Author: Robin Smith
Date: 22:09:19 10/25/02
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On October 25, 2002 at 22:11:36, Bob Durrett wrote: >On October 25, 2002 at 16:17:01, Lieven Clarisse wrote: > >>On October 25, 2002 at 14:42:14, Vincent Diepeveen wrote: >> >>> >>>Can you show me a picture of a quantum? >>> >>>I *can* show you a picture of a real processor. Plenty of them >>>around the net. I can't show you the picture of a quantum. >>> >>>Can you? >>> >>>The things exist for like 1/1000000000000 of a second. >>> >>>How do we create a computer from it if we can't make a clear picture of >>>a quantum? >> >>Not commenting on your specific remarks, you must be joking! >> >> >>IBM had a first 'quantum computer in 2001' >> >>see http://www.research.ibm.com/resources/news/20011219_quantum.shtml >>they managed to factor 15 :). This was a first demonstration, but the methods >>they used are unpractical for real applications. >> >>Recently scientist of the university of Wisconsin have argued that it is >>possible to build a quantum computer with current state of the art. >> >> >>from http://xxx.lanl.gov/abs/cond-mat/0204035 i past: >> >>Design and proof of concept for silicon-based quantum dot quantum bits >> >>Spins based in silicon provide one of the most promising architectures for >>quantum computing. Quantum dots are an inherently scalable technology. Here, we >>combine these two concepts into a workable design for a silicon-germanium >>quantum bit. The novel structure incorporates vertical and lateral tunneling, >>provides controlled coupling between dots, and enables single electron >>occupation of each dot. Precise modeling of the design elucidates its potential >>for scalable quantum computing. For the first time it is possible to translate >>the requirements of fault-tolerant error correction into specific requirements >>for gate voltage control electronics in quantum dots. We demonstrate that these >>requirements are met by existing pulse generators in the kHz-MHz range, but GHz >>operation is not yet achievable. Our calculations further pinpoint device >>features that enhance operation speed and robustness against leakage errors. We >>find that the component technologies for silicon quantum dot quantum computers >>are already in hand. > >Setting all that technical mumbo jumbo aside, what did you just say? [In one or >two sentences, preferably.] That many of the engineering methods used to manufacture digital electronics in silicon may be applicable to future quantum computers. Real world, practical machines may not be as far away as some people might think. Robin
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