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Open-Destination Quantum Teleportation
Roland Piquepaille writes "An international team of physicists has entangled five photons for the first time in the world, reports Technology Research News in "Five photons linked." Why is this important? Because it's the minimum number of qubits needed for universal error correction in quantum computing. In other words, they found a way to check computational errors in future quantum computers. The physicists also demonstrated what they call 'open-destination teleportation,' a way to teleport quantum information within and between computers." "They teleported the unknown quantum state of a single photon onto a superposition of three photons. They were then able to read out this teleported state at any one of the three photons by performing a measurement on the other two photons," adds PhysicsWeb in "Entanglement breaks new record
". This will be used in about ten to twenty years to move information among quantum networks. You'll find more details and references in this overview."
Blah Blah Blah Blah,Blah,Blah, You have the bridge #1.
oh man... please stop... I dread reading the replys to this story... so so many people not understanding will come up. its not faster than light communication... I promise...
-You're wasting your time. Alfador only likes me.
Yet another lazy article submitter copies the article verbatim and gives no credit.
Ok... so when do I get to stroll downstairs in the morning and say "Energize" to some guy standing at the controls of my transporter pad to get to work, rather than driving?
Professor: No fair! You changed the outcome by measuring it!
I'm going to bed.
Enterprise, one to beam up.
liqbase
As far as I'm aware, this does NOT mean anything about downloading files, or any crap like that. When it says moving data across a quantum network, they are referring to a Beowulf cluster of sorts, for data processing. Please correct me if I'm wrong, my quatum computational theory is a bit rusty.
Of course, during upload their body would have been destroyed. Anyhoo, it sure will suck to have been the last person to think they had to die.
And that, is the point of this article. Fodder for postings such as this. Etc.
[And yes, I did have to use a spell-checker to get "consciousness" right, what are else computers for, if not for spelling?]
This issue is a bit more complicated than you think.
Open-Destination Teleportation...wasn't this already tested with success? Yea, I seem to remember a story about this. Something about all hell breaking lose and killing all the Marines/scientists that were working on the project though...
...I empathize with Barbie. Math is hard.
======================================
Writers get in shape by pumping irony.
The physicists also demonstrated what they call 'open-destination teleportation,' a way to teleport quantum information within and between computers."
See honey, I wasn't lying when I told you I knew nothing about it!
One of those physicists must have teleported that donkey porn onto my computer!
Opinions on the Twiddler2 hand-held keyboard?
For those of us who failed High School physics, from Wikipedia: A qubit (quantum + bit; pronounced /kyoobit/ [1] ) is a unit of quantum information. That information is described by state in a 2-level quantum mechanical system.
To be perfectly honest, quantum computing scares me to some extent. Things like PGP encryption and other very sensitive operations could, quite literally overnight, be blown away and dangerously shift power quickly. Then again we will also usher in a new age of unlimited (well, from a 2004 perspective, matter itself ultimately has a limit for storage and processing) computing that can make engineering in all fields like nothing we have seen before. And, the best part, we will see it in our lifetimes.
In quantum teleportation, complete information about the quantum state of a particle is instantaneously transferred by the sender, who is usually called Alice, to a receiver called Bob.
So, this would only be useful for sending information about a quantum state to guys named Bob? The quantum state thing is limiting enough, but c'mon ... Bob?
Well, tell you what. I'm changing my name to Bob. If you can't beat them, join them. I mean, these guys will be the information uberlords of the future. People will queue up to them, asking 'Did anything come for me yet?' And they will go, like, 'Show me the money!'
The Bobs of the future will be ultra-popular and rich.
...
Yes, I haven't taken my medication today? Why do you ask? :P
I hear there's rumors on the Slashdots
"they found a way to check computational errors in future quantum computers."
Just how far in the future will we be able to check? Should be a great aid to debugging! But what happens if I fix a problem that causes my great grandson to come back in time to help me to meet my wife? Oh, wait.
The ability to transport or "beam" a light photon used in quantum computing is not nearly as complex as even a grain of sand, let alone transporting a person. I light photon already is pure energy, not really matter (in the sense needed to compare to a person.)
Transportation like on star trek is a long ways off... however we are on trak for the star trek universe... transparent aluminum in 20 years according to scotti when they went to 1985 earth... we've discovered it now...
I'm still waiting for my sub-etha radio, and my kill-o-zap. (Lets see if you can get the reference)
DarkMantle I been bored, so I started a blog.
