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Scientists Race To Establish the First Links of a 'Quantum Internet'
ananyo writes "Two teams of researchers — once rivals, now collaborators — are racing to use the powers of subatomic physics to create a super-secure global communication network. The teams — one led by Jian-Wei Pan at the University of Science and Technology of China, the other by his former PhD supervisor Anton Zeilinger of the University of Vienna — have spent the last 7 years beating each other's distance records for long-distance quantum-teleportation. They now plan to create the first intercontinental quantum-secured network, connecting Asia to Europe by satellite."
Couldn't quantum teleportation (paralell with some form of classical communication like the internet) be used as an uneavesdroppable communication channel?
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The word "US" is nowhere in sight.. Asia and Europe.. Why am I not surprised?
Because we have always been at war with Eurasia.
You are upset the US merely invents half the shit invented each year, and the rest of the world the other half, and this falls in the other half?
(-1: Post disagrees with my already-settled worldview) is not a valid mod option.
Because Quantum Entanglement is not in the bible.
Obama's legacy: (N)othing (S)ecure (A)nywhere and (T)error (S)imulation (A)dministration
Does evesdropping on a quantum message destroy the message? People talk about super secure quantum messages because it leaves a detectable trace, but does it also destroy the message in the process?
Some people die at 25 and aren't buried until 75. -Benjamin Franklin
Now the rest of the world can proceed to steal their technology and not pay them for it.
You and a friend put one black and one white marble in a tin and shake. Without looking you each grab a marble and put it in your pocket. You travel some distance apart and then check your pocket. If your marble is white you now instantly know your friends marble is black. That's basically the level of communication in quantum entanglement.
Yay! QE is a major component of my scifi book's communications. Yes, it's a crappy book, but it is my crappy book... and you can read it online without DRM, blah blah blah.
http://cruft-private-janitorial.com/?chapter=1
Can't wait for animated breakfast bar wrappers! Or Capt. Skyking brand Starling!
meh
Probably because quantum entanglement can't actually transmit information
You should re-read that. Quantum entanglement cannot be used for faster than light communication, but that doesn't mean there are not applications in transmitting information slower than speed of light. There definitely are some potential applications in that case, and it is more of a matter if it can be done practically.
I promise you they will have it working in a week.
Someone else looking at the marbles breaks the entanglement in the quantum case, and you can't copy it before looking. If you tell your friend you got the white marble, and they see a white marble too, they know someone has been at their marbles. Then they know the key is not safe to use. The actual exchange is a little more complicated so you can't work out the key from the classical communication, only the researchers can tell if it has been seen or not. Classically, if you wanted to stop someone from seeing your marbles, I would recommend pants.
Pardon my ignorance, but are you implying that "patents half the shit patented each year" and "invents half the shit invented each year" are the same thing?
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I can start making Schrodinger's Lolcats. Until you open the link, you don't know if its funny or not.
I still have more fans than freaks. WTF is wrong with you people?
There is zero need, zero benefit and zero possibility of actually creating more than small demonstration.
Most ACs are not even worth the keystrokes to insult them. Be generically insulted by this and ignored otherwise.
However, this experiment is no different to having a black or white marble in your pocket and then looking at it to find out which you have. Knowing which your friend has does not supply any extra information, as to tell this person you are still limited by the speed of light. If you're a light year apart and you know what your friend has the information will still take a year to reach them, and the no-information-travels-faster-than-c rule is preserved.
Please consider this account deleted, I just can't be bothered with the spam anymore.
"Quantum Entanglement" will be a new ability for infestors in Heart of the Swarm. Now Zerg can be imba at faster than the speed of light.
Did you send this from the future?
Because Quantum Entanglement is not in the bible.
"...and god said, 'Let there be photons. And there were photons.'"
Quantum physics is pretty far over my head - and yours too.
Your friend doesn't need you to tell him which color marble he has. He has the other half of the quantum linked marble pair! What you know, he knows, and vicey-versey.
Now, the real question is, how do we use those marbles to communicate in real time? Can we make them dance and vibrate synchronously? One marble. Or, more accurately, one marble here, one marble there. Maybe we can cause them to switch from black to white and back again, in some manner? There we have it - binary!
Now, there's just the pesky little problem of getting the marbles to cooperate, right?
"Windows is like the faint smell of piss in a subway: it's there, and there's nothing you can do about it." - Charlie Br
Now we can be at war with Eastasia and allied to Eastasia at the same time!
