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First 'Quantum Computer Chips' Demonstrated
holy_calamity writes "The first quantum computer chips have been made by two US groups, New Scientist reports. Both NIST and Yale have demonstrated chips where information was transferred between two superconducting qubits using a 'quantum bus'. The bus is made from a cavity that traps a single microwave photon as a standing wave — the NIST group also managed to use the bus to store data from one qubit for a short time. 'After encoding information in one qubit, they transferred it into the cavity for 10 nanoseconds before transferring it to the other qubit. Yale's chip used qubits around 1-micron square built on silicon, while NIST used larger 10-square-micron qubits on top of sapphire. In both prototypes, the bus between the qubits was between five and seven millimeters long.'"
maybe I'm first, maybe I'm not.
Is it just me, or do you hate it when people say "Is it just me..."?
Must...Not...Imagine....Beowulf...Cluster....
Gifts for Geeks - Stuff that really matters!
Howdy. I don't claim to understand all of this. However, the more I read, the more I am convinced the universe makes no sense. I am waiting for the guy who is dreaming all of this to wake up and for all of us to stop existing.
See my journal for slashdot ID's by year. Mine created in 2005. http://slashdot.org/journal/289875/slashdot-ids-by-year
I was going to tell you, but I changed the outcome by reading it!
Well, back to rejecting software patent applications.
... but will it run Linux? (Or will it run and not run Linux at the same time?)
You can't know how many cats wide it is or fast it is until you transfer data over it.
that stuff like this is the "glue" behind the universe, and someday, some scientist in a lab is going to have an experiment go horribly wrong?
.. know anybody in Hollywood?
Every time you ________ in Soviet Russia, kitten kills God!
Once quantum computers become mainstream, what will we use for encryption? Are there algorithms that are computable by standard computers but are also unbreakable using quantum computers?
-Bucky
My understanding is quantum entanglement cannot be used to transfer information.
Well, it has never been successfully tested.
change the outcome of the story?
I've had enuff - I'm going Ohm.
One swallow does not a fellatrix make
Yes, D-Wave's device is on a chip, but there are others long before that, too. I am not sure what the first solid-state qubit experiment was, but such experiments have been going on since the late 90's. The claim of these experiments is that they demonstrate the first quantum bus on a chip.
Readers may find the Yale group's press release interesting.
The one time pad, where the key length = message length is still safe as long as you never reuse the key. (the "one time" in one time pad.
As simple proof of this is that for any encrypted text of length N, there exists a key also of length N that will decrypt the etext to any plain text of length N. Therefore there is no way for an attacker to determine if an attempted key is valid or not. There if an attacker were to try every single key of length N, which is possible on some super large future quantum computer, all he will get out is every single decryption of length N, with no way to determine which is correct.
Suppose the plain text was "attack at dawn" and the etext was "xbdhgfhwteriur". After the attacker used his q-computer he'd have "attack at dawn", "attach at noon" and "attack at fred", along with 64 quintillion other combinations.
All ideas^H^H^H^H^Hprocesses in this post are Patent Pending. (as well as the process of patenting all postings)
Yes, because new things should have existing applications. They're new, they enable new. It might not have applicability now, but it might do when google offloads your search to a qbit coprocessor.
It's a good thing Tesla didn't feel the same way about A/C electricity.
I'm pretty sure the IT department in my office has done this many many times. I keep hearing whispers of pulling out all the "Cat 3" that's been "running behind our walls". What happened to the first two cats? And how did Cat 3 escape? We've hired a group of what looks like construction guys, who must really be specialist exterminators because their job is "get rid of any trace of Cat 3". Hmm, I wonder what my company is trying to hide? I overheard my boss tell them that he wants to replace it with "Cat 5". It must be a very stealthy cat, because it's going to "go into every cubicle and every office"! Those strange exterminators suggested "Cat 6", but my boss rejected the idea, saying the Cat 6's plastic core made it very difficult to work with. Now, while I'm already concerned with the idea of zombie ninja cats prowling the office, I certainly will not stand for *bionic* zombie ninja cats!
Solomon
"Twice half-assed makes an ass whole." --Solomon K. Chang
A superposition of states simply means that that the particle has an unknown value for the property being discussed. If you pick any random electron up off the street, its spin along any axis you choose to measure is in a superposition of states such that it might be up or down with equal probability. You can't measure this condition of being in a superposition of states because it is not a property of the electron. Rather, it is a condition of the information that you know about the electron. To use a bad coin flipping analogy, if you flip a coin and cover it before looking, you can say it is in a superposition of states between heads and tails with equal probability of each, not because there is anything special about the coin but because you simply don't know the definite answer.
Entanglement does not allow you to control anything at all about a distant particle. When particles are entangled, that means that measurements taken on both members of an entangled pair will correlate more often than our current understanding of the universe says should be possible. The measuring is a passive thing -- it gets information about the state of the particle. The correlations imply that somehow the entangled particles are linked over distance, or that the future of the pair of particles was predetermined at the time the entangled particles were created.
It cannot be exploited for communication because in order to even detect the strange correlations, you have to compare measurements, which requires getting information about those measurements to a common location. Suppose I'm doing an experiment with entangled photon polarization, and Alice is trying to send a message by modulating the angle of her polarizer. At Bob's detector, he's getting a 50% hit/miss with each photon that comes his way, no matter what angle Alice sets her polarizer to, and his measurement results are completely random.In order for Bob to decode the message, he has to know what Alice's measurements were. This is actually why photon entanglement is useful for encryption -- but it ain't gonna let us talk faster than light.
Fun with Anagarams! LADS HOST, SHALT DOS. HAS DOLTS. AD SLOTHS, HATS SOLD. ASS HO, LTD.