Zero-capacity x 2 = 1 quantum channel

Discussion in 'Physics & Math' started by Vkothii, Sep 27, 2008.

  1. Vkothii Banned

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    Uh huh. So it's about having 2 of these things, or a zero-capacity quantum channel can have a non-zero-capacity if it gets 'cloned'. Interesting; make two edges into a usable gap between, type of thing.
     
  2. CheskiChips Banned

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    They couldn't even isolate Gravity Prope-B from gravitational perturbations by solar flares. How do they expect to isolate quantum-streams from outside interference and maintain valid data transfer? Unless a miraculous alloy allows for amazing containment this will never be plausible.

    The only potential I can see for this is local computation.

    Where an external detection would alter an internal electrical field to be directly opposite to the external field. Where the actual computation would exist inside an object shielded from the direct effects of the internal field...or is somehow accounted for.

    In either case the throughput would only be equal to information transfer speed exported outside of the containment shields.
     
  3. Vkothii Banned

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    hmm.
     
    Last edited: Sep 27, 2008
  4. CheskiChips Banned

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    What is the uniqueness of any given channel?
     
  5. Vkothii Banned

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    Sorry, you might need to qualify the question? What do you mean by "uniqueness"?
    There are two channels - each has zero capacity, but together they 'activate' each other.
     
  6. CheskiChips Banned

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    I might be confusing the issue, but the article posted was about use Quantum mechanics in communication. Also it implied its use in quantum processing. Meaning the processor would have to have multiple different channel sets to operate binary, even if it was only two.

    What uniqueness exists between the two sets that would allow the channels to not interact with each other?
     
  7. Vkothii Banned

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    All I can suggest is: read the article.

    The intro article from arxivblog.com mentions QP, but it's about a particular kind of channel; the paper (on arxiv) is about communications not about processing.
     
    Last edited: Sep 27, 2008
  8. Vkothii Banned

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    Here's the thing with this supposedly 'new' quantum information channel.

    Because of entanglement, quantum information is fundamentally different to classical, the signal/noise ratio is not necessarily a limit for QI, as for a classical channel. This is what these researchers were looking at.

    In this case, with two different kinds of channels - that have different reasons for having zero capacity, there's still a correlation if both outputs are measured jointly. A necessary condition is that one channel not have separable states; or this appears to be tied to some kind of separability principle (maybe).
     

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