quantum mechanics
The theory itself and the arguments about what it means -- measurement, collapse, and whether nature is locally causal.
FilterEveryone, all time
- TT
Terence Tao quoted
Their wordsBut I have faith that we've been doing this for centuries and we've made progress before. There's no reason why we should stop.
↗Terence Tao: Hardest Problems in Mathematics, Physics & the Future of AI | Lex Fridman Podcast #472youtube.com 3rd of 20 in this recording
- 6 weeks earlier
- JL
Janna Levin quoted
Their wordsI’m unhappy with that. I would not be happy with information loss. I love that it’s telling us that there’s this crisis because I do think it’s giving us the clues, and we have to take them seriously.
↗Janna Levin: Black Holes, Wormholes, Aliens, Paradoxes & Extra Dimensions | Lex Fridman Podcast #468youtube.com 11th of 24 in this recording
- 3 months earlier
- NL
Nathan Lambert quoted
Their wordsThere's not many worlds where China cannot train AI models. I think export controls are decapping the amount of compute or the density of compute that China can have.
↗DeepSeek, China, OpenAI, NVIDIA, xAI, TSMC, Stargate, and AI Megaclusters | Lex Fridman Podcast #459youtube.com 6th of 44 in this recording
- 6 weeks earlier
- AF
Adam Frank quoted
Their wordsMany of them try to pretend the measurement problem isn't there. Go to enormous lengths like the many-worlds interpretation, literally inventing an infinite number of unobservable parallel universes to avoid the thing that quantum mechanics is telling them, which is that measurements matter.
↗Adam Frank: Alien Civilizations and the Search for Extraterrestrial Life | Lex Fridman Podcast #455youtube.com 23rd of 24 in this recording
- 6 months earlier
- SW
Sara Walker quoted
Their wordsSo my interpretation of reality is if you fold it up, all that bifurcation of many worlds, and you just fold it into the structure that is you, and you just said you are all of those many worlds and your history converged on you, but you’re actually an object exists that was selected to exist, and you’re self-consistent with the other structures. So the quantum mechanical reality is not the one that you live in. It’s this very deterministic, classical world, and you’re carving a path through that space. But I don’t think that you’re constantly branching into new spaces. I think you are that space.
↗Sara Walker: Physics of Life, Time, Complexity, and Aliens | Lex Fridman Podcast #433youtube.com 21st of 22 in this recording
- 7 weeks earlier
- SC
Sean Carroll quoted
Their wordsI think that that story about the latter part is completely wrong, almost 180 degrees wrong. I think that Einstein understood quantum mechanics as well as anyone, at least up through the 1930s. I think that his philosophical objections to it are correct. He should actually have been taken much more seriously about that.
↗Sean Carroll: General Relativity, Quantum Mechanics, Black Holes & Aliens | Lex Fridman Podcast #428youtube.com 1st of 20 in this recording
- SC
Sean Carroll quoted
Their wordsIf you think about how we teach quantum mechanics to our students, the Copenhagen interpretation, it’s a God-awful mess. No one’s going to accuse that of being very beautiful. I’m a fan of the many-worlds interpretation of quantum mechanics, and that is very beautiful in the sense that fewer ingredients, just one equation, and it could cover everything in the world.
↗Sean Carroll: General Relativity, Quantum Mechanics, Black Holes & Aliens | Lex Fridman Podcast #428youtube.com 7th of 20 in this recording
- 7 months earlier
- SH
Sabine Hossenfelder quoted
Their wordsThe Copenhagen Model-and because of that, the Copenhagen Interpretation-is not locally causal in Bell's sense.
↗Quantum Confusions, Cleared Up (or so I hope)arxiv.org 1st of 4 in this piece
- SH
Sabine Hossenfelder quoted
Their wordsSince Local Causality is a property of a model, observing violations of Bell's inequality cannot tell us anything about nature itself, but merely about the properties of the model that we use to describe nature.
↗Quantum Confusions, Cleared Up (or so I hope)arxiv.org 2nd of 4 in this piece
- SH
Sabine Hossenfelder quoted
Their wordswhile decoherence has the potential to solve this aspect of the measurement problem, it hasn't yet been satisfactorily done. Decoherence also certainly does not return us to Local Causality.
↗Quantum Confusions, Cleared Up (or so I hope)arxiv.org 3rd of 4 in this piece
- SH
Sabine Hossenfelder quoted
Our readingThe collapse postulate cannot simply be discarded without replacement instructions for measurements.
Their wordsAs we just saw, one cannot just discard the Collapse Postulate. For this reason, if one does calculations in any Many Worlds approach, one must effectively replace the Collapse Postulate by other assumptions, notably about what happens to observers and/or measurement devices when worlds branch.
↗Quantum Confusions, Cleared Up (or so I hope)arxiv.org 4th of 4 in this piece