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Category: Science
Date: 03/14/13 05:31 PM

12 Responses to Single Photon Interference

  1. Profile photo of ElectricEye
    ElectricEye Male 50-59
    2729 posts
    March 14, 2013 at 5:33 pm
    Link: Single Photon Interference - What happens when single photons of light pass through a double slit & are detected by a photomultiplier tube? Science!
  2. Profile photo of Gerry1of1
    Gerry1of1 Male 50-59
    36866 posts
    March 14, 2013 at 5:46 pm

    Side note, the speed of light {299,792,458 meters per second} is not a universal constant. Scientists have slowed photons down to only 38
    miles per hour.

    Google it. Cool stuff.

  3. Profile photo of 5Cats
    5Cats Male 50-59
    33142 posts
    March 14, 2013 at 6:43 pm
    I like science!
    Time theory. Light. Heisenberg`s Uncertianty. Atomic structure? Love it!

    And what uses all these things? The Clock In The Box!

    Quantum Entanglement as it is called these days.
  4. Profile photo of skullgrin
    skullgrin Male 18-29
    937 posts
    March 14, 2013 at 7:49 pm
    this was a pointless video, this has been known for decades. What I`m surprised about is that he did not mention the fact that if we observe the photon the pattern will not be created and the photon will in fact travel through only one slit. Observation turns the photon into a particle. What`s even more interesting is that if we don`t observe the photon until AFTER it passes the slit it will not create the pattern as expected. The photon of light, along with the universe, actually "knows" if we are going to observe it or not before we observe it (or it travels back in time). Either way, it`s very interesting and only further proves we don`t know much about how the universe really works
  5. Profile photo of carmium
    carmium Female 50-59
    6381 posts
    March 14, 2013 at 8:18 pm
    Gee, a cute scientist!
  6. Profile photo of paperduck
    paperduck Male 18-29
    1745 posts
    March 14, 2013 at 11:06 pm
    How can we be sure it`s a single photon every time? And not 2 or 3 that then interfere?
  7. Profile photo of aa2p
    aa2p Male 18-29
    23 posts
    March 14, 2013 at 11:26 pm
    More posts like this
  8. Profile photo of OldOllie
    OldOllie Male 60-69
    15841 posts
    March 14, 2013 at 11:26 pm
    How can we be sure it`s a single photon every time? And not 2 or 3 that then interfere?
    The photomultiplier is detecting single photons. Perhaps the best way to visualize it is that the photon travels as a wave, but it interacts as a particle. That`s not exactly what`s going on, but it`s the best way I know to explain it.

    If you think that`s weird, electrons will do the same thing.
  9. Profile photo of 10Bears
    10Bears Male 30-39
    452 posts
    March 15, 2013 at 2:40 am
    I prefer this video on the same subject http://www.youtube.com/watch?v=tu57B1v0SzI
  10. Profile photo of 5Cats
    5Cats Male 50-59
    33142 posts
    March 15, 2013 at 8:53 am
    electrons will do the same thing.
    lolz @OldOllie: Electrons do a lot more "weird things" too! Naughty little blighters!

    I read your post on the AGW thread (Mar.10 iirc) Very well done!

    How can we be sure it`s a single photon every time? And not 2 or 3 that then interfere?
    @paperduck: iirc, there`s a gizmo that only fires 1 photon at a time. They rig it that way and it`s (apparently) easy to check if it`s working properly.
    The "double slit" experiments are what makes science fun!
  11. Profile photo of handimanner
    handimanner Male 60-69
    2095 posts
    March 15, 2013 at 11:35 am
    How can you be in two places at once if you are really nowhere at all?

    Firesign Theater
  12. Profile photo of OldOllie
    OldOllie Male 60-69
    15841 posts
    March 15, 2013 at 8:27 pm
    @handimanner

    Firesign Theater? Really? Wow! You really ARE as old as you claim to be.

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