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量子技术的重大突破:未来可以预见用量子计算机运行Folding@home
详细文章:
ONE QUANTUM LEAP
Researchers have successfully teleported information from one trapped atom to another one sealed up in a container sitting 3.3 feet (1 meter) away. That's one small step for teleportation, and one quantum leap for code-makers and code-breakers.
But if you're waiting for the kind of teleporter that can beam Captain Kirk down from the Starship Enterprise ... well, don't hold your breath.
"The term 'teleportation' is a little weird," research team leader Christopher Monroe told me today. "When people see that word they think of Captain Kirk, and that's a big problem."
That's not to say that this kind of teleportation is ho-hum physics: Albert Einstein called it "spooky action at a distance" and thought it couldn't be done. But quantum teleportation, as in the transfer of information from one place to the other without passing through any physical medium, has been in the works for more than a decade.
Over the years, teleportation experiments have demonstrated that quantum states - for example, the spin of a particle or the polarization of a photon - can be teleported using a variety of methods. But the researchers behind the latest experiment, reported in Friday's issue of the journal Science, claim that this is the first time information has been teleported between two separate atoms in unconnected enclosures.
That's the kind of setup that makes the most sense for super-secure communication systems, as well as for super-smart computers that could break today's cryptographic codes or sort through huge databases.
"Our system has the potential to form the basis for a large-scale 'quantum repeater' that can network quantum memories over vast distances," Monroe, a physicist at the University of Maryland, said in a news release issued today. "Moreover, our methods can be used in conjunction with quantum bit operations to create a key component needed for quantum computation."
The experiment was run by Monroe and other researchers at the Joint Quantum Institute, a partnership between the University of Maryland and the University of Michigan. If you don't need to know the details about how the feat was done, and you don't want to risk getting your brain twisted in a knot (as mine was), skip the next section and resume reading about "the next giant leaps."
for more: http://cosmiclog.msnbc.msn.com/archive/2009/01/22/1757398.aspx |
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