Tag: quantum

Quantum computers reach deeper, find ground state of simple hydrides

Enlarge (credit: IBM ) Every time we discuss quantum computers, the headline tends to be that someone, somewhere is going to use the quantum to break your encryption and steal your student loan. If only that were true. But it is probably more realistic to think about quantum computers being used to solve quantum problems. And this has been demonstrated with recent chemistry calculations using a tiny quantum computer. If solving quantum problems with quantum computers sounds a bit circular, well, it is, but it is also practical. Think of it like this: every protein in your body has the structure it has because of quantum mechanics. And a physicist who is clever, but not intelligent, can write down an exact equation that describes that protein. But not even the most intelligent can solve that equation. Understanding molecules is hard A lazier physicist would write a computer script to solve the equation. But that won’t work either, because the time it takes to solve an exact description of the molecule will take longer than it takes to go from Big Bang to Heat Death. So we live with approximations. Approximations that are mostly pretty good but sometimes fail spectacularly. And, for some molecules, those approximations don’t speed up calculations very much at all. Read 13 remaining paragraphs | Comments

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Quantum computers reach deeper, find ground state of simple hydrides

Los Alamos National Lab has had quantum-encrypted internet for over two years

Nothing locks down data better than a laser-based quantum-encrypted network, where the mere act of looking at your data causes it to irrevocably change. Although such systems already exist, they’re limited to point-to-point data transfers since a router would kill the message it’s trying to pass along just by reading it. However, Los Alamos National Labs has been testing an in-house quantum network, complete with a hub and spoke system that gets around the problem thanks to a type of quantum router at each node. Messages are converted at those junctures to conventional bits, then reconverted into a new encrypted message, which can be securely sent to the next node, and so on. The researchers say it’s been running in the lab for the last two and a half years with few issues, though there’s still a security hole — it lacks quantum integrity at the central hub where the data’s reconverted, unlike a pure quantum network. However, the hardware would be relatively simple to integrate into any fiber-connected device, like a TV set-top box, and is still more secure than any current system — and infinitely better than the 8-character WiFi code you’re using now. Filed under: Science , Internet , Alt Comments Source: Cornell University Library

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Los Alamos National Lab has had quantum-encrypted internet for over two years

MIT demos new form of magnetism that could lead to quantum communication, storage

It’s not often that researchers can verify a discovery that could change how we approach basic principles of technology, not just build on what we know. Nonetheless, MIT might have accomplished just such a feat in demonstrating a new state of magnetism . They’ve shown that a synthetically grown sample of herbertsmithite crystal (what you see above) behaves as a quantum spin liquid: a material where fractional quantum states produce a liquid-like flux in magnetic orientations, even if the material is solid. The behavior could let communications and storage take advantage of quantum entanglement , where particles can affect each other despite relatively long distances. MIT warns us that there’s a wide gap between showing quantum spin liquids in action and developing a complete theory that makes them useful; we’re not about to see Mass Effect ‘s quantum entanglement communicator, if it’s even possible. To us, realizing that there may be a wholly untapped resource is enough reward for now. Filed under: Science , Alt Comments Source: MIT

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MIT demos new form of magnetism that could lead to quantum communication, storage

Researchers stumble onto ‘lava’ generated quantum dots, could power future peripherals

Have you ever been playing around with molten metal salt, when you accidentally created hollow, soft-shelled particles that could one day increase hard disk storage or power future QLED displays ? Us neither, but that’s exactly what happened to scientists at Rice University when they were researching “tetrapods” to make solar panels more efficient. Through an apparently wacky coincidence, they removed a single ingredient from the tetrapod stew, which left behind tiny droplets of cadmium nitrate. Selenium then melted around those drops, which completely dissolved away, leaving a melted selenium ball with a hole in the middle. It turns out that those selenium “doughnuts” can be packed tightly onto a metal surface without touching, thanks to their soft shells, which could allow more bits to be packed onto a hard drive, or be used in quantum computers and next-gen displays. Since the dots are smaller than a living cell, it took the researchers an entire year to figure out what they’d made and how they did it — luckily they didn’t just bin the whole thing and start over. Filed under: Displays , Storage , Science , Alt Comments Via: Extreme Tech Source: IOP Science

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Researchers stumble onto ‘lava’ generated quantum dots, could power future peripherals