I had assumed that microscopic reversibility and a large set of measurements were all that was required. Could you explain where my assumption is wrong ?
Quantum mechanics (in any interpretation, not just many-worlds) makes this impossible even in principle; the necessary information can’t be retrieved, and may not even be present in any one quantum outcome. Even under classical mechanics, you need exact measurements of essentially the whole universe, including photons on their way to infinity, meaning that you need sensors and computers that are larger than and outside of the universe.
I had assumed that microscopic reversibility and a large set of measurements were all that was required. Could you explain where my assumption is wrong ?
Quantum mechanics (in any interpretation, not just many-worlds) makes this impossible even in principle; the necessary information can’t be retrieved, and may not even be present in any one quantum outcome. Even under classical mechanics, you need exact measurements of essentially the whole universe, including photons on their way to infinity, meaning that you need sensors and computers that are larger than and outside of the universe.