The impending revolution of low-power quantum computers

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lotuseclat79

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The impending revolution of low-power quantum computers.

By 2017, quantum physics will help reduce the energy consumption of our computers and cellular phones by up to a factor of 100. For research and industry, the power consumption of transistors is a key issue. The next revolution will likely come from tunnel-FET, a technology that takes advantage of a phenomenon referred to as "quantum tunneling.".


Quantum tunnel depiction: Credit: © _pop_eye
Related articles you might find interesting: 11 nanometer with regard to 6nm (mentioned in the 2nd paragraph) comments about the Quantum tunnelling effect.

-- Tom
 
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That article is very misleading. It has nothing whatever to do with "quantum computers", just a quantum effect that has been known for several decades and is already used extensively in modern technology. The article in fact talks about what is in effect an extension of Moore's Law with better transistors, components that most likely will have nothing at all to do with quantum computing.

Most people don't realize that even humans "tunnel" to a degree (using an expanded meaning to that term that does not involve passing through an energy barrier). Walking across a room, for example, we disappear and reappear trillions of times without ever having existed at all in the space in between at a frequency inversely proportional to our mass.

But, it is an interesting article in its own right. FET's are remarkable components and can be constructed using graphene.
 

lotuseclat79

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Hi Elvandil,

Can you prove that you disappear/reappear trillions of times without ever having existed at all in the space in between at a frequency inversely proportional to your mass? Just because you imagine it, does not make it true.

The article is only attempting to explain the challenges to getting to a practical quantum computer in the next 10 years or so to the layperson masses about a scientific barrier to its success.

Why do you think graphene and other materials are under such intense scrutiny? Properties of materials have a huge significance in the quest for quantum computers. We shall see which strategies succeed.

-- Tom
 
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LOL. Well, no, I can't prove any of quantum theory, but that it what it says about all objects. Certainly I could easily find references to measurements with smaller objects. But I wonder actually why that would surprise you since that is exactly what happens in quantum tunneling. The electron's probability density moves from one location to another through a barrier where its probability of existence is 0, so it is just the same thing on a larger scale.

Yes, graphene, being the new kid, is certainly attracting lot of attention. There are 100's of journal articles every month. But some researchers are wondering why it gets so much attention when similar and possibly better materials are being ignored. The shine will wear off eventually, and we'll find many such materials that will change a lot of present technology.

But certainly quantum computers would never use semiconductors. That is contrary to the whole idea behind them, that 0' and 1's are not sufficient for quantum calculation.

From Wikipedia (I know - I don't trust it with everything, either, but it states the principle well):

The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and that the frequency is directly proportional to the particle's kinetic energy. The wavelength of matter is also called de Broglie wavelength.
- Wikipedia, "Matter Wave"
 
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