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      CommentAuthorMorac
    • CommentTimeApr 18th 2011
     (9771.1)
    Some folks down at the University of New South Wales have apparently made a breakthrough in quantum teleportation, successfully transferring information without losing data (which has apparently been a problem). Instantaneous communication here we come!

    Quantum teleporter breakthrough
    Researchers have achieved a breakthrough in quantum communications and computing using a teleporter and a paradoxical cat...
  1.  (9771.2)
    I got a bit lost in this article, to be honest. Are they saying that they actually teleported the information? As in, without a physical means of transportation? Or are they just saying that they transported it over a medium instantaneously?
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      CommentAuthorMorac
    • CommentTimeApr 18th 2011 edited
     (9771.3)
    Based on my fairly shaky understanding of quantum teleportation, I believe it involves setting some particles at one end in a particular configuration that represents data (much the same way that a computer uses electrical flow to store the bits that make up software). Then they managed to get a second set of particles to change to the same set of data without having to transfer it across all the particles in between the two.

    The big development here is that before the particles would change at the right time, but often would end up with incorrect information (ones when they should get zeroes, and vice versa). Now they've successfully been able to transmit data with very little data loss.
  2.  (9771.4)
    Well that's just beautiful then. The only problem I see arising, with my stupid non-problem-solving brain, is that we'd need to get all of our data everywhere quantum entangled for this technology to be effective.
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      CommentAuthorMorac
    • CommentTimeApr 18th 2011
     (9771.5)
    Well, all we need is a way to translate standard inputs (keyboard/microphone/video/etc) into quantum bits (which isn't a big stretch, considering we already have a similar, though less complicated, system in place for doing the same thing with regular bits), then we just miniaturize the teleporter setup, and stick it in a cellphone, giving us a communication device that a) that has an infinite area of coverage (bounded only by the physical edges of the universe), b) is only limited by the speed of the device (and not the connection, which is the current speed bottleneck) for transferring data, and c) is as secure as a wired connect.
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      CommentAuthorHEY APATHY!
    • CommentTimeApr 18th 2011 edited
     (9771.6)
    remember what happened last time...

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    been reading the TAO of Physics a bit and this quantam stuff is really fascinating thanks for the link now I have to think about this shit all day and maybe, just maybe change the world with an imagination ...
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      CommentAuthorArtenshiur
    • CommentTimeApr 18th 2011
     (9771.7)
    Quantum teleportation does not transfer any classical information faster than light. It transfers quantum information using a combination of classical information transfer (of the conventional variety) and entanglement. The entangled particles are used up in the process.
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      CommentAuthorMorac
    • CommentTimeApr 18th 2011
     (9771.8)
    Would you care to enlighten me on the difference between classical and quantum information?
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      CommentAuthorArtenshiur
    • CommentTimeApr 18th 2011
     (9771.9)
    Classical information is information that can be contained in the physical state of a classical system. If you can arrange rocks so as to convey the information, it's classical. Quantum information is information that can be contained in the physical state of a quantum system. This means it acts funny. For example, in a "two level" system, a bit in classical information, there are your usual two states, yes and no, but there's also yesno and noyes. The information that's getting transmitted "instantaneously" is the difference between yesno and noyes, which can't be converted to classical information per se.
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      CommentAuthorMorac
    • CommentTimeApr 18th 2011 edited
     (9771.10)
    Re-reading the article, it looks like I had things a bit backwards. It's not about transferring classical information over quantum media, but transferring quantum information over classical media (a line the article states that they can transfer it around on light). Now I'm wasting time delving into the computational theory behind the whole quantum model. Looks like there's a bunch of cool applications in cryptography and solving some very mathy problems. No cool potential cellphones (or faster-than-light communication) but interesting nonetheless.


    Edit: Wikipedia has a section on why this has been a problem up to now, but requires making a bit headway in the other quantum computing sections to make sense of.