backtop


Print 38 comment(s) - last by Fritzr.. on Jan 15 at 5:52 PM

One piece closer to a working electronic quantum computer puzzle kit.

Many believe the next generation of supercomputers will be powered by quantum mechanics. Harnessing the strange properties of photons and electrons in special states is often the backbone for quantum computer research. Some of these seemingly exotic properties have already been demonstrated using photons, but until very recently, were not replicated in solid-state systems by electrons.

A group of European researchers, consisting of institutions from France, Spain and Germany, has published their work with quantum entanglement using electron (Cooper) pairs, quantum dots and carbon nanotubes. Quantum entanglement is a quantum state of matter where two particles, typically photons or electrons, form a matched pair based on their physical qualities such as up or down spin for electrons and polarization for photons. When a pair of these particles becomes entangled, quantum mechanics states that measuring one of the pair will instantly force the unmeasured into a corresponding state, regardless of the distance they have been separated by.

In photonics work, researchers used wave guides and polarization filters to form entangled photons, which can then be separated by a beam splitter and measured individually. But for electrons, the work is far more taxing. Measurements are more easily skewed by background noise and leakage from the components of the test device.

The solid-state device used to confirm electron quantum entanglement is fairly simple in design. A superconducting element is used to form Cooper pairs. The pairs then move down the element towards a carbon nanotube. Occasionally the pair is split by the nanotube and each electron moves towards a separate quantum dot. In this time, one electron’s spin can be measured, which infers the spin of its mate instantaneously. These pairs can either be spin-correlated or anti-spin-correlated (spinning in the same direction or opposite directions), but the measurement of one always reveals the properties of the other.

Quantum entanglement could be very useful in theory, especially for quantum computing in the areas of security and data transmission. Theoretically, data can be transferred over any distance instantly and without any risk of security breech, however, the entangled pair still has to be transferred through physical media at this time.



Comments     Threshold


This article is over a month old, voting and posting comments is disabled

By Mitch101 on 1/13/2010 10:42:39 AM , Rating: 2
91TTZ: I have a radical idea. The door swings both ways, we could reverse the particle flow through the gate.
Dr. Peter Venkman: How?
91TTZ: [hesitates] We'll cross the streams.
Dr. Peter Venkman: 'Scuse me 91TTZ? You said crossing the streams was bad!
91TTZ: Cross the streams...
Dr. Peter Venkman: You're gonna endanger us, you're gonna endanger our client - the nice lady, who paid us in advance, before she became a dog...
91TTZ: Not necessarily. There's definitely a *very slim* chance we'll survive.
[pause while they consider this]
Dr. Peter Venkman: [slaps Ray] I love this plan! I'm excited to be a part of it! LET'S DO IT!


By MrBlastman on 1/13/2010 12:36:32 PM , Rating: 2
Brings a new meaning to the phrase "the old ball and chain."

What did the newly paired electron say to its mate?

"Hey babe, you make my head spin," the electron said to the other electron as she played on the round-a-bout.

It's true folks, even at the subatomic level it has been proven that female electrons tend to discombobulate a perfectly normal, sane male electron once they tie the knot.


"I'd be pissed too, but you didn't have to go all Minority Report on his ass!" -- Jon Stewart on police raiding Gizmodo editor Jason Chen's home











botimage
Copyright 2014 DailyTech LLC. - RSS Feed | Advertise | About Us | Ethics | FAQ | Terms, Conditions & Privacy Information | Kristopher Kubicki