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Quantum Teleportation Achieved Over 16 km In China
Laxori666 writes "Scientists in China have succeeded in teleporting information between photons farther than ever before. They transported quantum information over a free space distance of 16 km (10 miles), much farther than the few hundred meters previously achieved, which brings us closer to transmitting information over long distances without the need for a traditional signal."
I never got any of this newfangled philotic physics. Half of it nobody understands anyway.
... I might stop having Cablemodem issues? Sexy!
Buanzo Consulting - 15 Years of GNU/Linux experience, for you.
China is leapfrogging the rest of the world.
Say what you will about human rights, but their adaptive central planning strategy is showing results and the average citizen is too busy with getting in on the economic growth to care much about freedoms.
http://xkcd.com/465/
Unfortunately, what they transmitted was an email for Vi4gra, using an open wifi connection at a Starbucks 10 miles down the road.
Tequila: It's not just for breakfast anymore!
Before you think this is awesome, this is not an ansible, information is transmitted at lightspeed only.
why does it take that long to get it working ? didn't take scotty that long to figure it out ;)
Chinese scientists merely wrote another fake paper, as is the common practice in Chinese academia:
http://www.chinadaily.com.cn/english/doc/2006-03/15/content_536821.htm
http://www.china.org.cn/china/life/2009-02/04/content_17222202.htm
http://search.yahoo.com/search;_ylt=A0oGkm5hk_VLFq4AU84qk6B4?p=as+china+academic+cheating&fr2=sb-top&fr=404_news&sao=0
Not until they do it over the USA or even France, but not over China.
10km is a good distance. However, if one could be able to both do quantum information across longer distances, and with a decent bandwidth, this would change communications as we know it just like fiber optic cables. Some examples:
Mars rovers could be controlled in real time -- no 4 hour lag time.
Astronomy experiments could be done by sending instruments out and being able to observe items with a large virtual radio array in real time.
Internet routing would be revolutionized -- it only would be the router's CPU speed that would be the latency limit, not distance.
With real time control of robotics even if they are on another planet, this would allow us to mine, but yet have a human operator on duty that can respond quickly if something happens in the cave -- no need to trust an AI 100% of the time.
They stole the idea from Star Trek.
Tequila: It's not just for breakfast anymore!
Isn't it impossible to transmit information via quantum entanglement? Since you cannot determine the state of an entangled particle, you cannot use it to "transmit" information until after you let the other end know, through conventional channels, what each possible state actually stands for. If that's the case, how exactly is this "quantum information transfer" supposed to work.
"In prison you just have to shut your eyes and take it. Here you have to shut your eyes and give it."
http://science.slashdot.org/story/10/04/19/0132246/Chinas-Research-Ambitions-Hurt-By-Faked-Results
This story alone makes me skeptical about any major scientific breakthroughs until someone can peer review the results.
Congrats to the hardworking people on the project, however I will be applauding their work with less skepticism when I hear that MIT, Cornell, CMU, etc confirm the results.
In what way are photons travelling down a fiber not a traditional signal? Sure, they are entangled, but you still have to ship photons around.
Put my fist through my alarm clock with its ding-dong death inside my ear. - The Blackjacks.
The message "Hello kitty" oddly enough was received as "Kitty Alive/Kitty Dead".
Monster Cable will find someway to exploit this, of course with enough shielding to protect against a nuclear blast and the heat of the sun.
We should start a new Slashdot and return control to the geeks. It actually wouldn't be that hard to get some users to
Why is TFA contradicting itself? A traditional signal is always needed, that's one fundamental principle of quantum comunication.
Happens all the time. Mainland Chinese have a huge thing about "face" and prestige, but evidently, it doesn't extend to not lying and stealing compuslively to make yourself look better. Their little brains don't understand that you lose a LOT of face when everyone sees you as a liar and thief.
Sure you can determine the state of a particle. You can do something that will change its state in a predictable way. Then the other particle, which you haven't changed, changes at the same time.
Which brings us to the question of Relativity: Since there is no such thing as simultaneous time in the universe, per Einstein - that is, what's simultaneous from one perspective is sequential from another - when does the untouched-but-entangled particle change state to match the one we've acted on in a determinative way?
