Researchers at the University of Wisconsin in Madison claim to have created the worlds first successful simulation of a quantum-computer architecture that uses existing silicon fabrication techniques. By harnessing both vertical and horizontal tunneling through dual top and bottom gates, the architecture lays out interacting, 50-nanometer-square, single-electron quantum dots across a chip."Our precise modeling elucidates the specific requirements for scalable quantum computing ? for the first time we have translated the requirements for fault-tolerant quantum computing into the specific requirements for gate voltage control electronics in quantum dots," said professor Mark Eriksson of the universitys Department of Physics. The group of researchers has concluded that existing silicon fabrication equipment can be used to create quantum computers, albeit at only megahertz speeds today due to the stringent requirements of its pulse generators. To achieve gigahertz operation, the group has pinpointed the device features that need to be enhanced to prevent leakage errors, and has already begun work on fabricating a prototype.
http://www.eetimes.com/at/news/OEG20020806S0030
