Quantum Teleportation achieved !!!
Posted on: June 6, 2010 - 2:17am
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Quantum Teleportation achieved !!!
I was watching Book TV,and the speaker said that the Chinese scientist had achieved Quantum Teleportation,but most people did not here about it,cause the TV show "Lost" last episode was more important to most of the people. www.physorg.com/news193551675.html
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Hi Ken. Are you willing to step into the machine right now in the hope that the other end happens to be Venice? Not going to happen.
Will the science become technology in the next several years and be way cool? Yah sure.
The thing here is that this will not mean all that much for common stuff. Will a future computer be able to handle 2=1+1 faster? Not really. Will it render the most carefully crafted password stupidly simple? Again, not really.
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You'd think the major early applications will be comms. Beats wireless. Is there an RFI/EMI hassle with transmission of data between entangled photons? You'd assume no possible issue with Farraday effect. Is this photon Q transmission line of sight?
"Experiments are the only means of knowledge at our disposal. The rest is poetry, imagination." Max Planck
Well AE, you raise an interesting point. Let me rephrase that:
Will there be an issue with noise?
We are at the very early stages of research on the matter. The best answer to my version is only a good guess and could well be wrong.
In all honesty, I don't know if RFI is even a valid comparison. However, I can run with that for now.
In the early days of radio, there was an idea of the wireless telegraph. It used a spark gap as the transmitter. By modern standards, the signal is noise. It was good enough for the time though.
Let's say, just for grins, that you are at home trying to listen to a classical concerto on your radio. I am next door using a spark gap transmitter. I don't think that it is a stretch to conclude that you are not happy with me.
So your question becomes something like “are entangled photons subject to noise?”.
Well, umm, hmm.
Two possible answers:
First, they are entangled, so no.
Second, Planck level effects are possibly relevant. So yes.
So I don't see that there is likely to be an RFI issue. The better question is are there going to be issues? Honestly, I don't know and I think that possibly nobody else knows either.
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That's not what this is: this is really only applicable to cryptography.
Teleportation of matter may never be possible; if it is it would involve isolating two spacial dimensions of the wave from the third, and confining the others so exactly (fractions of a degree Kelvin) to the extent that the third propagates across vast expanses of space. The entire expanse, however, would have to be a vacuum at such an incredibly low temperature so as to prevent the function from collapsing again- then at the other end, one would deliberately collapse it.
This may or may not be possible- even if it is, it's pretty far off for anything save helium (and that's assuming we can even really get that low of temperatures, biasing it to only two dimensions).
No, but quantum computation (not what this is about) will demolish public/private key encryption and make this necessary. Encryption based on entangled quantum noise will be pretty much unbeatable, because the key can't [currently] be snatched without interfering with it (so any snooping would be detectable).
Packet loss, yes. If that is how you define noise- but this is all digital, so that only speaks to transmission rate.
Strictly speaking, all of this quantum "data" is just noise; a classical signal still needs to be sent to make sense of what to do with it. All that this all amounts to is "random" digital noise that shows up in exactly the same way on both sides (thus why it has uses in cryptology, as keys).
Eep; I may have spoken too soon:
http://www.physorg.com/news10924.html
Depending on how the qbit is being sent, it looks like high-tech spies may be able to snoop on a quantum channel without detection. I imagined it was theoretically possible, but I did not realize we had this technology yet.
May be a few years off for practical application. The cryptography battle wages on, eh?
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I don't know what's scarier: the fact that Supernatural will not make season 7, or that I actually understand everything you wrote here.
Logic is a systematic method of coming to the wrong conclusion with confidence.
Whatever issues there are would differ from wireless. Was projecting some of the issues I've seen with open air links onto a totally different technology. At present in the case of the integrations I'm thinking of, mesh has been the best option, but the idea of point-to-point links that are free from the usual wireless problems is really appealing. For instance, one entangled photon 2km underground in a mine and another in a control room at the surface. Lol. Imagine the savings on cabling. It's bending my head trying to comprehend the encoders.
"Experiments are the only means of knowledge at our disposal. The rest is poetry, imagination." Max Planck
Listening to a podcast today ( "Quirks and Quarks' from CBC Radio ), they interviewed a scientist about this stuff.
I gather that if you have a pair of quantum entangled particles, in two widely separated locations, you can interact one particle with another local particle, send information describing this interaction back to those holding the other entangled particle by normal 'radio', which will allow those at that end to apply some process to their particle which will effectively turn it into a duplicate of the local particle at your end, effectively teleporting it.
http://www.cbc.ca/quirks/
That episode also has a nice piece about human irrationality.
Favorite oxymorons: Gospel Truth, Rational Supernaturalist, Business Ethics, Christian Morality
"Theology is now little more than a branch of human ignorance. Indeed, it is ignorance with wings." - Sam Harris
The path to Truth lies via careful study of reality, not the dreams of our fallible minds - me
From the sublime to the ridiculous: Science -> Philosophy -> Theology
Ok, this is all fine and dandy. But if I see one comment on "transporters" I am going to get a lip twitch so bad it will set the Richter scale off the charts.
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Hey, maybe I can transport over to your house, or you can transport here. All we need is an advanced physics lab at each end....
Favorite oxymorons: Gospel Truth, Rational Supernaturalist, Business Ethics, Christian Morality
"Theology is now little more than a branch of human ignorance. Indeed, it is ignorance with wings." - Sam Harris
The path to Truth lies via careful study of reality, not the dreams of our fallible minds - me
From the sublime to the ridiculous: Science -> Philosophy -> Theology
Yep. It's kind of counter intuitive, as to why they named it "teleportation", because it's more of a "recreation" on the other end (the original still exists, and no information was ever sent non-classically). It just so happens that recreation, in the quantum sense, is exact in all possible ways.
Unfortunately, science writers usually don't know enough about science to avoid being confused by this, so the way the media puts it, they make it sound like information was magically sent by entanglement (which violates relativity up and down), and something was actually magically transported to another place.