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Science & Technology

Scientists teleport photons over 97 km

By T.K. Randall
May 13, 2012 · Comment icon 29 comments

Image Credit: Novosibirsk University
Chinese physicists have managed to teleport photons over 97km using quantum entanglement.
The achievement is a significant step towards an ultra-secure communication system that would be immune to eavesdropping. The team had achieved success before in 2010 when they managed to teleport a photon 16km. "The successful quantum teleportation over such channel losses in combination with our high-frequency and high-accuracy [aiming] technique show the feasibility of satellite-based ultra-long-distance quantum teleportation," said Juan Yin at the University of Science and Technology in Shanghai.
The idea is not that the physical object is teleported but the information that describes it. This can then be applied to a similar object in a new location which effectively takes on the new identity.


Source: Technology Review | Comments (29)

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Recent comments on this story
Comment icon #20 Posted by Khaleid 12 years ago
Briefly, quantum teleportation refers to the process of: Destroying an object at position A, In the process, encoding all the information about that object on to some carrier wave, Sending the carrier wave to position B, Destroying the carrier wave but in the process constructing a new object identical to the original one. So they don't really teleport a photon, they simply teleport the information and ``write'' that information on a new photon. As and then mentions, since a photon is a quanta of light this does not seem that remarkable. The key thing (as mentioned in some of the comments in l... [More]
Comment icon #21 Posted by sepulchrave 12 years ago
That's still the definition of "clone", not teleportation. If you don't force destroy the first object, what would you call the 2nd object? Copy? That is your definition of ``clone''. If you want to call it ``quantum cloning'' then that is fine. If you have an object at location A that disintegrates and an identical object (in every way, right down to the quantum level) is constituted at location B I would say that the object was ``teleported''. To me, ``cloning'' is the same as ``copying'', and does not imply a translation in space. Ultimately, I think, the name comes from the fact that the i... [More]
Comment icon #22 Posted by spud the mackem 12 years ago
How do they know that the Photons they sent are the same ones that arrived ?..they must have put a label on them like "made in china",or coloured them yellow.Hey guys a photon has just knocked on my door.I wont answer the door as it might be an illegal asking for asylum.Resistance is futile,Eliminate........
Comment icon #23 Posted by skookum 12 years ago
Like people have said it has been done before. It is only news because China have done it, the new financial super power. No doubt in a few years the conspiracy theorists will claim the technology came from a captured UFO.
Comment icon #24 Posted by Framling 12 years ago
That's a fancy fax machine.
Comment icon #25 Posted by Khaleid 12 years ago
The trick is that we are sort of ``swapping entanglement''. I start with a delicate quantum state at position A. Moving this object may not be possible; any physical perturbation could destroy it. But if I can entangle this quantum state with a carrier wave, then I can send the carrier wave where-ever I want it to go (position . Then at position B I entangle the carrier wave with a ``blank'' object. This is where the ``spooky action at a distance'' comes in to play; the original quantum state at position A is erased (randomized) and the ``blank'' object at position B now contains the quantum s... [More]
Comment icon #26 Posted by psyche101 12 years ago
That is your definition of ``clone''. If you want to call it ``quantum cloning'' then that is fine. If you have an object at location A that disintegrates and an identical object (in every way, right down to the quantum level) is constituted at location B I would say that the object was ``teleported''. To me, ``cloning'' is the same as ``copying'', and does not imply a translation in space. Ultimately, I think, the name comes from the fact that the information is transmitted, and I think there is the philosophical viewpoint that the information is the important thing. After all, we are all mad... [More]
Comment icon #27 Posted by sepulchrave 12 years ago
Would this also teleport the data held within the object i.e. memories? If you were teleporting a person? I don't know. In principle it should work, but in practice can you cool a person to 0 K without destroying the subtleties of their brain that define their memories and personalities? I kind of doubt it. Whatever data exists in the object at 0 K in a complete vacuum would get teleported perfectly. Whether or not that data is the same as the data in the object under normal operating conditions is a different story.
Comment icon #28 Posted by FlyingAngel 12 years ago
What if the one at the destination is not the one at the origin? You know when a person A is disintegrated, he's dead for a fraction of second. But once dead it's dead, there is no such thing as revival. The person B could have all the memories and genes inherited from A, but it's just a clone reconstructed and think that he is teleported because he has the memory that 1s ago, he's A. But in fact, he's not A and there is no way to verify it even if he claims he's A.
Comment icon #29 Posted by questionmark 12 years ago
If you were teleporting a person? I don't know. In principle it should work, but in practice can you cool a person to 0 K without destroying the subtleties of their brain that define their memories and personalities? I kind of doubt it. Whatever data exists in the object at 0 K in a complete vacuum would get teleported perfectly. Whether or not that data is the same as the data in the object under normal operating conditions is a different story. I can tell you this much: at 0K there is no more biological activity (in fact very little atomic activity) so there will be no more memory unless the... [More]
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