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Team Constructs Silicon 2-qubit Gate, Enabling Construction of Quantum Computers (phys.org)
monkeyzoo writes: A team at the University of New South Wales (UNSW) in Sydney has made a crucial advance in quantum computing. Their advance, appearing in the journal Nature (abstract), demonstrated a two-qubit logic gate — the central building block of a quantum computer — and, significantly, did it in silicon. This makes the building of a quantum computer much more feasible, since it is based on the same manufacturing technology as today's computer industry. Until now, it had not been possible to make two quantum bits 'talk' to each other — and thereby create a logic gate — using silicon. But the UNSW team — working with Professor Kohei M. Itoh of Japan's Keio University — has done just that for the first time. The result means that all of the physical building blocks for a silicon-based quantum computer have now been successfully constructed, allowing engineers to finally begin the task of designing and building a functioning quantum computer.
We done got fucked out of good publicly available encryption for decades at least. The beast won. Resistance is futile.
what the meaning of life is.
This step forward makes "quantum computing" real to me. Up till now, it's all been so experimental that it was divorced from engineering, and for me the target of much skepticism. Now that it's being done in silicon, however, it's on its way to being a product. Finally we might get past the hype and see what can actually be delivered!
Socialism: a lie told by totalitarians and believed by fools.
What kind of gains are we talking about in the move to quantum computing?
Does Moore's law go out the window and usher in a new golden age of man, or is this just another incremental improvement?
Are the decoherence problems also dealt with or are they just demonstrating entanglement of silicon qubits? I had thought the significant problem was getting qubit fidelity up to the level where quantum error correction could be successfully implemented, not necessarily what material was used. Of course, getting the thing to work in a manner that takes advantage of modern industrial methods is advantageous, but it seems like they are selling it as the magic bullet for quantum computing.
So we can try and factor 0,1,2 and 3?
I should use this sig to advertise my book ISBN-13 : 978-1501515132.
From the article video it seems all they did is create gates where the spin of one electron codifies ones and zeros. A quantum computer is much more than that. Basically you need to surround a number of qubits by a device (circuit?) that makes the qubits to collapse to the solution of the problem in question. I don't think you can do that with gates!
What is with Slashdot and daily biased Uber stories?
Anybody knows a good slashdot alternative? Not about reading the news, but reading nice debates in the comments.
The real problem with quantum computers is noise and decoherence. To make a practical quantum computer you need three things:
1) Qubits thare are very loosely coupled with the environment so they have a long decoherence time
2) A way of coupling these qubits to each other without destroying (1).
3) A way of reading from and writing to qubits without destroying (1) or (2).
I *think* this paper claims to have solved (2) and (3). I believe (1) had previously been solved by the use of electron spin with atoms of Silicon-28 which this paper uses as well. Do a search for "qubit silicon 28". I think a saw a measured decoherence time of 200 microseconds. This would mean that a calcuation would need to be completed in well under this time in order to not get swamped out by noise from the environment.
We don't see the world as it is, we see it as we are.
-- Anais Nin
for how long the shadow agencies had this tech?
I mean really, there are dedicated programs/operations to siphon off precisely these kinds of advancements, and subvert them for selfis
[BALD_EAGLE_CRYING_OVER_FLAG.JPG]
So assuming this is indicative of more silicon-based quantum building blocks to come, we can't be further than a decade or two away from 3 letter mafias using the new shiny toy to attack cryptography.
RSA, DSA, ECC and the likes are immediately fucked. Symmetric encryption algorithms such as AES now need twice the key length for the same security, same with hash functions.
This means everything we currently have is broken and usable post-quantum crypto is going to come 5-10 years too late at this rate!
How much closer they are to a Beowulf cluster of these...
deleting the extra space after periods so i can stay relevant, yeah.
And will it be able to run any business warehouse?
Guys, quantum computers don't exist yet, and won't be viable for at least several more years, perhaps even a few decades. If you're worried about your precious data encryption, don't, because the world governments already got that shit cracked. You're on the internet right now, posting on Slashdot, being tracked by god knows how many corporations, educational institutions, and local to worldwide government entities. That is like complaining to a prison guard that your toilet doesn't have a stall door.
why do you hate fruity cab tales
in case you need 0,1,2 or 3 factored really, reaaly fast.
