Subject:
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Big Quantum computer designed at UW Madison
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Newsgroups:
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lugnet.off-topic.geek
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Date:
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Thu, 8 Aug 2002 01:29:52 GMT
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Viewed:
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267 times
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For fans of dots in a regular grid, meet the 50nm scale:
http://www.eetimes.com/at/news/OEG20020806S0030
Quantum computer called possible with today's tech
My understanding:
Using design rules for conventional chip fabrication, researchers at
University of Wisconsin (Madison) have simulated a quantum computer and
think it possible to make an array of 1 million qubits, operating at
megahertz speeds. With some tuning, gigahertz speeds. This indicates that
current semiconductor fabrication technology is adequate for constructing
quantum computers.
The array's qubits are vertical slots or wells, just long enough to
accomodate a single electron, which is initially acquired, via tunneling,
from a substrate layer. The wells are isolated from each other by
macro-scale gates with large eletrostatic charge. The gates are manipulated
to enable neighboring cells to interact via horizontal tunneling.
--
With a quantum computer of this size, the challenges will be programming it
and reading the results. I'm not too clear on what the programs are expected
to do.
It's often supposed that a quantum multiplier could simultaneously find all
factors of a really big number or solve NP-hard problems. One imagines the
rate of new prime number discovery accelerating.
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