It does, but you seem to be on thin ground to be agreeing with a pop site written for the lay public instead of say grad students. Argument from authority doesn’t help. These PhDs write differently for different audiences.If you don't know what relativity of simultaneity (RoS) is, then you don't have the tools to assess the validity of my criticism of the wording used in the article.
— noAxioms
To do with reference frames and the relativity of time of measurement, I guess. — Wayfarer
Such articles are not accepted as evidence at a site like physicsforums.com . A college level textbook is, but most college courses teach quantum mechanics theory and barely touch on the interpretations, which is not theory.I can only get information from popular science, like Quanta Magazine and PBS Space Time, but the writers in those media are qualified in physics, in fact both have PhD's in the subject. Nowhere have you referred to any sources, so I'm inclined to believe them over you.
Principle of locality and principle of counterfactual definiteness, the latter being summarized in wiki thus:Choose between what principles?
Agree, but the other interpretations are specific speculations about what it means. I’m saying there’s not one speculation that is the official Copenhagen speculation. With the other interpretations, one can point to one paper that defines the initial (and sometimes revised) view.The Copenhagen interpretation are philosophical speculations about what it means.
This sounds close to the mark.It is my understanding that the Copenhagen Interpretation is not a "philosophical speculation." It represents a refusal to speculate. Metaphysics pared down to a minimum. — Clarky
I didn’t watch any videos, but that sounds right: CFD vs locality. Yes, if locality isn’t violated, there isn’t superluminal causality. That’s what locality means.The video you provided talked about the violation of realism versus the violation of locality. According to the narrator, if realism is violated, but locality isn't, there is no superluminal causality or communication. Or is it the other way around. Please don't ask me to explain, — Clarky
This is a rejection of CFD, but if CFD is accepted (as your articles do), then that’s a different speculation. CFD can’t be proved, but neither can it be falsified.It is meaningless to assign reality to the Universe in the absence of observation.
— Neils Bohr
Copenhagen indeed does not typically list CFD as a premise (on wiki say), but I went hunting for an article you might like, and they all say different things, and the vast majority of the articles I found made meaningful statements about unmeasured things.Here, it is explained, "object permanence" is being questioned. It is typical of the 'copenhagen interpretation'. — Wayfarer
They put a beam splitter in space. Is that so remarkable? There is no maximum distance to entanglement, so ‘smashing’ some kind of distance record seems news worthy only to the lay public. I’ve seem similar claims of smashing the speed record, which, per RoS, is utterly meaningless.Quantum entanglement—physics at its strangest—has moved out of this world and into space. In a study that shows China's growing mastery of both the quantum world and space science, a team of physicists reports that it sent eerily intertwined quantum particles from a satellite to ground stations separated by 1200 kilometers, smashing the previous world record.
Yes, for the reasons I posted, not one of which has been refuted by somebody who understands the basics.So, you're disputing that this is evidence of 'spooky action at a distance'?
It can be. Nobody has proven locality. It just hasn’t been falsified.Why can't reality be non-local? — Landoma1
Such articles are not accepted as evidence at a site like physicsforums.com . — noAxioms
I don’t deny the correlation at a distance. — noAxioms
They have a whole subforum for quantum interpretations, and yes, it's all philosophy in there. But they have standards for what constitutes an authoritative source, so say Everett's paper on Relative State Formulation is an authoritative source, but the wiki page on MWI is not. The latter is much easier to understand, and actually gets it reasonably correct.That's because physics forum gives short shrift to anything the classify as philosophy. I've posted there a bit. — Wayfarer
Here, it is explained, "object permanence" is being questioned. It is typical of the 'copenhagen interpretation'. — Wayfarer
But I am going to say that I think to all intents, (a) simultaneous and instantaneous mean the same in this context, — Wayfarer
Acceleration has never been adequately understood by human beings. — Metaphysician Undercover
They (physics forum) have a whole subforum for quantum interpretations — noAxioms
Simultaneous means at the same time, and as noAxioms explained, in relativity theory whether or not two events are simultaneous may be dependent on the frame of reference. — Metaphysician Undercover
According to some interpretations of quantum mechanics, the effect of one measurement occurs instantly. Other interpretations which don't recognize wavefunction collapse dispute that there is any "effect" at all. However, all interpretations agree that entanglement produces correlation between the measurements and that the mutual information between the entangled particles can be exploited.
