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Teleportation (new Danish experiment with light and cesium atoms)

  1. Oct 5, 2006 #1

    marcus

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    http://physicsweb.org/articles/news/10/10/6/1?rss=2.0

    ===sample===
    5 October 2006
    Danish physicists have managed to light-up a cloud of atoms using light teleported from a source half a metre away.

    Since Charles Bennett and his team first proposed quantum teleportation in 1993, science fiction enthusiasts have had to be content with frustratingly prosaic examples of the principle. However, at the University of Copenhagen in Denmark, physicists have passed a milestone that will help to bring some practical applications of teleportation within sight (Nature 443 557).


    Glowing caesium
    “This is the first time teleportation has been achieved between the ‘flying’ medium of light and the ‘stationary medium’ of atoms,” said Eugene Polzik of Copenhagen. “Such teleportation could serve as a main building block of a quantum network connecting distant quantum processors.”

    Quantum teleportation cleverly evades one of the best known peculiarities of quantum states – their inability to be measured precisely. Only some of the information of a quantum state can be learned in a single measurement, and once that measurement is made, the quantum state is effectively destroyed.
     
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  3. Oct 5, 2006 #2

    marcus

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  4. Oct 5, 2006 #3
  5. Oct 5, 2006 #4
  6. Oct 6, 2006 #5
    Please note this: http://arxiv.org/abs/quant-ph/0608133
    Fidelity of 0.85 which is slightly above ( :P ) 0.6
    It's sad that only some deliberately chosen experiments deserve attention of news, that is, having no offense to Danish scientists.
     
    Last edited: Oct 6, 2006
  7. Oct 6, 2006 #6
    Thanks Chipset. Note that this is a newer posting on archiv. Hammerer is evidently a coworker and coauthor with Polzik and the others.

    Probably the Nature article was submitted to the magazine soon after the first paper came out, and was only recently published. Score another point for internet over print media.

    Note at the end of the paper linked in post 3 of this thread that higher values of fidelity are predicted, with a description of how to attain them. Good to see this work progressing. The authors expect to attain nearly perfect fidelity in future.

    S.
     
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