"with their freedom lost all virtue lose" - Milton
You still need a classical signal. Information still cannot be transmitted faster than light.
It's possible there are esoteric uses for this if it could be scaled up dramatically in terms of the sophistication of the state transmitted, and this could matter for quantum computer communication some day, but I fail to see any real use for quantum teleportation today.
I do have a BS in Physics, but that was 15 years ago and I have never done physics professionally - I got sucked up by the nice pay and abundant job market for programmers.
Don't feel bad, this is a pretty common mistake. People read about non-locality and how what happens to one half of an entangled pair affects the other half instantly no matter how far away it is. There does remain some philosophical debate over what entanglement and non-locality really are, but one thing has been supported very well by both theory and experiment: You can't transmit information or power faster than c. In the case of entangled pairs, actions on one half can have a non-local effect that propagates faster than c, but it's not possible to transmit information or power using that effect. In order to make sense of the results and actually observe the effects of non-locality, you typically need to send additional information classically.
So, this will not lead to lag-less communication over vast distances. What it will lead to is quantum crypto networks. Long distance entanglement swapping or quantum teleportation are one of the key ingredients to building a scalable network.
"Scientists in China".
Think I'll be waiting for independent verification of this one then...
If you try to fail and succeed, which have you done?
Is it possible to generate the needed information in advance?
QbitTorrent is going to give a few industries some serious headaches, good luck tracking and snooping on free space quantum teleportation.
And the ideas of Star Trek is to move earth civilizations, including China, to other planets.
Does anyone knows the distance between the US and China? Xièxiè
Apparently there are liars and thieves everywhere but the thing in China especially is a lack of respect for intellectual property. Many just don't see it as severe as stealing physical property. But it will get better just like the Americans did. There was a time when Charles Dickens angrily accused Americans of stealing, and of course Americans' big brains don't remember that nowadays.
The summary is completely messed up.
Quantum teleportation doesn't have anything to do with quantum communication.
I still don't get it. Could you use a car analogy?
46137
The idea of any organism is to multiply and spread to new areas, whether we are talking about humans, viruses, bison or trees.
Tequila: It's not just for breakfast anymore!
Could you elaborate?
In that entanglement is the very basis of quantum communication, I'd say it has a fair bit to do with it.
I thought it was a musician who plays any type of organ.
The idea of any organism is to multiply and spread to new areas, whether we are talking about humans, viruses, bison or trees.
The only known exceptions to this are Liberals who enthusiastically abort their prodgeny.
Apparently there are liars and thieves everywhere but the thing in China especially is a lack of respect for intellectual property. Many just don't see it as severe as stealing physical property. But it will get better just like the Americans did. There was a time when Charles Dickens angrily accused Americans of stealing, and of course Americans' big brains don't remember that nowadays.
Huh? We're not talking about intellectual property here, you goofball, we're talking about intellectual honesty. Whether or not American publishers ripped off Charles Dickens is irrelevant in this context. Matter of fact, the public-at-large benefited by that violation of copyright law: it was only Dickens and his publisher that lost out. Conversely, when scientists are dishonest and lack the requisite ethics to perform good science, we all lose. Not that I'm picking solely on them: our efforts suffer from politics as well, however we seem to get more spectacular examples of scientific fraud out of China. Their cultural imperatives seem to be a disadvantage here.
... on the other hand, this may just be a way to sabotage our researchers by making them waste their time trying to reproduce the un-reproducible.
For their sakes I hope I'm wrong because they'll find themselves heading down the garden path if they don't do something about it
The higher the technology, the sharper that two-edged sword.
"which brings us closer to transmitting information over long distances without the need for a traditional signal"
Its unfortunate but those good ole "Traditional signals" are the only ones which convey useful information.
What a jerk. Am I supposed to argue with you?
What a jerk. Am I supposed to argue with you?
Nope. I like to spew forth and let people bask in the glow of my overarching wisdom. Or something like that.
The higher the technology, the sharper that two-edged sword.
OK, You are just a little delusional.
I was replying to someone calling the Chinese compulsive thieves. So I was not off topic. If you don't think so, don't reply in this thread.