As with nanotechnology, I'll believe in quantum computing when they produce some real results, like say factoring RSA 2048. Hell, let's see them factor the number 339. If practical quantum computing is decades away, can't they at least show us something impractical, just to prove that quantum computing isn't just hand-waving bullshit?
I hate the 'Teleporting' part always associated with this concept... Marketing in science? Weird, but it works... just look at the 'Nanotechnology' craze. 'Nanomachines'... yeah right, just call them proteins already! 99% of grants I saw associated with nanotechnology had to do with proteins used in a way or another, which we've been doing for >30 years anyway. Far from the nanotubes-based nanomachines that are supposed to 'repair' our cells, right? Buzzwords! o_O
Eureka Science News - automatically updated
What we don't know about quantum physics would float many battleships.
What we may be seeing is the physical evidence that space and time are not much at all like we think they are.
Entanglement seems to allow things far away from each other, that used to be close to each other, to react to each other like they are still close to each other.
Science fiction fans will understand that the most likely explanations for that kind of thing are also likely to be wrong.
I look forward to a better understanding of this kind of behavior because it will allow us to better manipulate and control the way our area of the universe works.
For those who think of this as star trek blek, try putting yourself in the place of someone 200 years ago who was told that someone who lives in England would be able to visit someone in the colonies by a trip of only 3 hours.
dzimmerm (who is at work and whose account does not seem to recognize his password and who does not have any way to pop his home email from work due to SPIT, filtering, and SPIT lotus notes)
But it sounds a whole lot like Ender's Game. When will I be able to buy an Ansible from my local radioshack?
I regularly report MSN spam to the Hotmail admins.
In 1993 an international group of six scientists, including IBM Fellow Charles H. Bennett, confirmed the intuitions of the majority of science fiction writers by showing that perfect teleportation is indeed possible in principle, but only if the original is destroyed. In subsequent years, other scientists have demonstrated teleportation experimentally in a variety of systems, including single photons, coherent light fields, nuclear spins, and trapped ions. Teleportation promises to be quite useful as an information processing primitive, facilitating long range quantum communication (perhaps unltimately leading to a "quantum internet"), and making it much easier to build a working quantum computer. But science fiction fans will be disappointed to learn that no one expects to be able to teleport people or other macroscopic objects in the foreseeable future, for a variety of engineering reasons, even though it would not violate any fundamental law to do so.
In the past, the idea of teleportation was not taken very seriously by scientists, because it was thought to violate the uncertainty principle of quantum mechanics, which forbids any measuring or scanning process from extracting all the information in an atom or other object. According to the uncertainty principle, the more accurately an object is scanned, the more it is disturbed by the scanning process, until one reaches a point where the object's original state has been completely disrupted, still without having extracted enough information to make a perfect replica. This sounds like a solid argument against teleportation: if one cannot extract enough information from an object to make a perfect copy, it would seem that a perfect copy cannot be made. But the six scientists found a way to make an end run around this logic, using a celebrated and paradoxical feature of quantum mechanics known as the Einstein-Podolsky-Rosen effect.
Read just how this effect works, here.
You are missing something. This has got nothing to do with faster than light communication, instead it's on how they were able to successfully entangle 5 photons, which is the minimum number needed to implement a universal error correction system in quantum computation.
Teleportation was achieved a long time ago by a bunch of folks at Innsbruck, led by Prof Anton Zeilinger.
And you call yourselves nerds!
Thanks to quantum computation and teleportation, this is actually the first post.
rewriting history since 2109
Given the patent fiasco of the internet (just add "e" to anything and receive a free patent), now is the time to create prior art for quantum computing and publish all the ideas for adding "q" to everything. Only by striking first and getting innovation in the public domain can we have true open and unencumbered standards.
And as long as wide spread adoption of quantum computing is more that 17 years away, companies can't read this message and strike first (prepatenting these ideas first). If companies patent ideas too soon, the patent will be dead when the real money is being made.
Two wrongs don't make a right, but three lefts do.
i guess i'll have to wait a few years for that bagel and cream cheese. i wonder if this will drive down the price of caviar, which would no longer require all the shipping overheads. wait, but this brings up a new question. how does teleportation affect the taste?
As I understand it, the 'information' moves instantly (FTL), but the ability to read it doesn't, hence no faste-than-light violation.