From past posts I assume you refer to instantaneous acceleration. — jgill
But logically, as the superposition refers to all of the elements in an entangled system, then to measure the one is to measure the other. — Wayfarer
Both of those links are really helpful. Thanks. — Clarky
Bell’s theorem (1964) asserts that it is impossible to mimic quantum theory by introducing a set of objective local “hidden” variables. It follows that any classical imitation of quantum mechanics is necessarily nonlocal. However Bell’s theorem does not imply the existence of any nonlocality in quantum theory itself. In particular relativistic quantum field theory is manifestly local. The simple and obvious fact is that information has to be carried by material objects, quantized or not. Therefore quantum measurements do not allow any information to be transmitted faster than the characteristic velocity that appears in the Green’s functions of the particles emitted in the experiment. In a Lorentz invariant theory, this limit is the velocity of light.
In summary, relativistic causality cannot be violated by quantum measurements. The only physical assumption that is needed to prove this assertion is that Lorentz transformations of the spacetime coordinates are implemented in quantum theory by unitary transformations of the various operators. This is the same as saying that the Lorentz group is a valid symmetry of the physical system (Weinberg, 1995). — Quantum Information and Relativity Theory - Asher Peres, Daniel R. Terno, 2003
The world is not locally realistic. — Andrew M
Schrödinger thought that the Greeks had a kind of hold over us — they saw that the only way to make progress in thinking about the world was to talk about it without the “knowing subject” in it. QBism goes against that strain by saying that quantum mechanics is not about how the world is without us; instead it’s precisely about us in the world. The subject matter of the theory is not the world or us but us-within-the-world, the interface between the two. — Chris Fuchs
Thanks again. — Clarky
What does 'locally realistic' mean? It doesn't make a lot of sense as plain English. — Wayfarer
There are two assumptions made in the proof of (2.225) which are questionable:
(1) The assumption that the physical properties PQ, PR, PS, PT have definite values Q, R, S, T which exist independent of observation. This is sometimes known as the assumption of realism.
(2) The assumption that Alice performing her measurement does not influence the result of Bob’s measurement. This is sometimes known as the assumption of locality.
These two assumptions together are known as the assumptions of local realism. They are certainly intuitively plausible assumptions about how the world works, and they fit our everyday experience. Yet the Bell inequalities show that at least one of these assumptions is not correct.
What can we learn from Bell’s inequality? For physicists, the most important lesson is that their deeply held commonsense intuitions about how the world works are wrong. The world is not locally realistic. Most physicists take the point of view that it is the assumption of realism which needs to be dropped from our worldview in quantum mechanics, although others have argued that the assumption of locality should be dropped instead. Regardless, Bell’s inequality together with substantial experimental evidence now points to the conclusion that either or both of locality and realism must be dropped from our view of the world if we are to develop a good intuitive understanding of quantum mechanics. — Quantum Computation and Quantum Information - Nielsen and Chuang
Incidentally, I've been reading an article on QBism. As far as I understand it, it makes sense to me.
Schrödinger thought that the Greeks had a kind of hold over us — they saw that the only way to make progress in thinking about the world was to talk about it without the “knowing subject” in it. QBism goes against that strain by saying that quantum mechanics is not about how the world is without us; instead it’s precisely about us in the world. The subject matter of the theory is not the world or us but us-within-the-world, the interface between the two.
— Chris Fuchs
That really nails it for me, because, if you think about it, it actually lines up with Kant. — Wayfarer
But logically, as the superposition refers to all of the elements in an entangled system, then to measure the one is to measure the other. — Wayfarer
For physicists, the most important lesson is that their deeply held commonsense intuitions about how the world works are wrong. — Quantum Computation and Quantum Information - Nielsen and Chuang
Then again, physicists and the rest of us can count on both realism and locality in the world where we live our lives. I'm not saying the results of quantum mechanics aren't important, but they are scale-dependent. Here at human scale, we can live our lives as we always have. — Clarky
That Alice measures her entangled particle doesn't imply that a measurement has been made or ever will be made on Bob's entangled particle. — Andrew M
"Quantum Computation and Quantum Information - Nielsen and Chuang"]For physicists, the most important lesson is that their deeply held commonsense intuitions about how the world works are wrong.
Here at human scale, we can live our lives as we always have. — Clarky
The DE is an energy that doesn't dilute if space grows. If you put giant springs between all galaxies you could stop expansion. — Landoma1
I’m no authority on physics but I’m interested in the philosophical implications — Wayfarer
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