Don't know the capacity of present day photon traps, but if they could squeeze in say a couple of petabytes of those quantum entangled photons simultaneously into two photon traps at location A, then FedEx one photon trap to location B, then as I understand it, you would enjoy 1 GBit/s instantaneous IPv4/IPv6 between location A and B (regardless of distance) for say one year. I.E. digging that new Atlantic cable might not be the only option for achieving even higher speed stock trading...
Quantum Entanglement is useful almost exactly in the opposite way than you're suggesting.
You simply cannot transfer any information faster than light. Period. Nothing about QE makes that possible. It sounds like it can, when you don't fully explain it, but it really doesn't. There's no amount of entangled particles you could add, there is no protocol you could use that will make it work faster than light.
The only even semi-theoretical way of effectively going faster than light that I'm aware of is warping space-time itself. QE does not do that.
QE, however, is much more likely to make things secure, although I seem to recall reading something that suggests that even that is not as secure as we'd like.
how do we use those marbles to communicate in real time?...Now, there's just the pesky little problem of getting the marbles to cooperate, right?
Therein lies the rub. It would be great if we find a way to do that, but it wouldn't be with quantum entanglement unless something is fundamentally incorrect about quantum mechanics.
How susceptible to DoS attack is this set up anyways ? Real talk.
If you tell your friend you got the white marble, and they see a white marble too, they know someone has been at their marbles.
So if your encryption key is compromised, you lose your marbles?
You are not a brain: http://books.google.com/books?id=2oV61CeDx-YC
I always thought that using a one time pad could use something like a simplified key. Take a irrational number like Pi, and then use an offset and size (length) for the pad instead of the whole key.
The critical part of a one-time pad is that each bit of the key is truly random: there is one bit of entropy for each bit in the key. Anything less amounts to reusing bits from the key, so it's no longer "one-time". What you've described is essentially a form of pseudo-random number generator, with the offset into Pi as the seed. A PRNG can form the core of a symmetric encryption algorithm—just XOR the pseudo-random bit-stream with the message—but it isn't a one-time pad because the entropy of the PRNG output is limited by the entropy of the seed.
For example, the offset in your example would only require a brute-force search through an approximately 56-bit key space (the first 2^56 digits of Pi). If the message is much longer than 56 bits, and not random, then a brute-force search is likely to be able to distinguish the correctly decrypted plaintext from random noise. If there are patterns in the PRNG output it may be possible to take shortcuts and reduce the search time. A true one-time pad has a key for every possible combination of plaintext and ciphertext, so a brute-force search cannot tell you which key was used, or which message was actually sent, and there are no patterns for cryptoanalysis to take advantage of.
"The state is that great fiction by which everyone tries to live at the expense of everyone else." - Bastiat
The Tortoise and the Hare.... So which side of entanglement will get there first?
Not at all - when you look at your marble you find out what colour you have, and can deduce the colour your friend has, but your friend receives absolutely no information from this, you have to send the message by traditional lightspeed means if you want him to know. He could, of course, just look at his and then you would both know what colour you have, but this isn't a "carrier wave" you can transmit information with.
Please consider this account deleted, I just can't be bothered with the spam anymore.
Because Quantum Entanglement is not in the bible.
"...and god said, 'Let there be photons. And there were photons.'"
“In the beginning, there was nothing. Then God said, 'Let there be light'... and there was still nothing but, you could see it." :: Groucho Marx
Signatures are a waste of bandwi (buffering...)
So...they're hoping to make a 'Quantum Leap' http://instantrimshot.com/
Insert_Ending_Here
I think every particle could represent a bit and you could have about 8 at a time and you would get a byte of data sent. Then just time it like clockworks to sent a long string of data. It is instantaneous not just secure.
That's right, and none of those dumb old scientists ever thought of this until you posted here. By Christ they must be kicking themselves now for overlooking something so beautifully simple!
To have a right to do a thing is not at all the same as to be right in doing it
You raise a good point. QKD ensures that you share the key with exactly one peer; it doesn't say anything about who that peer is. If, rather than simply eavesdropping, someone managed to redirect the channel to their own equipment, you could end up sharing the key with the attacker rather than the intended recipient.
For this reason, all QKD protocols require an authentic (but public) classical communication channel in addition to the eavesdropping-evident quantum channel. Once the peer has been authenticated, QKD can be used to arrange a shared authentication key for the next exchange. The first exchange, however, must be authenticated through more traditional means.
"The state is that great fiction by which everyone tries to live at the expense of everyone else." - Bastiat