Two Universities in China succeeded in quantum teleportation

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Discussion Overview

The discussion centers around the recent achievement of quantum teleportation conducted by the University of Science and Technology of China and Tsinghua University over a distance of 16 km. Participants explore the implications of this advancement for quantum information technology and its potential applications in the future.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants inquire about the prospects of quantum information and how long it might take to become as common as current technologies.
  • One participant questions the claim of instantaneous information transfer, arguing that it contradicts Special Relativity and that entangled particles do not allow for controlled communication.
  • Another participant notes that the recent experiment is a free-space implementation of previous work done using optical fibers, suggesting that while it is technically impressive, it does not introduce new physics.
  • Some participants express a need for links to the original reports, noting that they are primarily available in Chinese.
  • There is a discussion about whether the researchers are claiming to use non-classical means for communication, with some clarifying that it is quantum communication but consistent with conventional quantum mechanics.
  • A participant emphasizes the importance of reading the actual paper to understand the context and limitations of the findings, reiterating that the experiment extends previous work rather than presenting fundamentally new concepts.

Areas of Agreement / Disagreement

Participants express a mix of curiosity and skepticism regarding the implications of the quantum teleportation achievement. There is no consensus on the significance of the findings or their potential applications, with some viewing it as a continuation of existing research and others questioning the interpretations of the results.

Contextual Notes

Participants highlight the need for clarity regarding the definitions of terms like "non-classical" and the implications of quantum communication, indicating that assumptions about the nature of information transfer and the relationship to established physics remain unresolved.

wengsee
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Recently ,it is reported that University of science and technology of China and Tsinghua University together have succeeded in conducting quantum teleportation between the distance of 16km.Are quantum information prospectinve? And how long it will be applied as commonly as the present one ?
http://news.ustc.edu.cn/?article=00023439&
 
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wengsee said:
Recently ,it is reported that University of science and technology of China and Tsinghua University together have succeeded in conducting quantum teleportation between the distance of 16km.Are quantum information prospectinve? And how long it will be applied as commonly as the present one ?

Do you have links to these reports?
 
wengsee said:
Recently ,it is reported that University of science and technology of China and Tsinghua University together have succeeded in conducting quantum teleportation between the distance of 16km.Are quantum information prospectinve? And how long it will be applied as commonly as the present one ?

I understand this to mean that they are actually claming to be transmitting information instantaneously from one place to another. But isn't that contrary to Special Relativity? I don't see how just because a pair of particles are correlated because they share a common source (entangled) is going to allow instantaneous information transfer. As I understand it the particle properties you read at one end is of a random nature and you can not force what the measurement will be. So you cannot force what the measurement will be on the other side. And so you cannot communicate this way. The best you can obtain is the knowledge that the two particles are correlated after you compare notes after all the measuring is done.
 
What they've done is just a free-space implementation of something that has done using optical fibres for a long time (the first experiment were done nearly 15 years ago). It is an impressive technical feat, but there is no new physics.

And no, you can not use this technique to transmit information FTL. But techniques/methods related to this could be useful for e.g. quantum cryptography etc..
 
We can translate, thank you wengsee.

F95toli: They are not claiming to have used non-classical means for the communication, are they?!
 
Geigerclick said:
We can translate, thank you wengsee.

F95toli: They are not claiming to have used non-classical means for the communication, are they?!

Depends on what you mean by "non-classical". It is quantum communication after all.
But they are not claiming that they are doing something that does not agree with conventional (and well understood) QM if that is what you mean.
 
f95toli said:
Depends on what you mean by "non-classical". It is quantum communication after all.
But they are not claiming that they are doing something that does not agree with conventional (and well understood) QM if that is what you mean.

That's what I mean, thanks. :)
 
  • #10
I think people should read the actual paper, if they can. As f95toli has said, there isn't much new physics in this. They are just doing this over free space over a longer distance than before (read the references). So they're extending such quantum teleportation up to 16 km via free space, rather than fiber optics.

This is was the first such experiment, it would have been in Nature, not in Nature Photonics.

Zz.
 

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