If the many worlds of the Many Worlds Interpretation of quantum mechanics are real, there's at least a good chance that Quantum Immortality is real as well: All conscious beings should expect to experience the next moment in at least one Everett branch even if they stop existing in all other branches, and the moment after that in at least one other branch, and so on forever.
However, the transition from life to death isn't usually a binary change. For most people it happens slowly as your brain and the rest of your body deteriorates, often painfully.
Doesn't it follow that each of us should expect to keep living in this state of constant degradation and suffering for a very, very long time, perhaps forever?
I don't know much about quantum mechanics, so I don't have anything to contribute to this discussion. I'm just terrified, and I'd like, not to be reassured by well-meaning lies, but to know the truth. How likely is it that Quantum Torment is real?
If you're prepared to say you're immortal because even if you die you're still alive in some other branch, it seems like you shouldn't even need quantum mechanics. You're immortal because even if you die, you're still alive in the past.
Sure, but the subjective experience of being my past self will never causally follow from my subjective experience of being the current me, so I don't care.
Put another way, you're talking about timeless immortality. I'm talking about real immortality.