Teleportation (new Danish experiment with light and cesium atoms)

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Discussion Overview

The discussion centers around a recent experiment conducted by Danish physicists involving quantum teleportation of light to cesium atoms. The focus is on the implications of this experiment for future quantum networks and the fidelity of the teleportation process.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants highlight that this experiment marks the first successful teleportation between light and stationary atoms, suggesting potential applications in quantum networking.
  • Others reference the fidelity of the teleportation achieved, noting a value of 0.85, which is considered above a previously mentioned threshold of 0.6.
  • A participant expresses concern about the selective attention given to certain experiments in media coverage, implying a bias in what is reported.
  • There is mention of predictions for higher fidelity values in future experiments, with discussions on methods to achieve these improvements.
  • Some participants acknowledge the role of the internet in disseminating research findings more rapidly than traditional print media.

Areas of Agreement / Disagreement

Participants express a mix of enthusiasm for the experiment's implications and skepticism regarding the fidelity and media representation of scientific findings. No consensus is reached on the significance of the fidelity value or the media's role in scientific communication.

Contextual Notes

There are unresolved questions regarding the implications of the fidelity levels and the specific conditions under which the teleportation was achieved. The discussion also reflects differing perspectives on the importance of media coverage in science.

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

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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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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.
 
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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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