I've argued with others about this "Their cultural imperatives" before. That's why I dug up this Dickens thing. Look it up on the internet how the American public received Dickens' criticism and you will feel the limit of your understanding of cultures.
Where'd they find 'free space' in China?
http://i49.tinypic.com/14mf8uv.jpg
Still waiting on Serviscope_minor to wake up to fucking reality and realize that Jessica Price isn't going to fuck him.
This would be very handy for activating an aggressive nano-bot swarm delivered to the US via Wal-Mart stores.
Take the Red Pill.
lollll...a reputation for exaggeration, intellectual theft, and grandiose lying could be a very useful thing...if you do happen to have a top secret project running and somebody breaks security, nobody "outside" will believe it...until you demonstrate it, and that point is the far side of too late.
Orwell: "In a Time of Universal Deceit, telling the Truth is a Revolutionary Act"
one thing to remember, china has a history of faking science achievements. until others can verify this i will take it with the grain of salt that it deserves.
"The Asian crisis was a turning point in that sense," says Brookings Institution senior fellow Homi Kharas, who studies the new global middle class. "These countries began pursuing liberalization in their own way, at their own pace, and they've done well. Now they see their success as the fruit of their own efforts," even though it was attained under global systems of free trade and finance set up by the West.
When someone is gently tugging your dick, keep your hand on your wallet. China and India have been successful because they did not adapt Western financial values. Ditto for Brazil and any other country who was large enough to avoid being pressured into the Chicago school of self-destructive economics. Since 1980, the Western world has been destroying markets and free trade by eliminating regulations and fairness - the only things that keep a market competitive, just as a vibrant independent press is that only thing that keeps democracies truly free.
China will soundly destroy the American economy because 1) it's still developing and four times our population, 2) it's typically not imperialistic outside it's own borders, and 3) it's not being run by a voting bloc which believes literally that the earth is 6,000 years old.
Our founding fathers decried Europe for being chained by the monarchist traditions and the shackles of dogmatic religious squabbling. Well, guess who the new Europe is. We just traded Monarchy for Corporatism.
In scientific research that will only get you more scrutiny. In the military, the way to go is to set up a few fake secret projects and let others guess or even lead others to do stupid things in response.
So anyone who uses the transporter will end up being mixed up with lead and cheap plastic.
I've got better things to do tonight than die.
Methinks expecting China to do what we would do - or worse, to expect China to do what we have already done - is...myopic.
Orwell: "In a Time of Universal Deceit, telling the Truth is a Revolutionary Act"
Isn't quantum teleportation only possible by using a traditional channel to transmit the quantum state of the particle?
IANAP, but as I recall this was why quantum teleportation is not able to transmit information faster than light.
16km, while impressive, is not the record. The summary is completely wrong. Ursin et. al. did it over 144km in 2006, and have plans to do it via satellite (with interesting implications about whether it works through a changing gravity well, and so on).
There's particle A and particle B, and they're entangled.
We put particle A in Argentina, and particle B in Belgium.
Alice in Argentina pokes particle A using every tool known to science.
Is there any way for Bob in Belgium, who is staring at particle B with every instrument known to science, to tell that particle A has been disturbed?
If yes, FTL communication! Yay!
If no, well... what are they good for, then?
Unfortunately, my proof is too large to fit in this forum post.
Is it really too large, or are you just afraid that once your theory is observed it will no longer hold?
"I don't care about the Constitution!" --Bill O'Reilly, November 17, 2009
If your statement is true, then I'm back to square one on understanding this "entanglement" thingie. Actually, I never really quite made it to square one, but still...
You're barking up the wrong tree if you're trying to understand....even the master himself said, "nobody understands quantum mechanics."
"I don't care about the Constitution!" --Bill O'Reilly, November 17, 2009
Measuring at different times doesn't appear to matter (See Wheeler's Delayed Choice experiments). Which is very amazing in itself and an entirely different topic of discussion. The problem is that however you set up your experiment, no practical information is exchanged FTL. Alice could measure the entangled pair at the same interval as Bob, but that doesn't really tell her anything since Bob can't actually cause his entangled particle to have a particular spin, polarization, or whatever they're measuring. It's only interesting after the fact when they compare notes.