"A language that doesn't affect the way you think about programming, is not worth knowing" - Alan Perlis
Is there a theoretical physical distance limitation for how far two entangled particles can be apart sptatially? Just wondering if this technique could be used for communications where no one would be able to intercept your broadcasts, or even know that you were broadcasting (such as with radio waves).
Thx
Because it's the minimum number of qubits needed for universal error correction in quantum computing
Well, the smallest error correcting code that can protect againt a single error requires five qubits. To actually do error correction you need quite a few more.
:wq
On my systems three Q*berts is not sufficient for error correction in my simulations. Coily always gets me sooner rather than later.
you can read about Roland Piquepaille's spamming activities in this overview
remember his plagiarism earns him 400$ a month per advert so thats why he cut and pastes articles, why write your own when you can steal for free
slashdot editors dont give a shit so you will just get more crap while the real writers get nothing
In one hour? To quote from the article, "Quantum computers have the potential to be blazingly fast because a string of quantum bits, or qubits, that store the ones and zeros of computer information can represent all the numbers possible within that string at once."
In other words, in the time it takes you to transfer a single porn movie, you can simultaneously transmit _every_ porn movie of the same size or less.
Now that's a lot of porn.
When physicists say "teleportation", they are describing the transfer of key properties from one particle to another without a physical link. Researchers from the University of Vienna and the Austrian Academy of Science used an 800m-long optical fibre fed through a public sewer system tunnel to connect labs on opposite sides of the River Danube.
I've actually wondered about this in a few QT articles. The picture I get from reading about it, you could entangle photons across the planet and transfer state between them instantly. In many articles, like the one quoted above, they say in one sentence teleportation transfers states without a physical link, but in the next, describe a physical link used in the expirement. Could some quantumly-entangled slashdotter explain this to us unwashed Newtonian masses? Are the "wires" optional?
Quantum teleportation is akin to faxing a document and in the process destroying the original.
[Scene: RIAA Headquarters]
Mitch Bainwol: "This quadrant teleportation thing sounds too good to be true."
Cary Sherman: "Get me Orrin Hatch on the phone. We need mandatory quantum teleplantation by 2010."
I was always told Quantum Entanglement could not be used for faster-than-light communication because the results yielded gibberish- you couldn't actually send a proper message.
With error correction you should now be able to do this. So, my question is, if you can send a message between two points instantaniously, why could you not do this between say, A spaceship heading to Alpha Centauri and Earth?
They didn't really know the dangers of nuclear power when they started messing with it. The first nuclear reactors were built right under campus stadiums. What if quantum computing messes with or pollutes something we don't know about yet? Maybe there is "probability pollution" or something.
:-)
Hell, it might be decreasing further the chances of nerds getting dates or something
Table-ized A.I.
So here's the idea - quantum entanglement is when you have two quantum states that have to be given in reference to each other, even though the two states maybe contained in elements spatially separated.
:)
But - no useful information can be transmitted between the two systems. This is because the information in itself is given by probabilistic superposition of the states. For instance, you have a Qubit defined as the superposition of states, given by |psi> = a|0> + b|1> - so you can only find out when they are absolute states (0) or (1), and not in between -- and that will not happen at speeds less than the speed of light. In order to find out what state the system is in (in between 0&1), you will need to be able to copy the state, which is prohibited by the No Cloning Theorem.
So, to answer your question - you *may* be able to achieve instantaneous transmission of information, but you can never observe that information in a causal fashion less than the speed of light. Did that make sense?
They get it working already. Only problem is when you are teleported you get a goatee and become evil.
