Linked by Eugenia Loli on Tue 1st Jul 2008 23:03 UTC
Hardware, Embedded Systems Quantum computers could become a reality very soon, opening up some fantastic possibilities -- including tele-portation, says Richard Gray.
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but the point is that adding a qbit to a QC doubles its memory. It can represent 2^n states simultaneously, so, increasing n by one, doubles the memory.

The point of QC is that classically there is a minimum power associated with the processing of 1bit. A quantum computation is reversible, meaning that it does not dissipate power.

In fact, you can classify codes by how much energy you would need to crack that code. You might not know how powerful a supercomputer your enemy can build, but you can state how much it would cost in energy, and put a price on that information.

I am completing my PhD in experimental QC, and I tell you, we are far far from building anything useful. We can simulate about 25qbits on a mac pro, and experimentally only do about 7. With the exponential difficulty in adding them, it will take some time before we catch up. But when power really starts to be an issue, QC will be there.

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