Science, huh?
All quantum computer has an entanglement problem.
All non-quantum computer has not an entanglement problem.
Think twice before of buying a computer. It costs money $$$.
2-qubit computer doesn't make twice faster for your applications, by example, 3D rendering.
For more info, https://en.wikipedia.org/wiki/...
also available here
http://arxiv.org/abs/1411.5760
It makes a chinese go very fast. Like Starfarft.
You can go to a chinky intercafe and play until a heart attack, much faster. Maybe four time faster
Your thinking around seriol operations. Get a heart-attack soon, okay
Question to anybody who knows, not to the many who issue apocalyptic forecasts from their (at best) passing acquaintance with the issues involved: What does this mean? Does it mean that building a quantum computer able to factorize large integers efficiently is around the corner - i.e. just a few years away? Or does this just bring us closer to understanding whether or not building such a quantum computer is a feasible undertaking, even though it might be decades before that is accomplished?
My question is, if qubit gates have just been discovered, what the heck has D-Wave Systems been selling to Google and NASA in the past 2 years?
OHHHHH
and how do I represent a logic circuit gate with it?
Precious few details in the article
It's a refrigeration problem.
You need to get stuff very cold to dampen down the noise (other things entangling with your qbits).
Making things cold takes energy. The lower the entropy in the qbits, the higher the energy that you blow in the refrigeration. Overall entropy will increase. So you might be able to equate the energy in the heat of serial computation of an O(2^n) problem to the energy spent cooling a circuit cold enough to solve an O(2^n) problem in parallel with magic quantum behaviors. Unfortunately in the parallel case you have to blow that energy all at the same time. If the serial case looks like it would need enough energy to boil all the oceans (about O(2^128)) then the parallel case might boil them all at once. You might want to get inland.
I should use this sig to advertise my book ISBN-13 : 978-1501515132.
Construction on my cold fusion reactor has been held up waiting for the quantum computer to run it.
Quantum Computers already exist...
http://www.dwavesys.com/d-wave-two-system
Perhaps TFA could be more specific on what aspect this changes.
I may misunderstand this -- my quantum physics are hazy at best -- but I am under the impression that "brute force" isn't the leverage that quantum computing will apply to the problem.
Can anyone who actually understands what a quantum computer could do give us (ok, me) a lesson on the nature of the threat to encryption?
I've fallen off your lawn, and I can't get up.
Or build a moon cluster
Hi everyone,
If you don't have a subscription to Nature, you download a copy of the preprint from arxiv.org at this link.
http://arxiv.org/pdf/1411.5760.pdf
Enjoy! This is great Science. Even without the really cool Quantum effects, this technology has potentially far higher logic densities than CMOS.
The original Xbox's 2048-bit RSA key and I have some unfinished business from more than a decade ago.
"Screw Sun, cross-platform will never work. Let's move on and steal the Java language." - Visual J++ Product Manager
No more locked bootloaders like Secure Boot or iBoot.
"Screw Sun, cross-platform will never work. Let's move on and steal the Java language." - Visual J++ Product Manager
http://www.engineering.unsw.ed... http://www.cqc2t.org/research And the patent docs https://register.epo.org/appli...
Imagine a Beowulf cluster of these! Sorry, been wanting to say that for years ...
Sorry, but every time I dig into this, it seems to reduce to a complicated version of trying to get something out of a balanced system which won't budge due to the Laws of Reality.
If you could just get one of those fridge magnets to turn off for half the engine cycle, you could build a truly awesome car! But fridge magnets don't give free lunches.
Similarly, if try to pull a measurement out of your q-bit, it stops being in super position and just becomes another dumb binary switch.
Solving a problem is the same as trying to sneak an observation of particles acting as waves.
If your quantum computer solves a problem, an encryption riddle, for instance, then that proves its q-bits were in superposition, which instantly means they weren't.
I thought the double slit experiment adequately demonstrated this.
I suspect that the only solutions to this reality gridlock can be found by the likes of Douglas Adams. Though, spending billions of dollars and hundreds of thousands of research hours on the problem is pretty close to the kind of narrative Douglas Adams enjoyed telling.
How many moons do you need to make an effective cluster?
I should use this sig to advertise my book ISBN-13 : 978-1501515132.