Chinese Physicists Smash Distance Record For Teleportation , page 1

Chinese Physicists Smash Distance Record For Teleportation

www.technologyreview.com

The ability to teleport photons through 100 kilometres of free space opens the way for satellite-based quantum communications, say researchers

(visit the link for the full news article)

Teleportation has been around for a while now. Physicists have been using the principle of "action at a distance" and "quantum entanglement" since 1997 to teleport photons. However, this experiment brings new sophistication and greater distance than ever before.

It is not yet possible to teleport entire objects, like an apple or a person, say. Only tiny particles like photons.

However, this news is significant for a number of reasons. First, it is a major step forward. Second, even if entire objects cannot be transported this way, this technology can be used to transport information in the form of binary code. With information transported this way, faster-than-ever communication is a real possibily. And with technology like 3-D printing becoming more sophisticated, in many cases transported information can be used to build an object at a distance. This article also has geopolitical implications: Many in the West have claimed the Chinese are "only good at copying and not at innovating," but if they are taking the lead in technology like this, is an intellectually powerful China that can lead in innovation as well as cheap manufacturing all that far behind?

www.technologyreview.com
(visit the link for the full news article)

reply to post by mr-lizard

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Everything is military no matter who creates it.
Everybody wants security.

reply to post by MysterX

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Hopefully quantum computation comes out soon. Im sure they are close to the first quantum based processing chip.

reply to post by silent thunder

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It is not yet possible to teleport entire objects, like an apple or a person, say. Only tiny molecules like photons.

Nothing is actually teleported. The photons are shot with a laser beam, they travel, they are not teleported.

What is "teleported" is the state of the particle once it has arrived, because of entanglement.

However, this news is significant for a number of reasons. First, it is a major step forward. Second, even if entire objects cannot be transported this way, this technology can be used to transport information in the form of binary code. With information transported this way, faster-than-ever communication is a real possibily.

This is not about FTL communications or teleporting matter, it is about encrypting info.

In order to for this to work they still need to send a conventional signal with the info of the measurement.

However, a major restriction in this experiment is that the unknown quantum state cannot directly come from outside.

Charlie dis- tributes an entangled pair of photons 2 and 3 to Alice and Bob, where Bob is at a distant location. Due to the nite size of the telescopes Bob and Charlie can use and the di raction limit, Bob will receive the signal photon with very high loss. Alice then performs a joint Bell-state measurement (BSM) on the initial particle and one of the entangled photons from Charlie, projecting them onto an entangled state. After she has sent the result of her measurement as classical information to Bob, he can perform a unitary transformation (U) on his photon to obtain the initial state.

arxiv.org...

Quantum teleportation (QT), or entanglement-assisted teleportation, is a process for the transmission of information utilising quantum physics to provide a level of secrecy to the information transmitted. QT is sometimes mistaken for a process that can transport matter, this is not the case, and a second method of transmission is required between the sender and receiver of the message to exchange information required for decoding the message, however this channel does not require encryption or secrecy.

Quantum teleportation, or entanglement-assisted teleportation, is a process by which a qubit can be transmitted exactly (in principle) from one location to another, without the qubit being transmitted through the intervening space. It is useful for quantum information processing, however it does not immediately transmit classical information, and therefore cannot be used for communication at superluminal (faster than light) speed. Quantum teleportation is unrelated to the common term teleportation - it does not transport the system itself, and does not concern rearranging particles to copy the form of an object.

.


en.wikipedia.org...

reply to post by RandomEsotericScreenname

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That's a good point, thanks for clearing that up. The way the article words it is a bit misleading, and I make no claims to be an expert. But regardless, superfast information transfer is made possible by this tech, it seems.

reply to post by silent thunder

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No problem.

The only thing that is new here is that they have put the entangled particles at a record distance from each other.

It's the same principle of entanglement that has been shown and proven many times before.

And according to my own theory, entanglement has nothing to do with FTL communication. Also if there really is actual communication between the particles, like entanglement experiments imply, it seems impossible to actually use it for FTL communication, because it always requires a secondairy channel to communicate the measurements, between Alice and Bob.

reply to post by ParaZep

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Because the two photons are 'entangled', it means they both act in the same way, no matter the distance, and the changes are instantaneous and simultaneous, i.e., it takes no time for the information to travel from one to the other.

It even seems that there is no way for info to be travelling between them directly.

reply to post by RandomEsotericScreenname

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If a change in the state of one can be implied by a change in the state of another at a distance, it is information transfer, even if there is no physical transfer. Because information requires a mind to be meaningful, right? The real change is in the brain of the observer. But that doesn't make it any less meaningful.

reply to post by silent thunder

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That is exactly what I've been pointing out lately.

The only "mechanism" that allows the travel of this info is the conscious observer.

Originally posted by RandomEsotericScreenname
reply to post by silent thunder

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That is exactly what I've been pointing out lately.

The only "mechanism" that allows the travel of this info is the conscious observer.

Yes.

And again I will stress this is no less meaningful than physical transfer of a particle from one place to another.

Suppose you had one end of this system on earth and the other near Alpha Centauri, which is 4 lightyears away from earth. A light signal would take 4 years to go from earth to Centauri, and 4 years to return. But with this system, the earth people could make changes in a manner that would create a binary code, say ("on-off-on-on-off-on" etc). This could be used to transmit any information that could be transferred digitally, instantly, rather than in four years each way. This is what is meaningful about it. Of course, the distances on earth are not great enough to make such a difference...even so, however, I can imagine situatiations where it would be meaningful...say, in trying to out-bid an opponent on a stock exchange...even if your quantum signal beats the light-signal by a tiny fraction of a microsecond, you get the trade before your opponent does. Already HFT traders sometimes try to locate their servers physically closer to an exchange like the NYSE because light has to travel a shorter distance and this gives them an edge in finance.

www.wired.com...

Text
White House Denies CIA Teleported Obama to Mars

You can scoff at the idea of Obama on Mars. But it explains a lot. Obviously the birth-certificate controversy is a side effect of Obama forgetting to sufficiently establish his fake identity as he learned to manipulate time and space. (Dugan has a demonstrated record of supporting space travel; the “jump room” must be broken.) And who else but a man accustomed to keeping the country’s most explosive secret would be comfortable waging so many undeclared wars? Ignore Basiago and Stillings at your own peril. If Obama’s reelected, the U.S. is finally colonizing Mars.

reply to post by silent thunder

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And again I will stress this is no less meaningful than physical transfer of a particle from one place to another.

Don't stress, it is even more meaningfull, but not in the way you propose it.

Suppose you had one end of this system on earth and the other near Alpha Centauri, which is 4 lightyears away from earth. A light signal would take 4 years to go from earth to Centauri, and 4 years to return. But with this system, the earth people could make changes in a manner that would create a binary code, say ("on-off-on-on-off-on" etc). This could be used to transmit any information that could be transferred digitally, instantly, rather than in four years each way. This is what is meaningful about it.

You don't have to explain the concept.

Like I said, in order for this to work, it seems that a secondairy, conventional signal containing the info of Alice has to be sent to Bob in order to change the state of the entangled partner at Bob.

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