Very good article, but some people might find Einstein-Podolsky-Rosen paradox article on Wikipedia somewhat better for an introductory text, and at the same time richer in details:
The EPR paradox arises in a thought experiment which shows that quantum mechanics leads to very counter-intuitive and paradoxical consequences. It is named after Einstein, Podolsky, and Rosen, who published the idea in 1935. It is also referred to as the EPRB paradox after Bohm, who converted the idea into something that was nearer to being experimentally testable. The EPR paradox draws attention to a phenomenon predicted by quantum mechanics known as quantum entanglement, in which measurements on spatially separated quantum systems can instantaneously influence one another. As a result, quantum mechanics violates a principle formulated by Einstein, known as the principle of locality or local realism, which states that changes performed on one physical system should have no immediate effect on another spatially separated system. The principle of locality is persuasive, both in intuitive grounds and because it seems at first sight to be a natural outgrowth of the theory of special relativity. According to relativity, information can never be transmitted faster than the speed of light, or causality would be violated. Any theory which violates causality would be deeply unsatisfying, and probably internally inconsistent. However, a detailed analysis of the EPR scenario shows that quantum mechanics violates locality without violating causality, because no information can be transmitted using quantum entanglement. Nevertheless, the principle of locality appeals powerfully to physical intuition, and Einstein, Podolsky and Rosen were unwilling to abandon it. They suggested that quantum mechanics is not a complete theory, just an (admittedly successful) statistical approximation to some yet-undiscovered description of nature. Several such descriptions of quantum mechanics, known as "local hidden variable theories" were proposed. These deterministically assign definite values to all the physical quantities at all times, and explicitly preserve the principle of locality. Of the several objections to the prevailing interpretation of the quantum mechanics spearheaded by Einstein, the EPR paradox was the subtlest. It is at present considered to have been unsuccessful, the existence of hidden variables having been refuted experimentally and the EPR "paradox" taken to be fully resolved within the current interpretation of the theory. The belief that entanglement is a real phenomenon has led to a radical shift in thinking about 'what is reality' and what is a 'state of a physical system'. First, a review of the history: Before 1936, the generally accepted view was that a particle, such as an electron, has measurable properties such as a position and a momentum but 'we cannot know both' at the same time. This view is present in some explanations of the Heisenberg uncertainty principle. In such an explanation, the 'more exactly we measure the position', the 'more we disturb the particle' and its momentum becomes that much less certain. The numerical measure of uncertainty satisfies Heisenberg's principle, but this (local realistic) interpretation is rejected in professional circles, though it still lives in popular books. The shift was caused by the EPR thought experiment, which has shown how to measure the property of a particle, such as a position, without disturbing it. In to
Sincerely,
Pan Tarhei Hosé, PhD.
"Homo sum et cogito ergo odi profanum vulgus et libido."
This is how i read it too - but one thing doesn't make sense to me.
If the particles are entangled, and it observe one of the observer ones, isn't that going to change all of them because they are still entangled?
or do you unentangle them before you observe them? Can you unentangle particles without changing their state?
The probability "amplitude" that represents a solution to say, Satisfiability, would, on average, be 2^-N. To distinguish a possible solution probabilistically from 0, 2^N trials would be needed. Or so says "A New Kind of Science" by Wolfram.
That's right. All your base.
No, that's the whole point of quantume entanglement.
Entangled particles are created in a process that conserves quantume properties, like spin. So if a particle is in the spin up state, the other has to be in the spin down state. When they are created, entangled couples are in a undetermined state. As soon as a measurement is made on one of the particles, the other collapse to the complementary state. This happens instantaneously, regardelss of the distance between the particles. However, since you cannot predict the result of the measurements, you cannot transfer information with this method. You can however use it to create secure keys fro criptography.
Disclaimer: IANAQP
I'd like to axe what I believe is a common misconception about quantum computers:
"The reason Quantum computers are more powerfull than classical computer is NOT because they perform operations on 2 to the n different data points at the same time."
They can't do this because in the end the superposition of states must collapse to a single state when measured. This collapse occurs randomly, meaning that its almost as though each of the n original q-bits were randomly chosen to be either 0 or 1. While this would allow for true random algorithms, it would be of no practical use in terms of computing efficiency.
From what I've been able to learn, the key to quantum computing is INTERFERENCE not SUPERPOSITION. It is true that quantum computers use superposition in order to create interference, however laymens like me reallly get the wrong impression when focus is put on the superpostion of states part which seem to imply that quantum computers are much more powerfull than they really are.
Hence, it seems that interference allows for making operations in constant time that are impossible to do with a classical computer. Think of it as being able to use the interference gate on top of the traditional AND and OR gates. Diagram B in parent's linked article shows how this interference might work. The actual workings of this "interference gate" and how we can actually use it to improve performance is highly non-trivial.
In fact its probably so complex that the real PQs can't put it into laymens terms. So they just give up and say: "look with 500 q-bits we have a superposition of 2^500 states. And thats a REALLY, REALLY big number! So obviously quantum computers are faster!"
Anyway, that's my best estimate of what's really going on given my current understanding of things.
The laymen's version of this post: "no, you can't download all porn movies at the same time by using 10 billion q-bits 'cause that'd be just too good to be true and would unravel the fabric of the universe"
What about the the information that someone stopped the other clock?