So you say well then, instead of using the particles let's use the act of measuring or not to transmit info. If Bob measures his particle he's sending a 0, if he doesn't he's sending a 1. And Alice will see this reflected at her end somehow. But the problem with this, from my understanding, is that everything is going to look random to Alice however she chooses to measure it (or however they agree to ahead of time). Because remember you are looking at individual particles. Again, it's only interesting after the fact when they compare notes.
Now the question I am not sure the answer to, is if they were to use a group of photons and either measuring or not measuring the group as a whole. For example, if you think of the classic double slit experiment, doing something to an entangled set of photons to cause their distant pairs to either form a wave-pattern or a blob on a detector. I don't know if this is possible or not, and it sounds like there might actually be some serious debate about this (see Dopfer experiment)
The sending of this message pretty much inconveniences everyone involved.
You know, I'm just not ready to believe it when China says something is "over 16". They've told that lie before.
Yeah, I'll believe it when someone other than China peer reviews it
but no one was there to hear it. Would there still be information? Ah, the philosophy of quantum physics. I know nothing about physics, ever had a class. After reading 238 postings on this topic, I still know nothing but feel like I am in good company.
Well, we all know chinese "science" is faked quite often. E.g. : http://www.news24.com/SciTech/News/China-warned-over-fake-science-20100107 and so on. How to make sure this is not just yet another bullshit from them?
But at least it probably goes up to 11.
That was my first thought too. Along with North Korea successfully building a fusion power plant. Just makes them look like idiots.
This is no breakthrough. In Spain it was done over 144 km between two islands. How come the original poster ignore this fact? Here, a link: http://www.quantum.at/research/quantum-teleportation-communication-entanglement/entangled-photons-over-144-km.html
As usual, China is well behind the western world but they claim to have discovered something for the first time. And the problem is... we believe them
I can see a lot of uses in real teleportation:
news at 11, teleportation DRM by Microsoft, Safe or not?
--- I am known for the ones who want to find me on the net. Is that a privacy risk or a privilege? One might wonder..
That one has already an arrow to define the direction flow of quantum data passing the intersingular relais, which will be cheaper in the end.
--- I am known for the ones who want to find me on the net. Is that a privacy risk or a privilege? One might wonder..
people are saying that 'some' change is measured faster than the speed of light just that that change can't be interpreted until other information is transmitted at the speed of light. as long as you are able to measure some change, what stops you from lining up a row of entangled particles and interpreting them as binary? 'some' change is a 1 while no change is a 0. then couldn't one transmit information faster than the speed of light? i wouldn't pretend to understand the mathematics involved in such a thing but from the general knowledge i have gathered on the subject and from the responses of people who claim to be knowledgeable this seems like a reasonable application of this ability.
Unfortunately, this research is from China, which in today's world means there is a very good possibility their data and results are falsified. It's amazing how much Chinese research is bogus just so the country can get recognition as a phony scientific superpower. You really can't trust it without taking a really in depth second look at it.
When they can teleport people from one continent to another.
If Google really cared they would fix Android Chrome to reflow text, instead of discriminating
The comparison data still must travel via classical means making quantum teleportation practically useless.
Is this a sign that scientific cooperation, er, apprenticeship under Kim-Jong-Il is paying off already ?
=8-^
I agree with the others that Chinese academics tend to be unreliable to put it nicely, and Spain's claim is much better. As to how it works for communications, if you remember your chemistry, this works equally well for electrons as photons. Take two hydrogen atoms, and if you entangle their electrons, one electron will have a quantum state of: n=1, l=0, m=0, and s= +1/2 and the other electron has the quantum state of: n=1, l=0, m=0, and s= -1/2. Once they are entangled, if you change the s-state on the first electron to s= -1/2 the s-state on the second one will immediately change to s= +1/2 regardless of its location, and if you change the s-state on the second electron the s-state of the first electron immediately flips. The trick to communications is you need something that can read the s-state and change it on both ends. Then you code one end to read +1/2 as 1 and -1/2 as 0 and the other end the opposite way, you can send and receive any digital information almost instantaneously, regardless of the distance. Bill