking part in the experiment, the odds of the experimenter surviving are the same regardless of quantum immortality.
(At least, as far as I can tell. But this seems to suggest that if someone survives lots of QI experiments, they should update massively in favour of QI, but nobody else should update at all, which seems really weird to me.)
That's what I was trying to say in my parenthetical above.
And yes, anthropics is weird.
It seems like an observer should likewise update in favor of QI in this case. If I know that you have survived many QI experiments, don't I have just as much justification for updating in favor of QI as you do?
No, because from your perspective, me surviving is just as unlikely under QI as under not-QI. If I die on the result of a quantum coinflip, then the universe diverges into two branches. I can only observe the one where I survive, but that doesn't mean it doesn't exist. You're equally likely to observe either of them.
Louis Slotin?
https://en.wikipedia.org/wiki/Louis_Slotin
"accidentally", and it was before the idea had even been thought of (and, in fact, before MWI had been proposed.