Author: Bob Durrett
Date: 19:11:36 10/25/02
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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.] Bob D. > >Still a long way to go.. let's talk again within 30-50 years :)
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