2004-07-23, 02:48
#1
Det här kan vara det första stora steget mot praktiska quantumdatorer på marknaden. http://newsroom.ucla.edu/page.asp?RelNum=5356
Forskare på UCLA har lyckats med konststycket att manipulera och detektera ändringar på en enskild elektron i en transistor. Är det kanske dags att börja lobba för quantumkryptering?
Forskare på UCLA har lyckats med konststycket att manipulera och detektera ändringar på en enskild elektron i en transistor. Är det kanske dags att börja lobba för quantumkryptering?
Citat:
The UCLA team succeeded in flipping a single electron spin upside down in an ordinary commercial transistor chip, and detected that the current changes when the electron flips. Their report of controlling and detecting a single electron's spin is published in the July 22 issue of Nature.
Scientists had manipulated millions of electron spins in a transistor before. "We have gone from millions to just one," said Hong Wen Jiang, a UCLA professor of physics and member of the California NanoSystems Institute, in whose laboratory the experiments were conducted.
"Our research demonstrates that an ordinary transistor, the kind used in a desktop PC or cell phone, can be adapted for practical quantum computing," Jiang said. The research makes quantum computing closer and more practical, he added.
A single electron spin represents a quantum bit, the fundamental building block of a quantum computer.
Many scientists believe that an exotic new technology would be required for quantum computing. However, Jiang said, "I would not be surprised one day to see a quantum computer built, based almost entirely on silicon technology."
"We have measured a single electron spin in an ordinary transistor; this means that conventional silicon technology is adaptable enough, and powerful enough, to accommodate the future electronic requirements of new technologies like quantum computing, which will depend on spin," said Eli Yablonovitch, UCLA professor of electrical engineering, director of UCLA's Center for Nanoscience Innovation for Defense, member of the California NanoSystems Institute and co-author of the Nature paper.
"We've done this with a commercial silicon integrated circuit chip, literally off a shelf," Yablonovitch said. "Silicon is the dominant technology of our time, and will remain so for some time. For those who think silicon has too many limitations, silicon technology is surprisingly adaptable, enough so to meet the futuristic requirements of the 21st century. In the electronics of the 21st century, we will manipulate single electron spins — not just the charge of the electron, but the spin of the electron."
Scientists had manipulated millions of electron spins in a transistor before. "We have gone from millions to just one," said Hong Wen Jiang, a UCLA professor of physics and member of the California NanoSystems Institute, in whose laboratory the experiments were conducted.
"Our research demonstrates that an ordinary transistor, the kind used in a desktop PC or cell phone, can be adapted for practical quantum computing," Jiang said. The research makes quantum computing closer and more practical, he added.
A single electron spin represents a quantum bit, the fundamental building block of a quantum computer.
Many scientists believe that an exotic new technology would be required for quantum computing. However, Jiang said, "I would not be surprised one day to see a quantum computer built, based almost entirely on silicon technology."
"We have measured a single electron spin in an ordinary transistor; this means that conventional silicon technology is adaptable enough, and powerful enough, to accommodate the future electronic requirements of new technologies like quantum computing, which will depend on spin," said Eli Yablonovitch, UCLA professor of electrical engineering, director of UCLA's Center for Nanoscience Innovation for Defense, member of the California NanoSystems Institute and co-author of the Nature paper.
"We've done this with a commercial silicon integrated circuit chip, literally off a shelf," Yablonovitch said. "Silicon is the dominant technology of our time, and will remain so for some time. For those who think silicon has too many limitations, silicon technology is surprisingly adaptable, enough so to meet the futuristic requirements of the 21st century. In the electronics of the 21st century, we will manipulate single electron spins — not just the charge of the electron, but the spin of the electron."
