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992,305 Views • Jul 8, 2023 • Click to toggle off description
Last year, the Nobel Prize in physics was awarded to three physicists who allegedly found that the universe is not locally real. But what does this mean? What are the two types of non-locality? And what did Einstein's have to do with it? That's what we'll talk about today.
Some examples for models that violate measurement independence are here:
C. H. Brans, International Journal of Theoretical Physics 27, 219 (1988)
link.springer.com/article/10.1007/BF00670750
T. N. Palmer, Proc. Roy. Soc. A, 451, 585-608 (1995)
arxiv.org/abs/quant-ph/9505025
J. Degorre, S. Laplante, J. Roland, PRA 72, 062314 (2005)
arxiv.org/abs/quant-ph/0507120
M. J. W. Hall, Phys. Rev. Lett. 105, 250404 (2010)
arxiv.org/abs/1007.5518
G. S. Ciepielewski, E. Okon, D. Sudarsky
arxiv.org/abs/2008.00631
S. Donadi, S. Hossenfelder, PRA 106, 2 (2022)
arxiv.org/abs/2010.01327
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00:00 Introduction
00:39 Two types of Non-Locality
05:32 Quantum Mechanics
12:32 Local Causality
16:34 Measurement Independence
19:55 Bell's Theorem
22:39 Summary
23:32 Brilliant Sponsorship
#science #physics #quantum
Views : 992,305
Genre: Science & Technology
Date of upload: Jul 8, 2023 ^^
Rating : 4.942 (497/33,503 LTDR)
RYD date created : 2024-05-18T02:20:50.154721Z
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YouTube Comments - 3,797 Comments
Top Comments of this video!! :3
When Sabine said, “You’ve already watched 20 videos on Bell’s theorem and they didn’t help,” I felt that.
731 |
Quantum mechanics and Artificial Intelligence is being taught to the general public by journalists. It's no wonder it seems like no one understands either.
39 |
I usually only understand about 50% of deep physics, but I like that your videos help nudge that percentage up to 50.1% with a 0.1% error margin either way.
549 |
I never thought i could be capable of both understanding something and completely not understanding that very thing at the same time.
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For all the math people out there, locality is sort of the physics version of the Intermediate Value Theorem, which states that for a continuous graph, if it passes through point A and B with coordinates (x1, y1) and (x2, y2), respectively, the graph has to go through every point in between. So locality is if the the graph is continuous and non-locality is if the graph is non-continuous, meaning it doesn’t have to pass through any of the points in between
274 |
I've a Ph.D. in physics, and this is the best explanation of Bell's Inequality I've seen.
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Listening to Sabine I wish I could forget all the incorrect information I have listened to in my 70 years. Conditioning is a real problem as your brain keeps going back to the old patterns. Thanks for the videos. I am slowly getting a better picture…. from a person with an Arts degree. Love the dry humour as well🇨🇦
35 |
This makes me feel more intelligent because it convinced me that if I only put a little more effort into it I would be able to understand it all. Obviously I’m not going to put that theory to the test
343 |
This was some of your best work Sabine! Apparently making peoples brains hurt and making them laugh at the same time is just what science education needs. Why the Profs thought they could be dry as an old biscuit and expect people to listen has always been beyond me?? I would've gone to your lectures instead of reading the book. That's a big statement as the book has all the knowledge you need and doesn't expect you to get out of bed or even wear pants!
218 |
Thank you Sabine. I didn’t manage to follow the whole video, but your explanations of wave functions, collapse of wave functions, and entanglement were the most accessible that I have seen or read. They really improved my understanding. 🙏
3 |
I really appreciate these videos. I admire how much patience you have to teach us.
5 |
Sabine’s dry humor is hilarious and makes learning complicated physics much more fun. Existential Physics is an awesome book for the same reason.
468 |
The ideas of explaining non-locality with portals, the lightcone, the graphics and the entry and exit arrows are magnificient.
193 |
The "collapse" of a wave function is simply the terminology used to describe that the equation describing the probabilities of the wave function has been updated to reflect out observations. That explanation was very helpful.
80 |
Very nice video, even though I feel it goes over my head at some points. But trying to explain something complicated to us watchers is very much appreciated Sabine!
9 |
This is one of Sabine's best videos to date. It is an important concept to help refute the "quantum woo" that has become part of our popular culture.
403 |
19:55 Sabine calling out her own audience absolutely slays me & I'm soooo glad to be here for it 🤣
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This was great for me thanks. I studied physics at uni, so was already familiar with the topic. Love your witty, to the point explanations, cheers!
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0:00: 🌍 The video discusses the concept of locality and its connection to quantum mechanics.
3:32: ! The example of the two envelopes with correlated numbers demonstrates non-local descriptions of reality.
7:18: 🔬 Quantum mechanics is non-local in nature and the wave function may describe knowledge rather than reality.
18:53: ✅ In quantum mechanics, a photon can take two paths and interfere with itself, but measuring the path requires non-local collapse.
11:25: 🔬 Quantum entanglement does not allow for faster-than-light communication.
15:04: 🔍 The video discusses the non-local causality in quantum mechanics.
22:19: 🔬 The video discusses the non-locality of quantum mechanics and the concept of superdeterminism.
Recap by Tam
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@luudest
10 months ago
The guys who proved the violation of Bell‘s inequality won the No-Bell Prize 😂
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