Slashdot Mirror
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.
Imagine a bewolf cluster of quantum computers!!!
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
now they just have to make sure there are no quantum flies in the teleporter. I heard that doen't turn out too well.
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.
"They teleported the unknown quantum state of a single photon onto a superposition of three photons"
Oh Please!... I did that twice this morning. And they were both floaters.
aieeeeeee!
So uh...... does this mean faster than light communication? or am I missing something.
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.
...did someone let a fly in there?
Everyone will start to cheer when you put on your sailin' shoes.
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?
You still get way too many wide-eyed futurists with this stuff. Wasn't voice supposed to be on the internet a decade ago? Dazzled by the elegance here again?
Quantum computing may work for specific, useful applications.
-I am an elective eunuch.
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.
Quantum teleportation is akin to faxing a document and in the process destroying the original. Teleportation is a potential method of transferring information within quantum computers, and can also eventually be used to transport information among quantum networks.
I can't wait to see the quantum computers many have been talking about for so long now! It's going to be a fascinating time once they get quantum. (and not just the "speed of the computers", they're ought to discover alot of neato things/new concepts/... once they actually can manipulate photons like that!The mere idea of being able to actually be "teleporting"...
I think we can keep recursing like this until someone returns 1
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.
Hehe, that was some funny shit.
While I have to admit that I have only a fairly rudamentry understanding of the theory behind all this, it's great to see that progress is bringing us all the closer to realizing a quantom computer.
As I understand it, what this is saying is that they have not discovered a way to have error correction in a quantom network. AFAIK this quantom network is not referring to a network of computers as we would think of it today, but is basically saying that in a network of entangled particles, or a network of qbits, we now have a way to verify the integrity of the data we read.
When they say teleport, I'm quite sure they are not talking about Faster than light speed communication or anything, but rather that they have a way to use the enganglment to transmit the data of the quantom states.
Taking a huge leap given my limited understanding of the subject, it seems like what they have done is basically entangled the particles so that there is a parity qbit in order to varify that nothing was fouled up.
Famous Last Words: "hmm...wikipedia says it's edible"
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
When you "teleport" information between two quantum bits, at what speed does this information move between them?
Some interesting synchronization/race condition issues just waiting to be found, one suspects, when there are parts of your computer not bounded by speed of light considerations, and parts that are, as well as deterministic parts and quantum parts.
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)
Insert obligatory Duke Nukem Forever joke here.
Never, ever lose a file again. Ever.
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.
I thought the teleportor/gate/hell in doom3/half-life was not real... Maybe they should rename their lab to Delta Lab.
And you call yourselves nerds!
They look like these .
. . . .
Or
.
.
.
.
.
Hey, it was not that hard to do.
So, lets say you have two pairs of entagled photons. Half you give to one side and half to the other. If you want to send a '0' bit, you read each photong normally, and when the other side checks, they can see each of thier photons have a different reading.
Now if they want to send a '1' then they entanlge the two photons that they have on thier own end, making all four of them be entangled, and then read just one of them. Now all four of them would be in the same quantum state, no?
"Your superior intellect is no match for our puny weapons!"
The physicists also demonstrated what they call 'open-destination teleportation,' a way to teleport quantum information within and between computers.
Bluetooth is sooo 21st century!
Will there be quantum hot spots?
Thanks to quantum computation and teleportation, this is actually the first post.
rewriting history since 2109
http://shit.slashdot.org/article.pl?sid=04/08/30/0 132204&threshold=-1&tid=93&tid=134&tid=126&tid =1
Much easier on the eyes.
do these scientists know they are infringing on a patent?
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.
we missed the Eugenics wars in 1992-1996.
The role of the writer is not to say what we can all say, but what we are unable to say. -Anais Nin
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?
Just so people recognize which of the comments are
:)>
jokes or off the wall, here are a few facts.
1. Quantum teleportation can't be used for
faster-than-light communication unless it is
coupled with slower than light communication.
2. Entangling 5 cubits is in fact a major advance
in quantum computing.
3. While the Schor factoring algorithm is the best
known quantum algorithm, there are several others
that have considerable promise for such things as
searching databases and determining equivalence of
graphs.
4. Forget about Beowulf networks of these things.
If we can get 32 bits entangled, a single
machine would probably pack more wallop than all
the Beowulfs currently existing.
