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Showing content with the highest reputation on 01/13/24 in all areas

  1. Alkonoklazt has been suspended for a week because staff would like a break from all the rebellion against the system.
    3 points
  2. Because that’s trivially known, if you’re familiar with atomic physics. Your tone suggests that you think it hasn’t been done. I’ve done it. One way is to send it through a polarizing beam-splitter cube. If the polarization is in one direction it goes straight through. If it’s orthogonal it gets reflected. Knowing which way it goes tells you the polarization I have no idea of the context of this question, but spacetime means you’re talking about relativity, and entanglement is a quantum effect. So you need to explain the connection.
    2 points
  3. You are looking at photons right now in reading this. Now just take it for granted that I entangled one of them. How would you tell it apart from the other trillions of photons, and then to prove entanglement you need to measure it which first means isolating the entangled proton, then measuring it, which would invoke Heisenberg's indeterminacy principle making an accurate measurement if not impossible, at least always suspect. Note, I am not arguing that entanglement happens, just wondering how one would find a proton that is entangled say a million miles away?
    1 point
  4. I used to teach the folks running the reactor. If you actually knew more your son would be in violation of national security laws for having divulged classified material to you, and he’d lose his clearance, and probably his job and pension. You don’t need to separate them; most are irrelevant. They would be thermal photons that don’t trigger the photodetectors. If these are near-visible or visible wavelength photons being entangled and you’re worried about contamination, there are wavelength filters and also the very technologically sophisticated step of turning the room lights off during the experiment. There’s also the coincidence measurement I mentioned, which is a filter in the time domain.
    1 point
  5. No it's your bad faith arguing that leads me to that conclusion. Is that what you think is going on here, your genius is not being recognized?
    1 point
  6. Again, your idea of what’s going on isn’t how the experiment is run. It’s done under controlled conditions so there’s virtually no other candidate photons, and you do coincidence measurement to screen out extraneous signals. If you do e.g. spontaneous parametric down-conversion, the entangled pairs are emitted in a particular direction. The bottom line is the folks doing these experiments understand what’s going on, as opposed to some hecklers in the peanut gallery. Declaring that “this can’t work” and the insinuation that you know more than the scientist who have performed the experiments isn’t a good look in light of the fact that this does work.
    1 point
  7. That and other comments simply sounds like anti-science trolling.
    1 point
  8. I am fairly confident that my generation has been able to retain its longer pre-web attention spans wow is that a gray squirrel in the yard haven't seen one this far west in years!
    1 point
  9. I like the way Axios summarized this same idea in table format: In addition to my previous reply yesterday, I realized last night that weather like this will also selectively assist those candidates with the strongest ground game. Specifically, those candidacies with lots and lots of volunteers, interns, college kids, etc. showing up to peoples front doors, picking them up in their cars / vans, and shuttling people to and from their caucus locations. Candidates lacking that level of city by city, county by county, town by town coordination and human centered operations will be weaker overall than those candidates who’ve spent the last several months building out that “infrastructure.” And all because Mother Nature kissed us with her blizzard tongue this weekend.
    1 point
  10. I don't know but probably just some saddo annoying me. It's the first time anyone's ever made even a token effort to hack me AFAIK. Updating my password on my various devices was tedious but probably very low security risk.
    1 point
  11. That is true and exactly the problem. For example, attentionspan and is going down everywhere, but it is not clear whether current tests account for them.
    1 point
  12. I used to think dyslexia was rather nebulous until I saw it with my own eyes. I literally saw some letters change on the page to the correct ones after initially misreading it.
    1 point
  13. How do you know that the photon that you measured is the entangled one, or do you send one photon, and if you do that how do you isolate one photon?
    1 point
  14. Using a polarizer. You can easily look it up, just google, "how to measure the spin of a photon". You seem to have this attitude that if you don't know something or if it doesn't make sense to you then it must be wrong.
    1 point
  15. I just found this on the net for the longest entanglement yet, but this at least was contained to optical fiber. Physicists from the Austrian Academy of Sciences have succeeded for the first time in entangling photons over 248 kilometers of optical fiber. For quantum communication, this is a new long-distance record and a significant step on the way to the quantum internet. Previously, the maximum distance was 100 kilometers. The last time that I looked over this I predicted that entanglement would be used for communication but all the predictions said that entanglement could not be used for communication for several reasons. So did that change or was I watching all Dis info because this involves military codes and the Chinese appear to have the lead here. I also found another article where China demonstrated entanglement with a satellite at a 1000 kilometer range.
    1 point
  16. To add to what exchemist said - at each step of using waste heat the medium is at a lower temperature, so you quickly lose the ability to extract work.
    1 point
  17. You can't just recycle it, because of "entropy", but you may be able to get some further use out of it, depending on the circumstances. The basic problem is that heat energy is the kinetic energy of random motion of atoms and molecules. It is thus in a sense "disordered" and cannot be completely re-ordered again. All non-reversible processes lead to an increase in entropy, which means (loosely speaking) a dispersion of energy in a way that cannot be completely recovered. However waste heat from many processes can be put to further use. For example waste heat from power stations can heat homes, commercial greenhouses, or swimming pools. And heat pumps can raise the temperature of heat energy from ambient air or the ground to something useful for home heating, although some extra energy has to be put in to do that. High temperature heat energy has lower entropy than low temperature heat energy, so the higher the temperature the more uses it can be put to. Machines like car engines and power station turbines are "heat engines", which rely on converting high temperature heat energy into mechanical work. However, due to the disordered nature of heat energy, they can't convert 100% of it, so there is always waste heat rejected from any heat engine, usually more than half of it in fact. I've tried to explain this in simple words, but really you need to read about the second law of thermodynamics and a bit about the concept of entropy, to see what the limitations are.
    1 point
  18. You forgot to detail both how the photons are measured to determine spin, nor how the distant photon is found and measured say on a Voyager probe.
    0 points
  19. Except that a single photon is not visible and you have no idea which one is the entangled one in the bunch so your odds would never be more than 50/50 which means that knowing is impossible.
    -3 points
  20. What you just said is that I am a troll because you do not know the answer. You are correct that I question things, as did Galileo who was jailed for not agreeing with the establishment. Has anything changed? Asking for the answer to the question. What is the process of separating 1 photon moving at light speed from the trillions around it? Is this a crime?
    -3 points
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