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  1. winter (velartrill@pleroma.site)'s status on Wednesday, 29-Jul-2020 06:38:48 JST winter winter
    https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser#Implications god the universe is weird
    In conversation Wednesday, 29-Jul-2020 06:38:48 JST from pleroma.site permalink

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      Delayed-choice quantum eraser
      A delayed-choice quantum eraser experiment, first performed by Yoon-Ho Kim, R. Yu, S. P. Kulik, Y. H. Shih and Marlan O. Scully, and reported in early 1999, is an elaboration on the quantum eraser experiment that incorporates concepts considered in Wheeler's delayed-choice experiment. The experiment was designed to investigate peculiar consequences of the well-known double-slit experiment in quantum mechanics, as well as the consequences of quantum entanglement. The delayed-choice quantum eraser experiment investigates a paradox. If a photon manifests itself as though it had come by a single path to the detector, then "common sense" (which Wheeler and others challenge) says that it must have entered the double-slit device as a particle. If a photon manifests itself as though it had come by two indistinguishable paths, then it must have entered the double-slit device as a wave. If the experimental apparatus is changed while the photon is in mid‑flight, then the photon should reverse its original "decision" as to whether to be a wave or a particle. Wheeler pointed out that when these assumptions are applied to a device of interstellar dimensions, a last-minute decision...
    • バツ子(痛いの痛いの飛んでけ;; (shmibs@tomo.airen-no-jikken.icu)'s status on Wednesday, 29-Jul-2020 06:38:41 JST バツ子(痛いの痛いの飛んでけ;; バツ子(痛いの痛いの飛んでけ;;
      in reply to
      • lain
      @lain @velartrill eh, maybe in social sciences that happens more often, but "true" isn't really the way anything is being taught or talked about in "hard" stuff now, think. still go through the whole newton -> tongue-guy・maxwell -> schroedinger progression stuff for every student, and each step gets presented as "these are all models that can make some useful predictions but diverge from what we've measured in other places, and the working assumption is that we're still mostly or completely wrong and there's so much that we just don't know and, really, isn't that kind of beautiful?"
      In conversation Wednesday, 29-Jul-2020 06:38:41 JST permalink
    • lain (lain@lain.com)'s status on Wednesday, 29-Jul-2020 06:38:42 JST lain lain
      in reply to
      @velartrill oh, quantum field theory is undoubtably true, just the 'interpretations' are nonsense and mostly irrelevant.
      In conversation Wednesday, 29-Jul-2020 06:38:42 JST permalink
    • winter (velartrill@pleroma.site)'s status on Wednesday, 29-Jul-2020 06:38:43 JST winter winter
      in reply to
      • lain
      @lain to some extent that's true but mostly not because if it was none of these fancy whizz-bang doodads we use to scam and harass each other from afar would work
      In conversation Wednesday, 29-Jul-2020 06:38:43 JST permalink
    • lain (lain@lain.com)'s status on Wednesday, 29-Jul-2020 06:38:44 JST lain lain
      in reply to
      @velartrill i mostly get the impression that scientist have no idea what they are talking about and don't need to admit it because 'trust science'
      In conversation Wednesday, 29-Jul-2020 06:38:44 JST permalink
    • winter (velartrill@pleroma.site)'s status on Wednesday, 29-Jul-2020 06:38:46 JST winter winter
      in reply to
      you ever get the feeling we're grasping blindly for dark knowledge meant only for god
      In conversation Wednesday, 29-Jul-2020 06:38:46 JST permalink
    • バツ子(痛いの痛いの飛んでけ;; (shmibs@tomo.airen-no-jikken.icu)'s status on Wednesday, 29-Jul-2020 07:03:53 JST バツ子(痛いの痛いの飛んでけ;; バツ子(痛いの痛いの飛んでけ;;
      in reply to
      • lain
      @lain @velartrill eh, that side of things i see mostly as another offshoot of mathematics, playing head games and leaving application-finding to others. and dipping more into the "wild theory" side of things as you get older seems a natural phenomenon too, for many (see gödel・einstein・penrose, or could even bring in newton)maybe there are some physicists pushing it as hard "truth", but personally never met any. the wasting your time・wasting your mind argument is a bit separate from that, but to me feels just "people will do what they enjoy"; not convinced by a must-be-utilitarian position personally. and anyways don't know what things might be "useful" in the future; whole string theory path has definitely stress-tested・expanded on・brought more people into some really neat maths that might be useful elsewhere
      In conversation Wednesday, 29-Jul-2020 07:03:53 JST permalink
    • lain (lain@lain.com)'s status on Wednesday, 29-Jul-2020 07:03:55 JST lain lain
      in reply to
      • バツ子(痛いの痛いの飛んでけ;;
      @shmibs @velartrill i can't agree at all. presumably 'hard' physics has been chasin string theory for 40 decades now (without any experimental connection to reality) because it's 'too beautiful not to be true'. read the stuff Witten says about it. it's not rational and it didn't get us anywhere. Now that it's clear that something like M-Theory (which is a theory in the exact sense that creationists think (and got bashed for by 2010 online atheists)) won't get us anywhere beyond a 'landscape', leading physicist suddenly find that we all probably live in a multiverse (which can't explain anything so it's okay that string theory can't, either). Or the stuff that tegmark talks about, which is also purely philosophical.
