Why Quantum Information is Never Destroyed | Space Time
techstepgenr8tion
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Conservation of information?! I'm a bit shocked PBS would put it that way. The idea sounds like it's tightly bound to a handful of interpretations and there are at least a few theories that either partially or even fully negate this idea. Still, I never thought I'd hear the words 'conservation of information' coming out of Matt O'Dowd, sounds a bit... Chopraesque of them.
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“Love takes off the masks that we fear we cannot live without and know we cannot live within. I use the word "love" here not merely in the personal sense but as a state of being, or a state of grace - not in the infantile American sense of being made happy but in the tough and universal sense of quest and daring and growth.” - James Baldwin
"Conservation of information" means that the wave function at any one moment in time could be reconstructed in principle from the wave function at any other moment in time, and is a trivial logical consequence of unitarity. As some interpretations (like Many Worlds theory) reject any non-unitary time evolution of the wave function (namely, wave function collapse), "conservation of information" would be a fundamental part of those interpretations.
techstepgenr8tion
Veteran
Joined: 6 Feb 2005
Age: 44
Gender: Male
Posts: 24,194
Location: 28th Path of Tzaddi
Yeah, that's pretty much exactly how they explained it in the video - that with the models under consideration a given state could not/would not be arrived at from multiple prior states. A person has to perhaps understand as well that they don't mean approximate states, the way we'd typically think of water for example being able to hit any side of a funnel and go down the center and out the bottom, but rather exact particle-per-particle placement and motion across time.
_________________
“Love takes off the masks that we fear we cannot live without and know we cannot live within. I use the word "love" here not merely in the personal sense but as a state of being, or a state of grace - not in the infantile American sense of being made happy but in the tough and universal sense of quest and daring and growth.” - James Baldwin
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