minutephysics
8 HN recommenders · recommended in 15 months, 2019–2024
17:35 · 8.1M views · Sep 13, 2017
MinutePhysics, with 3Blue1Brown, explains Bell's theorem using a Venn diagram paradox and polarizing filters. It shows why no local hidden variable theory can reproduce quantum correlations.
Repeatedly recommended as the most accessible explanation of Bell's inequality, reducing it to a simple counting problem.
19 comments from Hacker News
> Are you saying an omniscient being is impossible, because something about quantum mechanics implies that it is impossible to possess all possible knowledge? > Or are you saying that even if an omniscient being possesses all possible knowledge, they would nevertheless be unable to accurately predict all sequences because of some knowledge we have about quantum mechanics? That's an extremely astute question. I'm impressed that you managed to realize that that's an important distinction and that you don't know which it is. It's actually the latter, and incredibly we can prove it. And the proof of this is surprisingly accessible: this video
Why Quantum Mechanics I have no idea. Why interpretations: There is an experiment you can do that is hard to explain: Either particles are able to somehow influence each other faster than light (non-local), or the particle somehow doesn't exist except when interacting with some other particle (non-real). Try this video: this video the AHA moment in the video comes when you realize you can entangle the light and that adding a filter by one stream of light somehow causes the other stream of light to also be influenced.
My goal wasn't to explain a "correct" view quantum physics, only to demonstrate at a cursory level that a binary computer's bits differs from a quantum computer's qbits. Quantum physics is not intuitive and attempting to use a classical understanding of probability will get you in trouble. I highly suggest looking at videos on YouTube, which have a far better explanations on the actual behavior of quantum computation. This is a very good video on Bell's Inequality: this video
I really enjoyed this Minute Physics and 3Blue1Brown video describing hidden variables and Bell's theorem: this video As you said, it's implies that we're not failing to measure some "hidden variable" that would explain probabilities away, but that the vary nature of these objects is probabilistic.
I found these two videos very helpful in understanding the quantum nature of light after being stuck in the same spot: this video [LINK] (Watch those in order, because they're a collaboration between two YouTubers)