5. You definitely do not want to be beamed up or
down by quantum teleportation: Since quantum
teleported states can collapse probabilistically
into different final states, you might wind up
with your head inside your ______ (fill in the
blank as you see fit
What High School physics course did YOU take that taught you what a qubit is?
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
That would be (cough, cough): "amongst we grammar nazis", not "among us grammar nazis".
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."
OK enough trekkies speaking about Scotty and telling horribly stupid jokes.
The article is about Quantum Computing. Qubits behave differently than bits regarding that they're both in 1 and 0 at the same time, and with entanglement, we can know the state of a qubit by analizing the other one. Even when they're not in the same physical space. But they're ENTANGLED - that means they share some properties.
When this is applied to computing, and we get the first quantum computers to work, it will mean that we'll be able to perform computing faster than we've ever imagine, because of the implicit parallel processing in qubits.
This means we could break traditional cryptography in just a matter of seconds. (And this means we'll have to use quantum computers to devise a new kind of cryptography: Quantum cryptography).
Here's an introductory article to quantum computing for those who really want to know.
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.
STFU?
>http://www.magiqtech.com/ >STFU? Where are the detailed hardware schematics on all of this? You want to keep this "secret"? GET A LIFE!!!
They get it working already. Only problem is when you are teleported you get a goatee and become evil.
If you follow the link, you will discover that the poster made an exact copy of the first few paragraphs of the linked article. Come on, mods. People deserve mod points for their their own ideas, their own words, and even quoting someone else when it's a pertinent quote.
Nobody deserves reward for taking another person's intellectual product and presenting it as their own.
So would this discovery let people solve any element of the set of NP-complete problems in linear time?
Yeah, I'm sure when I go buy my next harddrive I'm going to get the schematics, physical blueprints, and firmware source with it. Yeah...
It's not like this is new science. The technology has been repeated in multiple labratories throughout the world. It's now available as a comercial product.
Wake up... it's a new day.
Right about now shouldn't somebody be getting worried about resonance cascades and portals to hell.
It's 10 PM. Do you know if you're un-American?
Now I get the chance to upload those pesky users into my computer network - then they'll have to live in the mess they have created.
Wait - that sounds like the current state of the world
Oh - oh - maybe God is the last Systems Administrator afterall (hope he doesn't bump the reset button)
we were back in the early 1900s when the mechanical relay was invented, and this guy was standing around scoffing at the invention because we couldn't yet add two plus two, despite the fact it was clear the mechanical relay was clearly going to be absolutely integral in making adding two plus two possible.
Blah Blah Blah Blah,Blah,Blah, of their works.
...in the usiverse and we're sorted!
Engineering is the art of compromise.
Can an improbability drive be built using this technique?
Can somebody please answer a little question for me? IANAP, although physics phascinates me.
Now, I know about Heisenburg's principle, where you can't observe particles without (possibly) altering them. But what about entanglement? Can you entagle particles, and then be able to measure one of the entagled particles, only to disrupt that one and not the first one?
Punctanym: alternate spelling of words using punctuation or numerals in place of some or all of its letters; see 'leet'
> Yeah, I'm sure when I go buy my next harddrive
> I'm going to get the schematics, physical
> blueprints, and firmware source with it. Yeah...
> It's not like this is new science. The
> technology has been repeated in multiple
> labratories throughout the world. It's now
> available as a comercial product.
Documentation on "quantum" software is ad nauseum, docmentation on hardware is a joke.
What good is open source with closed (probably unshielded) hardware?
>Wake up... it's a new day.
I think it is the same old day, the one where the same old Reich is directing the brand new Euro-brain to lead us directly to holocaust.
Sam.
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."
Permission is granted to copy, distribute and/or modify the above text under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License."
Sincerely,
Pan Tarhei Hosé, PhD.
"Homo sum et cogito ergo odi profanum vulgus et libido."
That is funny as hell.
My original post was merely a bet with myself that I could post almost any random semi-coherent thing and get at least 5 replies.
I Won!
This issue is a bit more complicated than you think.
...blah blah blah blah blah blah; you have the helm, Number One. (-:
Here was me thinking that qubit was the little round dude that hopped around on all of those coloured cubes.
