Quantum Theory of the Classical ▸ KITP Public Lecture by Wojciech Zurek
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- čas přidán 29. 05. 2019
- Why does quantum theory result in a familiar “classical reality” in quantum systems? How and why does quantum theory result in our classical perceptions?
We live in a Universe that is fundamentally quantum. Yet, our everyday world appears to be resolutely classical. The underlying quantumness of our Universe has been by now convincingly established by careful laboratory experiments. They attest to the quantum nature of systems of various size and, above all, of the “stuff” (e.g. atoms) everything is made of. The evidence for the absence of quantumness in our world comes from ongoing everyday “experiments” - our perceptions - that are poorly controlled, but, because of their immediate, personal nature, are immensely persuasive.
Wojciech Hubert Zurek is a Laboratory Fellow at Los Alamos. He is a leading authority on quantum theory, especially decoherence and the physics of information. His work on decoherence established a major bridge between the quantum and the classical, and the no- cloning theorem is the cornerstone of quantum information theory. Zurek is a Fellow of the American Physical Society, served as the Einstein Professor at the Ulm University, and received the Los Alamos Medal in 2014, the highest honor bestowed by the Los Alamos National Laboratory.
Public Lecture Series sponsored by Friends of KITP
May 29, 2019
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Wow! He blew my mind. I always had problem understanding the whole mechanism of this idea that a superposition reality (quantum world) creates a “visible to us” probabilistic mix. He made me understand it. Perfectly actually. “You see me and you interact with me through environment” is a fantastic example of his view.
Brilliant man.
Thank you so much for uploading this.
Let me go science fiction: I wonder if is it possible for a conscious being, like humans, to evolve in such a way that their “objective reality” coming from the same quantum world as us, differs from our (humans) current “objective reality”? Or if the environment is the same, the “reality” is going to be same?! But again, humans themselves are a product of the environment! Weird!
Here is my amateur understanding of why we normally experience "classical physics" in our daily lives, rather than "quantum physics". Basically, in quantum mechanics, when a particle is first observed at point-A and later observed at point-B, it theoretically travels along every possible path from point-A to point-B. However, there is a probability associated with each possible path. At the scale of our daily experience, the path according to "classical physics" has a vastly greater probability than any other path from point-A to point-B. It is primarily at extremely small sizes, perhaps smaller than an atom, that the probability of non-classical paths become significant. Richard Feynman's "5 Easy Pieces" or his "Another 5 Easy Pieces" books talk about these ideas.
I'd love something on suez
Great to hear European voices. Thanks very informative
Great lecture
@Astute Cingulus why did you do this?
fantastic
Excellent!
thank you for this great talk! I have the following question: How come the environment can make multiple copies of the system? I thought information cannot be copied in quantum mechanics
An unknown state cannot be perfectly copied in QM. We can have imperfect ones what actually environment gives an observer.
I wish I was smart enough to understand this.