Question

What do you mean by the theory of "Quantum Immortality"??

Answer 1

No, "quantum immortality" is NOT the idea that, according to quantum mechanics, we are somehow "immortal". Quantum mechanics is a mathematical model describing the probabilistic behavior of subatomic particles, and it has absolutely nothing to say about the life and death of humans. "Quantum immortality" is simply a very poorly named result of a particular thought experiment.



What are quantum suicide and quantum immortality?

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Barak Shoshany, Graduate Student at Perimeter Institute for Theoretical Physics

Updated Jun 27, 2015 · Upvoted by Arets Paeglis, MSci Physics with Theoretical Physics at ICL and Patrick Hochstenbach, Master Theoretical Physics, Radboud University, the Netherl…

Before I begin answering this question, let me write an extremely important clarification in bold:



Quantum suicide is a thought experiment that was suggested as a way to determine experimentally, at least in principle, whether the many-worlds interpretation of quantum mechanics is correct. (To be absolutely clear, this is not a real experiment that should actually be performed by anyone, it's just a thought experiment!)

According to the many-worlds interpretation, whenever a quantum measurement is performed, all results of the measurement are actually measured, but in different "branches" of the wavefunction (sometimes interpreted as "parallel universes" although that is not entirely true; there is still only one universe).

So if a measurement can result in either A or B with 50% probability each, the person who made the measurement is also "branched" into two different "states": one state in which the person measured A and one state in which the person measured B, with 50% probability each.

Now, the thought experiment goes like this: An experimenter stands in a box with a quantum measurement device. The quantum measurement can result in either A or B with 50% probability each. This measurement is performed every second. If A was measured, nothing happens. But if B was measured, a nuclear explosion immediately disintegrates the entire box including the experimenter inside.

Answer 2

Quantum Immortality is an idea in which it is put forward that the consciousness stays alive even though the conscious being dies. For example, someone sets off a bomb beside the victim, that victim survives in an alternate universe by being injured but living, or by the bomb not blowing up. However, in the original universe, the victim "dies" in the blast. The consciousness continues to exist in another, perhaps many alternate universes.