Edit: Or none depending on how you see it. No atoms were formed directly at the Big Bang because too hot, but all atoms’ existence is a pretty direct consequence of it
If that’s the case I would say none then. The constitute parts aren’t the item. (How many ships are produced by a forest? None, we use the wood to make the ships.)
All of them? At what point do we consider new atom formation to not be a part of the big bang? Isn’t it still ongoing, at least until expansion and atomic formation stops?
Why is this whole post about photons? I always thought that the double slit experiment was interesting because this happened with electrons, even individual electrons would still generate the interference pattern, and I guess I always thought that you could detect which slit the election went through by detecting an induced current or something
They talk about how it was never actually possible to do this before, because it requires very fine “electron optics” and manufacturing of components, like slits and shutters, with nanometer precision. So while the thought experiment with electrons itself was proposed by Feynman in 1963 (which is probably what inspired the monkey meme and the like), it was not actually realized until 2019. I’m also now guessing that the electron quantum eraser paper from 2014 doesn’t use a double slit but some other electronic quantum circuit that is easier to work with.
The two-stripe photo to match the monkey meme, with electrons and measuring which-way information, probably doesn’t exist yet. So that’s why!
Yes, double slit interference happens with both photons and electrons, and even with C60 buckyballs and organic fluorescent dye molecules (arxiv.org/abs/1402.1867)! This post is more so about the quantum eraser, as a counterpoint to the 12 posts about it that @kromem wrote in the other thread. The first experimental quantum eraser paper from 2001 uses photons, so that’s the figures I used here. There might be newer papers that use electrons, like this one doi.org/10.1126/science.1248459 from 2014, but I don’t have access to it. I presume detecting the electron there using induced current or whatever would disturb its wavefunction to the same severity as using the polarizer filter does here.
Holy smokes! I always thought it just showed that electrons and photons aren’t ‘really’ particles, I had no idea it also worked for atoms and even molecules.
Well given that I remember my professors barely knew how to code when they were the ones teaching us, I’m never surprised computational papers are like this…
That’s what you get when people never learn alternatives to MacOS or Windows
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