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Quantum Teleportation Reaches Farthest Distance Yet — Parallax Forums

Quantum Teleportation Reaches Farthest Distance Yet

Ron CzapalaRon Czapala Posts: 2,418
edited 2014-12-13 14:22 in General Discussion
http://www.space.com/27947-farthest-quantum-teleportation.html
A new distance record has been set in the strange world of quantum teleportation.

In a recent experiment, the quantum state (the direction it was spinning) of a light particle instantly traveled 15.5 miles (25 kilometers) across an optical fiber, becoming the farthest successful quantum teleportation feat yet. Advances in quantum teleportation could lead to better Internet and communication security, and get scientists closer to developing quantum computers.

Comments

  • JohnR2010JohnR2010 Posts: 431
    edited 2014-12-09 04:19
    This stuff just blows my mind. I first read about it a few years ago when they linked two particles and demonstrated they were still linked when separated by a large lake in China. This is all happening faster than the speed of light it has to be!! Finger to head, trigger pulled, brains scattered on wall.
  • TorTor Posts: 2,010
    edited 2014-12-09 05:12
    Yes, it's weird. Of course the speed of light limit is still maintained even with entangled particles, in that it's not possible to use entanglement to transfer information faster than light. There's still something curious going on though, because 'instant' is not something that is supposed to exist. That would imply that the universe has a 'master clock' which everything ticks to, but relativity (tested and verified up, down and sideways and it always holds up) says that there is no such thing as common time. Every one of us moves around with our own time field, so to speak. I move left and you right and so on, and there are tiny differences in our relative times. There shouldn't be a universal clock tick. And quantum mechanics says there is, in a way. That's the headache - both QM and relativity have been "proven right", and are still incompatible.

    Another experiment done recently (originally proposed back in 2001) is where a neutron is sent one way to the destination, and its spin (magnetic moment) another way.. try doing that with a spinning basketball, for example (spin isn't basketball spin, but it's still a property of the particle). The property can be separated from its particle.. who would have thought that?*The Quantum Chesire Cat - phys.org

    When Schr
  • Clock LoopClock Loop Posts: 2,069
    edited 2014-12-09 18:07
    The important thing to note here is that when these stories are told, they aren't specific of the set and setting for the photons to do the dirty deed.

    In this one, they have a fiber that links the two photons.
    But the crux question is, was the fiber cut before the destination photon is destroyed?

    Do any of these "entanglement" experiments exist without the original resonant cavity still intact?
    (laser in air is still a resonant cavity)

    They need to make the first..... PHONETON, where each end has a "bottle" of unused entangled photons...

    Anyone have an experiment where total isolation was done before testing entangled ability?
  • TorTor Posts: 2,010
    edited 2014-12-10 02:37
    Hmm... I believe I've seen something like that, but can't find it right now. Maybe this one will do instead: Entangling photons that never coexist in time - phys.org
  • PliersPliers Posts: 280
    edited 2014-12-10 09:50
    Quantum entanglement is something my volt meter leads do when I'm not looking.
    tangled-cords.jpg
    400 x 300 - 46K
  • localrogerlocalroger Posts: 3,451
    edited 2014-12-13 14:22
    Schr
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