Teleportation Goes Long Distance

KingFishKingFish
edited August 2004 in Science & Tech
Physicists have carried out successful teleportation with particles of light over a distance of 600m across the River Danube in Austria.
Long distance teleportation is crucial if dreams of superfast quantum computing are to be realised. When physicists say "teleportation", they are describing the transfer of key properties from one particle to another without a physical link. The team has published its findings in the academic journal Nature.
Source: BBC News

Comments

  • entropyentropy Yah-Der-Hey (Wisconsin)
    edited August 2004
    What? I don't get it. What's the need for the fiber optics? If the particles are entangled, one should take the properties of the other no matter what, automatically, supposedly no matter where it is. What in the hell do they need the cable for???
  • ThraxThrax 🐌 Austin, TX Icrontian
    edited August 2004
    To send the particles. Quantum communication requires photons, and photons can be sent via fibre optics.
  • entropyentropy Yah-Der-Hey (Wisconsin)
    edited August 2004
    What, so they just flung off that single photon into the fiber optics after entangling it?
  • ThraxThrax 🐌 Austin, TX Icrontian
    edited August 2004
    Yeah. One photon stays at one end, and the other photon goes to the other end. Then you could feasibly remove the link.
  • entropyentropy Yah-Der-Hey (Wisconsin)
    edited August 2004
    I guess I'm kind of confused ... I love physics, but I don't know all that much about them. So, they use photons...well...photons are light ... and how the hell do you trap light to study it? Especially a single photon....:confused:
  • ThraxThrax 🐌 Austin, TX Icrontian
    edited August 2004
    Basically, without getting too technical, you fire two lasers at one another. Einstein's theory of lasers distorting space/time turns out to be true. When the lasers impact, you get weirdo concentric rings. Where the rings overlap you have a photon-based quantum pair.
  • entropyentropy Yah-Der-Hey (Wisconsin)
    edited August 2004
    Oh, ok, so that explains how they got them entangled, but now how do they study it? You can't trap light to study it, that's why i'm confused. Unless they use instruments to sense a certain, minuscule change? But how could they not lose those two photons when they collide?
  • croc_croc_ New
    edited August 2004
    ...
  • botheredbothered Manchester UK
    edited August 2004
    The sound of one hand clapping.
  • RWBRWB Icrontian
    edited August 2004
    Thrax, you scare the hell outta me. :wtf:
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