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Scientists teleport two different objects
Scientists teleport two different objects
POSTED: 4:36 p.m. EDT, October 4, 2006 LONDON, England (Reuters) -- Beaming people in Star Trek fashion is still in the realms of science fiction but physicists in Denmark have teleported information from light to matter bringing quantum communication and computing closer to reality. Until now scientists have teleported similar objects such as light or single atoms over short distances from one spot to another in a split second. But Professor Eugene Polzik and his team at the Niels Bohr Institute at Copenhagen University in Denmark have made a breakthrough by using both light and matter. "It is one step further because for the first time it involves teleportation between light and matter, two different objects. One is the carrier of information and the other one is the storage medium," Polzik explained in an interview on Wednesday. The experiment involved for the first time a macroscopic atomic object containing thousands of billions of atoms. They also teleported the information a distance of half a meter but believe it can be extended further. "Teleportation between two single atoms had been done two years ago by two teams but this was done at a distance of a fraction of a millimeter," Polzik, of the Danish National Research Foundation Center for Quantum Optics, explained. "Our method allows teleportation to be taken over longer distances because it involves light as the carrier of entanglement," he added. Quantum entanglement involves entwining two or more particles without physical contact. Although teleportation is associated with the science-fiction series Star Trek, no one is likely to be beamed anywhere soon. But the achievement of Polzik's team, in collaboration with the theorist Ignacio Cirac of the Max Planck Institute for Quantum Optics in Garching, Germany, marks an advancement in the field of quantum information and computers, which could transmit and process information in a way that was impossible before. "It is really about teleporting information from one site to another site. Quantum information is different from classical information in the sense that it cannot be measured. It has much higher information capacity and it cannot be eavesdropped on. The transmission of quantum information can be made unconditionally secure," said Polzik whose research is reported in the journal Nature. Quantum computing requires manipulation of information contained in the quantum states, which include physical properties such as energy, motion and magnetic field, of the atoms. "Creating entanglement is a very important step but there are two more steps at least to perform teleportation. We have succeeded in making all three steps -- that is entanglement, quantum measurement and quantum feedback," he added. |
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Scientists teleport two different objects
There's a good article about this at:
http://www.sciencenews.org/articles/20010929/fob1.asp My web searches also turned up http://www.csmonitor.com/2001/1004/p15s1-stss.html which I cannot recommend, as it contains a number of fundamental mistakes - for example, about Schrodinger's cat. John Savard |
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Scientists teleport two different objects
Schrodinger's cat?
How do you know he passed away? Well no observation is needed, (when you leave the box lid closed for a few days)! This was the answer I gave in class, (all those beers ago). OASN, I can see that this tech. may become of value for communication & computers. It is worth the effort to continue funding this, (but one should not think we will be beaming about anytime soon). Carl |
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Scientists teleport two different objects
wrote: OASN, I can see that this tech. may become of value for communication & computers. It is worth the effort to continue funding this, (but one should not think we will be beaming about anytime soon). Carl Thank goodness! Think about, would you want to 'Beta Test' a transporter? ;^) Just my $0.02 Space Cadet Moon Society - St. Louis Chapter http://www.moonsociety.org/chapters/stlouis/ There is only one (maybe 2) basic core reasons for humans to go beyond LEO, That is for the establishment of space settlements or a space based civilization. Everything else are details. Gary Gray 11/9/2005 |
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Scientists teleport two different objects
:: OASN, I can see that this tech. may become of value for communication
:: & computers. It is worth the effort to continue funding this, (but :: one should not think we will be beaming about anytime soon). Especially since they didn't "teleport two different objects". They "teleported" information from one object to another. Why they call this "teleporting" instead of "transmitting" is unclear, other than it's what gets the headlines. Wayne Throop http://sheol.org/throopw |
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Scientists teleport two different objects
Wayne Throop wrote:
Why they call this "teleporting" instead of "transmitting" is unclear, other than it's what gets the headlines. Well, it *did* involve quantum entanglement - and that was the excuse. John Savard |
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Scientists teleport two different objects
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Scientists teleport two different objects
RobH wrote: Scientists teleport two different objects POSTED: 4:36 p.m. EDT, October 4, 2006 [fun with quantum entanglement] Am I correct in thinking that this technology is FTL, and not subject to any kind of range restriction or interference/ signal blockage? Can we therefore imagine that some future interplanetary mission might take with it a lump of entangled particles (having left the entangled 'mates' of those particles back on Earth), allowing the spacecraft and mission control to exchange data instantaneously, no matter how far away the craft travels? What would the bandwidth be like? Presumably it would be 1 bit per entangled particle pair, but is there any restriction on the rate at which these bits can be sent other than the speed at which the the computers involved can 'read' and 'write' the particles? However, I suppose there would be a finite amount of data that could be transmitted in this way, defined by the amount of entagled particles available to the ship. What would we call that, 'banddepth'? Given that these particles are at an atomic scale though, I imagine a just a few grams of material would be enough for many billions of bits of data. The advantages of eliminating comm-lag for manned space travel are obvious, but I could see that even on unmanned missions this would do away with a lot of hassles associated with traditional radio transmissions. Or have I misunderstood completely? The only future applications the articles I've read seem to be interested in are secure data communication (very exciting for gov, mil and biz I'm sure but... well.... *yawn* ) and "beam me up scotty" style teleportation (which, let's face it, ain't gonna happen). I find it hard to believe that such a potentially revolutionary technology (a) really is as useful as I understand it to be and (b) isn't generating more of a buzz. Someone please correct my misconceptions (if I have expressed any). |
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Scientists teleport two different objects
Wayne Throop wrote: : : Am I correct in thinking that this technology is FTL, and not subject : to any kind of range restriction or interference/ signal blockage? : : Can we therefore imagine that some future interplanetary mission might : take with it a lump of entangled particles (having left the entangled : 'mates' of those particles back on Earth), allowing the spacecraft and : mission control to exchange data instantaneously, no matter how far : away the craft travels? No. Or rather, you can imagine it (and, eg, Stross did in Singluarity Sky and Iron Sunrise), but there's not much of a justification for it in the theory and practice of quantum so-called-teleportation. Because, in order to accomplish the so-called-teleportation, you must 1) make a measurement at the souce, 2) send a message about what you found to to the destination, and finally you can 3) cause the "quantum state" to "teleport". Note specifically step 2. Oh, OK thanks. Does anyone know of a decent, layman-friendly explanation of how this works? Even the wikipedia article on the subject is full of incomprehensible heiroglyphics... |
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