Got time? Spend some of it coding or testing
KDE == Koroba, Papua New Guinea
GNU == Goodnews Bay, USA
GPL == Guapiles, Costa Rica
CPM == Compton, USA
Big irony? TLA is unclaimed! (-:
Got time? Spend some of it coding or testing
...licence it as Creative Commons. The courts will have to issue jaw slings to stop the judges' brains from running out of their mouths and ears. (-:
Got time? Spend some of it coding or testing
Mod Parent up, +3 insightful.
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?
Finally something that might make networks managable and fast. Fluctuations of latency due to distance will remove limitations on maximum transmission units.
These news are the best that I read in a while.
You can't copy the data as you send it, but you can impose a copy of existing data onto the qubits you're sending? Where "sending" is an approximation what's actually happening, ie, the state is being transferred, not the particles. More or less.
In short, you can copy the data and move that copy to the other end, destroying the copy in the process.
<pluff> <-- sound of brain exploding.
Got time? Spend some of it coding or testing
nt
I read some of "Schrodinger's Cat" so have a very rudementary knowledge of the whole observe the experiment and the result changes therory. But this is the application. So maybe some of you guys out there can clear this up. If you do this whole thing and say take a microscopic pic of the new qbit, then it changes when u take the pic? How in donky raping hell can that really happen? How does it know it is bieng observed? Yes I know it sounds like I'm a dumb ass w\ how I put the question but in the simpelest terms thats what it sounds like. How am I wrong here? (I know I am.)
(Use the Preview Button! Check those URLs!)
Hmm. Given that training simulation, I think I'm going to go stock up on duct tape now.
If the two are entangled and measuring first changes it's state. Would measuring the second change the state of the first because of the entanglement?
Thank God! I was fevering over this one for at LEAST 10 minutes yesterday!
Thank you quantum leaper!
BA BHA A
strike again.
This is all bunk; it should be scored at zero.
holy crap.. i go around feeling inteligent most of the time.. and this comes as a slap in the face saying "hey you better see if the school has classes on quantum computer or your going to be left in the dust in 10 years"
When you sleep you are not duplicated then destroyed.
;).
If i were to make a duplication of you and then asked you "Who do you want to die *you* or your *double*, I'd guess you'd like to be the one maintain consciousness
Comment removed based on user account deletion
Comment removed based on user account deletion
Ie. if enough budget was provided, a quantum computer could be build ?
Slashdot: stuff for news, nerds that matter, matter for news, stuff that nerd
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!
(Well, except for that one episode...)
You must think in Russian.
The parent is exactly correct. I can't tell you how many times I've had to explain the distinction between phase and group velocities to people who've never heard of such things. Alas, you sell more newspapers when you print a headline like "Speed of Light Broken". Of course, the fact that the speed of light was not actually broken does not bother anyone.
IANA Quantum Physicist, but...
I gather that time travel is basically impossible, at least for any meaningful kind of matter as it involves going faster than the speed of light.. but what about on a quantum scale?
Would it be possible to use any of these funky quantum effects (as is, I beleve, the correct and technical term) to send data back in time? I mean, say you can alter the spin-state of something in the past.. well, that's a bit, which gives you a byte, whcih means you could use that to effectively uh.. email yourself next week's lottery results.
Curiosity was framed. Ignorance killed the cat.
You can perform any quantum operation by superimposing a phase-inverted antimatter flux onto a set of photons in a submicron warp bubble.
everybody knows it's not as simple as pressing a button: you have to change two or three keys, then press a button, then get the three linear potenciomenters slowly up and down again.
It's better to be the foot on the boot than the face on the pavement. ~~ tkx Kadin2048
It's good to notice that Trek teleportation technique involves diassembling and reassembling (with the atoms of the transported body physically transported between point-of-origin and destination), and not destroying and reconstructing (ok, it *is* destroying and reconstructing in a certain way.)
My point is that the information that couldn't be "analyzed", or "read" from the original body is transported with its original atoms, and the rest of the information is digitalized and used to re-assemble the thing.
Anyway, I'm nitpicking, ain't I? But it *is* the most-ubiquitous form of sci-fi teleportation...
It's better to be the foot on the boot than the face on the pavement. ~~ tkx Kadin2048
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
According to my experience (I'm a Chinese college student), China has no real research universities and China's research institutes rarely made any big achievement. So either my experience is out of date or this news has something unveiled...