      In conversation Wednesday, 29-Jul-2020 07:03:55 JST permalink
    • Infected Moomin (moon@shitposter.club)'s status on Wednesday, 29-Jul-2020 07:05:17 JST Infected Moomin Infected Moomin
      in reply to
      • lain
      • バツ子(痛いの痛いの飛んでけ;;
      • georgia
      @lain @georgia @shmibs @velartrill I'm just favoriting posts in this thread that sound good because I know literally next to nothing about this topic.
      In conversation Wednesday, 29-Jul-2020 07:05:17 JST permalink
      バツ子(痛いの痛いの飛んでけ;; likes this.
    • lain (lain@lain.com)'s status on Wednesday, 29-Jul-2020 07:05:18 JST lain lain
      in reply to
      • バツ子(痛いの痛いの飛んでけ;;
      • georgia
      @georgia @shmibs @velartrill if you still believe in the possibility of supersymmetry i have a bridge and an identical-but-bosonic bridge to sell you
      In conversation Wednesday, 29-Jul-2020 07:05:18 JST permalink
    • georgia (georgia@freespeechextremist.com)'s status on Wednesday, 29-Jul-2020 07:05:20 JST georgia georgia
      in reply to
      • lain
      • バツ子(痛いの痛いの飛んでけ;;
      @lain @shmibs @velartrill m theory is the closest we will have to a theory of everything for a long while. I wonder if/when supersymmetry will be proven.
      In conversation Wednesday, 29-Jul-2020 07:05:20 JST permalink
    • Infected Moomin (moon@shitposter.club)'s status on Wednesday, 29-Jul-2020 07:08:02 JST Infected Moomin Infected Moomin
      in reply to
      • lain
      • バツ子(痛いの痛いの飛んでけ;;
      • georgia
      @lain @georgia @shmibs @velartrill I prefer superstring theory because it sounds like it's string theory 2.
      In conversation Wednesday, 29-Jul-2020 07:08:02 JST permalink
      バツ子(痛いの痛いの飛んでけ;; likes this.
    • lain (lain@lain.com)'s status on Wednesday, 29-Jul-2020 07:08:03 JST lain lain
      in reply to
      • バツ子(痛いの痛いの飛んでけ;;
      • georgia
      • Infected Moomin
      @Moon @georgia @shmibs @velartrill i learned from string theorists that it's not important to be right, it's just important to sound right.
      In conversation Wednesday, 29-Jul-2020 07:08:03 JST permalink
    • winter (velartrill@pleroma.site)'s status on Wednesday, 29-Jul-2020 08:46:06 JST winter winter
      in reply to
      • lain
      • バツ子(痛いの痛いの飛んでけ;;
      @lain @shmibs what i'm getting from this is that string theory is Universal Grammar for physicists
      In conversation Wednesday, 29-Jul-2020 08:46:06 JST permalink
      バツ子(痛いの痛いの飛んでけ;; likes this.

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