Skip to comments.Chinese Physicists Teleport Photons Over 100 Kilometers
Posted on 05/12/2012 7:52:50 PM PDT by Innovative
Teleportation, sci-fi-y as it sounds, is actually not fictional or even new; two years ago, Chinese physicists broke the then-current record for quantum teleportation by teleporting photons over 10 miles. But a new effort from that same team demolishes that record, beaming the photons over 97 kilometers.
The physicists, working from the University of Science and Technology of China in Shanghai, have again taken advantage of quantum entanglement for the purposes of moving an object from one place to another without ever moving in the space between. According to Technology Review, "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."
The task uses a 1.3-watt laser "and some fancy optics" to beam those photons and retrieve them at the final location. The trick seems to be maintaining the photons' information, since the beam widens over space, but eventually teleportation of this sort could be used to beam information incredibly quickly up to satellites.
(Excerpt) Read more at popsci.com ...
“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.”
I’m an economist not a physicist but this doesn’t sound like teleportation to me. Rather it is the transmission of information not the transmission of an object.
Will someone more enlightened inform an ignorant economist what I’m missing?
I take it as an advanced copy of something.
I could inform you, but I would have to charge you...
I believe you’re correct. Quantum entanglement allows 2 entangled particles to have the same “information” regardless of how far apart the objects are. I have no clue how or why it works, and am not sure anyone else does either - but it’s not teleportation in the Star Trek sense.
go to the Technology Review link I posted in my post 1, they have more explanation.
But basically something is in one place, then the same/or at least identical something appears at a different location, without it having actually having moved there by moving through the space between the two location.
Hi, I am here at point A.
Next I am calling for you from point B, without actually being observed on route from A to B.
There is no spoon...
Don’t many photons look alike?
Famously referred to as "spooky action at a distance."
Just think of it like Internet Porn.
This is not good. Not good at all. This might give the ChiComms unbreakable communications encryption. Hopefully NSA is already past this point and working on ways to disrupt this kind of communications encryption. The ChiComms are known for selling their MILTech to rogue nations, terrorists and Narco-smugglers, so this could be a game-changer on many fronts if they figure out how to field this.
What... are you racist?
(: o )
Maybe photons are neither particle nor wave, but the pattern produced by the intersection of waves.
I'm not sure but doesn't that imply the transit time from 'A' is 'B' zero? That would be very hard to measure since our instruments are bound by light speed, in any event it would allow the transfer of information at intergalactic distance faster then light speed, yes?
SETI calling on line 2...
Are you Speedy Gonzales? Andelay! Andelay!
My stomach when I got dysentary in the jungles of Guatemala?
Oh, well, of course “photons”. Wake me up when they start teleporting neutrons! (or Volkswagon Beetles)
There is a sleight of hand involved here. What is done is that the state vector (colloquially, and less correctly, called a "wave function" by some) of a photon at distance is entangled with the state vector of a nearby photon. By manipulating the state of the near photon, a change in the state of the remote photon occurs. Because photons (actually all quantum particles) are indistinguishable, the state change reflected in the remote photon is identical to the appearance of a "new" photon with the same state.
However, since an observer at distance cannot know the state of our "nearby" photon (which is remote from his point of view) without exchanging state descriptions with us, there is actually no information being transmitted until an ordinary radio transmission (or pony express rider, or some other conventional information process) actually verifies the content. Roughly, the particles "know" they have been changed ("spooky action at a distance," in Einstein's words) but this knowledge cannot do anyone any good until ordinary messages can be exchanged.
This is the position of orthodox physics. It is not controversial, although there are a few (actually respected) dissenters who claim information can be exchanged in this way. But they have never constructed an experiment that shows how.
This article http://en.wikipedia.org/wiki/Quantum_teleportation does not completely suck, even though it is from Wikipedia. If you are very interested, also have a look at the Einstein-Podolsky-Rosen Paradox which is the original paper that got people thinking about the question of quantum entanglement. Both of these articles are accessible to an intelligent layman. The article on the EPR paradox is the better of the two. Interestingly, Einstein, Podolsky, and Rosen believed their "paradox" would overthrow Quantum Mechanics.
They were mistaken; it is not a paradox. It is the way the universe actually behaves.
If you want to follow this rabbit quite far down the hole, the issue was resolved (to the current state of our knowledge) by Bell's Theorem. Have a look there if you are an economist with a decent mathematical background and some time.
But I have often thought the simplest way (ha, that's an oxymoron) to do such was gather all the information down to the subatomic structure of an object, transmit it and reconstruct a clone of the object elsewhere. IE: a clone
They do not have the same information. They have complementary information.
It is well understood, and has been since 1937. No physics graduate student can pass a doctoral candidacy or comprehensive exam without being able to explain it.
It is teleportation in the Star Trek sense, as explained by James Blish in the novel Spock Must Die in 1970. [Blish wrote a number of Star Trek episodes and adapted the teleplays into anthologies in at least two books.] His very nice description of how the teleporter works, and how it involves the material destruction of an individual in the transporter room accompanied by his material reconstruction at distance is both quantum mechanically correct (at the level explained) and metaphysically interesting.
I believe NOTHING that comes out of China.
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