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.
Symmetric ciphers are not generally broken by quantum computers. An attack based on Grover's algorithm would halve the key size, but a 256-bit key would still be as hard to break as a 128-bit key on classical computers.
OS Reviews: Free and Open Source Software
This is not quite right.
QP, the class of problems solvable by a quantum computer in polynomial time is known to contain P (polynomial time on a Turing machine) and be contained in NP (non-deterministic polynomial time). Now, we don't know that P =/= NP, but assuming that it isn't, then, I think we know that QP NP, so there are NP problems NOT solvable in polynomial time on quantum computers. We don't know, even if P NP, that P QP, although there are problems currently known to be in QP, and not in P, such as integer factorisation (which is why RSA falls to quantum computing).
Assuming QP NP that tells you that no NP-Complete problem can be in QP, so the way to protect against quantum computer-equipped eavesdroppers is to find a crytpo-system such that you need to solve an NP-Complete problem to break it.
Say you have a quantum state, you cannot read all the information it stores, lousy example:
its like having a 3d object but beeing only able to project it only on ONE plane.
There is this city but you can look at a city map but not find out about the height of the buildings, OR you can look at a transverse view, the skyline, where the tallest building covers all the others behind. In both cases you loose some information and you will never be able to fullyreproduce the city.
A quantum state can be fully copied (only destroying the original in the process) to another quantum system using some other (entangled) particle as a transport medium (plus you will need to transfer at least two common bits).
The (entangled) particle must travel at a speed above or equal (if you use a photon) the speed of light, so NO, this is NOT faster than light information transfer.
Also the old style bits have to travel thru a ol' style bus, again slower or as fast as light, so, again, no faster than light transfer.
Disclaimer: I study quantum physics, it does not mean I have fully grasped it. (IMNYQP: i am not yet a quantum physicist!!!)
AFAIK "Teleporting" is mainly a buzzword.
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/
Too much Doom 3 this weekend as this is my first Monday thoug on the topic
Kindly either provide a source or be quiet?
So, how long till they relocate to a Mars base?
Mental note - dont join the space marines...
Does this mean we're getting closer to the ansible? Or am I reading this wrong?
*The ansible is a device invented by William Scott Card that allows you to communicate faster than the speed of light, since photons linked to each other react instantaneously as their linked counterpart is manipulated, no matter the distance between them (or so we think).
Personally my laymens concept of string theory makes me believe taking the photons great distances apart from each other will stretch their connecting 'string' to a limit, causing unknown results.
Maybe we'll blow ourselves up!
Wes Clark
http://prettybored.com
Ace
...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.
This will be great, the RIAA/MPAA won't be able to track our downloads and thus their whole business model of suing poor individuals who happened to download a few songs will collapse!
Why can't you start off with 8 of these uncollapsed, then just collapse whatever ones you want to be "on", leaving the others uncollapsed of "off"...
I find this hard to believe. I know nothing about the field, and I'll bet that whatever those researchers estimate will take 2-3 times longer. Practical quantum computers in a hundred 60-100 years. :)
They said the speed of sound will never be broken and they where wrong.
As I read the post I see a lot of people saying you will never be able to tranfer data faster than the speed of light. They must be using Windows and are waiting for Longhorn.
Nobody should ever say never. People should realize that everything is possible.
Once Prime Intellect gets a hold of this I want to be invited to all the good parties.
"Don't waste your time or time will waste you" -MUSE
Ah... Quantum Computing. Another hole to throw money into like cold fusion. Computing with bits you can't measure as a 1 or a 0 without destroying information is going to be very difficult at best if not impossible. Entanglement doesn't make things a whole lot easier. While I've seen theories on how to do calculations in qubits, there's not much on how to create inputs and outputs for the system. I really wish they'd keep their "breakthroughs" under their hats 'til they have at least theories on how to create a complete computer for quantum computing. It's as if they're building a space ship on the ground w/ a big hole in the center for the warp drive engine they're hoping someone will invent and an antigravity system to get the ship off of the ground. Optical computing at least has some promise in the near future. Don't get me wrong, i'm all for the advancement of science in all areas, but this "breakthrough" is more deserving of a small paragraph on a page in a science journal, not slashdot or general news media. This isn't the kind of discovery that'll have any practical application quite possibly even within the next century... It's not "News for Nerds" it's a possible footnote in future history. Wow... they've found a way to do error checking in a computer they can't figure out how to build yet. woohoo. Why, we could use this to... no wait... not that. I know, I could buy the equipment and use it w/ my buddy to transmit quatum encrypted information! no... can't do that either, and way too expensive even if I could. Why... this will help us cure cancer! no... It must be a slow news day.
