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Quantum Entanglement & Spooky Action at a Distance

Veritasium · 4.5M views · 2015-01-12 · 9:16

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Overview

Veritasium explains quantum entanglement and spooky action at a distance, walking through Bell's inequality and the experiments that rule out hidden variables, in under ten minutes.

On Hacker News

HN recommends it as one of the clearest layman explanations of Bell's theorem.

Recommended by 9 HN people across 9 months · HN mentions 2015–2022

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What people said

gibybo · 2015-11 · Strong recommendation

Check out [VIDEO] It's my favorite video for explaining how we know that the state is not determined until it has been measured. It's not just a decision we thought up on paper. It is real and well proven.

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slaxman · 2015-09 · Strong recommendation

I can't recommend Veritasium and CGP Grey enough. They are amazing YouTube Channels! Check out this video where Veritasium explains Quantum Entanglement. [VIDEO] It amazes me how he explains something so difficult in less than 10 minutes!

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GolDDranks · 2022-10 · Recommendation

You understood correctly that quantum mechanics cannot be based on some hidden variable we haven't or cannot find. (Edit: oops, I re-read your comment and it seems you say the exact opposite thing? The point is that Bell's theorem rules hidden variables OUT. Here's an easily digestible video about this: [VIDEO] ) About probability: no one knows. It might be that there is a "wave function collapse" that has a probabilistic outcome. But it might be that there is no such a thing. Quantum mechanics that remain in the "quantum" realm are not probabilistic, it's only when you cross over to the classical world. So it might be equally well, that the Everett interpretation (so-called "many worlds interpretation") is true, and the probability is something physicist Sean Carroll calls "self-locating uncertainty": [LINK] That is, there are multiple "yous" that experience different outcomes, and you don't know which branch of the wavefunction you find "yourself" in, which "you" you are.

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Sources

Video by Veritasium, played through YouTube.

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