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Researchers Develop Quantum Device to Control Single Electron Spin
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Written by Daniel   
Thursday, 18 October 2007 11:38

Researchers Develop Quantum Device to Control Single Electron Spin
Marcus Yam (Blog) - October 17, 2007 1:48 PM

Daily Tech 

 Semiconductor can trap, detect and manipulate electron spin at 20 kelvins
Quantum computing is still out of reach for most mainstream industries, but continuing research in the field is making the technology more accessible. A team of engineers at the University at Buffalo have developed a semiconductor that can trap, detect and manipulate the single spin of an electron.



"The task of manipulating the spin of single electrons is a hugely daunting technological challenge that has the potential, if overcome, to open up new paradigms of nanoelectronics," said Jonathan P. Bird, Ph.D., professor of electrical engineering in the UB School of Engineering and Applied Sciences and principal investigator on the project.

The research paper (PDF) detailing the advancement is featured in this week’s Physical Review Letters. "In this paper, we demonstrate a novel approach that allows us to easily trap, manipulate and detect single-electron spins, in a scheme that has the potential to be scaled up in the future into dense, integrated circuits," added Bird.

The system developed at UB steers the electrical current in a semiconductor by applying voltage to nanoscale gaps on select metallic gates that are fabricated on its surface.

"As we increase the charge on the gates, this begins to close that gap," explained Bird, "allowing fewer and fewer electrons to pass through until eventually they all stop going through. As we squeeze off the channel, just before the gap closes completely, we can detect the trapping of the last electron in the channel and its spin."... More    Comments in the Forum
 
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