Imagine a beowulf cluster of quantum computers!
Imagine a beowulf cluster of photons!
Which is precisely why I stated " if the author if the quantum program knew what they were looking for". What makes RSA easily crackable using quantum computing is the fact that the solution is trivially verifiable. AKA, there's only one right answer. The "answer space" for DES3 or any other symmetric alogrithm is such that unless you know what you're looking for you won't be able to find it. If you don't know what's in the encrypted packet AT ALL, then yes, you're right. However, if an attacker realized that certain headers or other recurring information was present (as exists in most such real implementations to date), they would be able to utilize this information to much more quickly narrow down their search for the actual key used in the transformation. If you read Grover's Algorithm carfully, you'll note this difference. Quantum computing is all about knowing how to verify the solutions coming out of the black box.
Karma: The only way to win is not to play.
You're notation is very confusing, and I can't follow it.
Karma: The only way to win is not to play.
This is the stuff from Star Trek that ended up on the cutting room floor.
> Imagine a beowulf cluster of quantum computers!
But wouldn't a single Quantum computer be about as efficient as a cluster of them? If you can compute anything instantly, what's the difference between that & 5 computers figuring the same thing out? Does it become a fifth of an instant?
If I understand correctly, you're right in so far as a public domain work can be modified, and the result copyrighted (or copylefted, if the courts eventually agree.) However the converse is not true. It's a one-way street.
The GPL is emphatically NOT public domain. The author retains ownership of the original work. The GPL is a way of licensing copyrighted works. Its purpose is to allow freedom without losing control of that freedom, ergo the much discussed "viral" aspect: derivative works must be released under the same license. A derivative of a GPL'd work can not be released to the public domain.
Public domain has no restrictions whatsoever. You've literally given up ownership. Derivative works can be released under any license, or no license, with or without attribution. BSD license is closer to public domain, as it (IIRC) allows any type of reuse so long as attribution is included.
Of course, IANAL, etc.
It's easier to be a result of the past, but more fun to be a cause of the future! http://www.spacefinancegroup.com/
Replying to self, the original subject lost the little > symbols. Trying again...
It's easier to be a result of the past, but more fun to be a cause of the future! http://www.spacefinancegroup.com/
Grover's algorithm requires O(2^(n/2)) oracle calls and therefore does not run in polynomial time. So all you need is to double your keysize and you should be safe.
OS Reviews: Free and Open Source Software
Since this is gonna be used inside computers to transfer information around, and across networks, why wouldn't be used in long distance communication? especially interplanetary...it would be very interesting.
You'll need to be a bit more specific. I'm using =/= for "not equal to" and for "is strictly contained in" does that help?
Sun invented something new?
yeah, bitch.
It is a problem indeed, but isn't that a problem of describing nonlocal behaviour in general, not this article in particular? How would you suggest solving this problem without introducing hidden variable theory?
Sincerely,
Pan Tarhei Hosé, PhD.
"Homo sum et cogito ergo odi profanum vulgus et libido."
This one, for instance.
Cool, I like computing at greater than 'c'. And then QCD 'pooters' will have more than two logical states. Should make for some interesting gates......and not the 'Bill G$$$$$$$" kind.
i see ... i see ... yes! the quantum radio! ... and ... ... (catches breath)
...
photons (lasers) and light detectors (CCDs,
solarcells) and emitter and mirrors and
and
woah, i hope i'm gona get a nice quantum play kit
from LEGO!
lemmeatit!
p.s. it is strange, this teleportation thing. i'd
prolly build a nice teleporter at the bottom of
a hydro plant and teleport the water back up
Sorry, the original has now been destroyed, but somehow its first few paragraphs have ended up on /.
[for those who don't get the joke, it's impossible to non-destructively intercept the connection, but that won't stop them from passing the law]
J
Although Helsinki, Finland has a better code for them.
Got time? Spend some of it coding or testing