Sure, but the question is still how this works.
The grandparent apparently assumes that consciousness breaks down and a new begins when you sleep. That's one possibility.
Another is like you you suggested that your consciousness is continues from birth till death.
And a third is that consciousness is instantanious - that "You" really didn't exists a moment ago and won't exist in a moment - that "You" only exist in a instant only to be replaced - and the feeling of continuity is just a trick played by your mind.
So which is it? Well, for teleportation to work it would obviously have to be the instantanious (or sleep) option - as you wouldn't lose too much anyway. And I favor the instantanious model because it limits (excludes) the part a soul would play in a human body.
However, I sure won't set my foot in a teleporter untill someone has come up with a very credible explanation of why my consciousness shouldn't care.
Comment removed based on user account deletion
"So, to answer your question - you *may* be able to achieve instantaneous transmission of information, but you can never observe that information in a causal fashion less than the speed of light. Did that make sense? :)"
What if that information is a person? What happens then? Does the person get instantaneously transmitted to the other side or not? e.g. you transport the blackbox, even though you never look inside, the blackbox still gets to the other side.
Or is it impossible to set the state of the original particles reliably before the transfer?
Then it is FTL if the transmission is instantaneous. I mean FTL in that because it's instant from point A to point B in teleportation (so I'm assuming), then such a method would be far faster then say....using radio waves or a beam of light.
Imagine being able to control Spirit on Mars in "real-time" or a network that spans all of space. But the question is how does the recipient know when to expect such a transmission? I can only think of using a synchronous fax like system involving atomic clocks at both ends to keep the system in sync.
Life is not for the lazy.
I haven't seen this mentioned in the threads yet so...
Quantum computing will NOT necessarily speed up all your porn browsing, DOOM playing arses. Instead, Quantum computing affects a set of computational problems that fall into the category of "Non-Determinstic time" algorithms. Non-Determinstic algorithms are identifiable by the fact that they all benefit hugely from being run in parallel. Basically a good rule of thumb is that quantum computing will affect algorithms that gain from being run on massive numbers of processors simultaneously given different (but not inter-communicating) inputs.
Some such problems are:
--Most if not all current cryptography
--SETI
--Other problems where you're looking for one specific output given a potentially huge number of inputs.
As an example in cryptography, a sufficiently powerful quantum computer would be able to break your RSA, DSA, DES3 or any other symmetric or non-symmetric cypher instantaneously if the author of the quantum program knew what they were looking for.
I'm suprised no one has mentioned it so far in the threads...
Karma: The only way to win is not to play.
Because we all know what happens when you open the teleporter.
Long times in the dark with guns without flashlights, thats what.
Most people aren't thought about after they're gone. "I wonder where Rob got the plutonium" is better than most get.
Werner Heisenberg was pulled over...
Get your Unix fortune now!
Since you don't know the state of the first one then knowing the second state won't help you. But you do know if, I think, if the first or second has been measured. So to communicate a "1" you just measure the first, collapsing the second. The guy far away where the second then "sees" the second collapse and knows it to be at the same time as the first. If you want to do binary then have 2 sets. The left for 1 and the right for 0. Whichever collapses first means the bit is that value. Of course I know nothing of this but it sounds correct. Can you explain the problem?
Why don't you guys have friends or journals?
Given the patent fiasco of the internet (just add "e" to anything and receive a free patent), now is the time to create prior art for quantum computing and publish all the ideas for adding "q" to everything. Only by striking first and getting innovation in the public domain can we have true open and unencumbered standards.
There are already lots of patents on quantum computing:
5,530,263
5,768,297
6,128,764
6,218,832
and many, many more.
OS Reviews: Free and Open Source Software
1.)
Austria != Australia
In Austria there are NO kangaroos, but the Alps, Mozart, Beethoven, Sissy, Schwarzenegger and the river danube in the middle of europe!
2.)
It should not be "Hans J. Briegal of the Australian Academy of Sciences"
but
"Hans J. Briegel of the Austrian Academy of Sciences"
Read more at the University of Innsbruck/Austria page:
http://homepage.uibk.ac.at/homepage/c705/c705114/
...B: is it too late to get people to stop calling this "teleportation"? No material object winked out of existence here and recreated itself over there.
Otherwise wake me when they get as far as transfer booths.
Must go -- gotta teleport some files to the server.