The concept of multiple universes, or the multiverse, is a speculative idea in physics and cosmology. While there are various interpretations of quantum mechanics that suggest the existence of multiple universes, it's important to note that these ideas are still theoretical and not yet empirically proven.
Regarding the notion of a "soul" in the context of quantum physics and the multiverse, it's not a concept that can be directly addressed within the scientific framework. The existence and nature of a soul are typically matters of personal belief and philosophy, often associated with religious or spiritual perspectives.
If we consider the hypothetical scenario where the multiverse exists and there are infinite versions of us, the question of whether each version has the same soul is subjective and open to interpretation. Different belief systems and philosophical perspectives offer varying ideas on the nature and continuity of the soul across different versions of ourselves.
When it comes to what happens when an individual dies in the context of the multiverse, it again depends on one's personal beliefs and philosophies. Some may propose that the soul transitions to another version of oneself in a different universe, while others may argue that the concept of a soul doesn't apply in a multiverse framework. Ultimately, this is a deeply philosophical and metaphysical question that lacks a consensus among different schools of thought.