The Latest In Quantum-Dot Switches
Quantum-dot switches made up of pairs of tiny puddles of forty to sixty paired electrons show promise as the building blocks for quantum computers. Each dot is only 200 nanometers wide. The two puddles are placed inside a semiconductor; each puddle is given a final, unpaired electron which gives the quantum dot a net spin of up or down. Finally, the two dot system is tuned so that the two unpaired electrons become "entangled" - that is, they begin to interact with each other.
(From Press Release)
"Entanglement is a key property that would help give a quantum computer its power," says lead researcher Albert M. Chang, adjunct professor of physics in Purdue's School of Science. "Because each system exists in this mixed, down-up configuration, it may allow us to create switches that are both on and off at the same time. That's something current computer switches can't do."
The hope for quantum computing is that, since a quantum computer's bits could be in two quantum states at once - both on and off - it might be possible to explore many different solutions simultaneously. "These computers would have massive parallelism built right in, allowing for the solution of many tough problems," Chang said. "But for us physicists, the possibilities of quantum computers extend beyond any single application. There also exists the potential to explore why there seem to be two kinds of reality in the universe – one of which, in everyday language, is said to stop when you cross the border 'into the interior of the atom.'"
It is hoped that this method of producing qubits - quantum bits - will scale into large systems, a key advantage over previous methods. The speed at which Chang's qubit works is too slow for a marketable device; speed improvements are next.
SF author Greg Bear writes about a quantum logic thinker in his 1990 novel Heads.
See the news release Quantum computers are a quantum leap closer, say Purdue physicists.
Scroll down for more stories in the same category. (Story submitted 4/30/2004)
Follow this kind of news @Technovelgy.
| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |
you like to contribute a story tip?
Get the URL of the story, and the related sf author, and add
Comment/Join discussion (Back On) ( 1 )
Related News Stories -
Fujitsu Touchscreen Mixes Real And Virtual Worlds
'His hands flashed over the keyboard - it had not been there a moment before, but it was operative...'- Frederik Pohl, 1965.
Nanowire Memristor Networks Form 'Brains'
'He had constructed ... a brain, of metal... whose atomic structure he claimed was analogous to the atomic structure of a living brain.'- Edmond Hamilton, 1926.
US Census Will Be Online In 2020
'Most would be in English, but some would be in Spanish, some in Amerind languages, some in Chinese...'- John Brunner, 1975.
Wireless Brain-Computer Interface
'I used my implant to tell MILLIE [a mainframe computer] what we wanted and she took care of it," Art said.'- Pournelle and Niven, 1981.
Technovelgy (that's tech-novel-gee!)
is devoted to the creative science inventions and ideas of sf authors. Look for
the Invention Category that interests
you, the Glossary, the Invention
Timeline, or see what's New.
MIT Robot Cheetah Video Shows Gait Transition
'The legs are long, curled way up to deliver power, like a cheetah's.'
TrackingPoint Smart Rifle
Not your typical 'smart bullet' approach.
'Hello, Computer!' Google Now Highlighted at IO13
Sky City's 220 Stories Are Go
'It rested among green parklands and... stood in total isolation, a glittering block of whites and flashing windows dotted with colors.'
CARMAT Bioprosthetic Total Human Heart Replacement
'George Walt's corporate existence proved the workability of wholly mechanical organs...'
Personal Sniffer Robots
'...The ticking combinations of the olfactory system of the hound.'
Physical Exam? We've Got Apps
See the future of handheld, personal medical devices.
The Interplanetary Internet, Vint Cerf Speaking
'This was the center of Interplanetary Communications.'
Drosophila Robotica, The Mechanical Fly
'... the Scarab [flying robot] buzzed into the great workroom as any intruding insect might...'
Robo-Raven Flapping Wing Robot Bird
'When he had first built them, they had been crude indeed, flying mechanisms with little more than a reflex-response unit.'
Japan's Nursing Home Robot Plan
Let's make the Roujin Z-0001 Robotic Bed!
Samsung Smart TVs With Gesture Control
'He waved his hand and the circuit switched abruptly.'
Swiss HCPVT Giant Photovoltaic 'Flower'
'...leaning against one of the slender stalks of a sunshade-photocell collector.'
Mini-Livers Made By 3D Printer
Organleggers may experience an employment downturn.
Smartphone Sensor System Tracks Gunfire
'Sound trackers on the roof could zero in on weapons action...'
Bacteria Now Make Biofuel Like Oil
'They have ... germs that eat pretty near anything, and produce oil as a waste product.'
More SF in the News Stories
More Beyond Technovelgy science news stories