While I do still find myself quite uncertain about the concept of 'quantum immortality', not to mention the even stronger implications of certain multiverse theories, these don't seem to be the kind of thing that you're talking about. I submit that 'there is an extant structure not found within our best current models of reality isomorphic to a very specific (and complex) type of computation on a very specific (and complex) set of data (ie your memories and anything else that comprises your 'identity')' is not a simple proposition.