Featured Research

from universities, journals, and other organizations

Super-fast Quantum Computer Gets Ever Closer: Quantum Particles Pinned Down

Date:
November 9, 2009
Source:
NWO (Netherlands Organization for Scientific Research)
Summary:
Researchers have succeeded in getting hold of the environment of a quantum particle. This allows them to exercise greater control over a single electron, and brings the team of researchers a step closer still to the super-fast quantum computer.

Researchers at the Kavli Institute for Nanosciences at Delft University of Technology, have succeeded in getting hold of the environment of a quantum particle. This allows them to exercise greater control over a single electron, and brings the team of researchers, led by Vidi winner and FOM workgroup leader Lieven Vandersypen, a step closer still to the super-fast quantum computer.

Their results were published in Nature Physics on 16 August.

One of the unique properties of quantum particles is that they can be in different states at the same time. An atom or electron is then in what is termed a 'superposition' of two conditions. For instance, this means that the 'spin' of an electron can be pointing in two different directions at once. A particle like this can therefore be 0 and 1 at the same time, and not just 0 or 1 as in an ordinary computer connection. This permits super-fast calculations. Until now, however, it has not proved possible to keep a particle in one specific state for any real length of time, because the environment -- which also consists of quantum particles -- is constantly disrupting the state. Researchers have been unable to get to grips with this until now.

Stabilising the pull and push

The researchers in Delft tackled the problem by stabilising the environment. They had already shown that it was possible to direct the spin of an electron using a quantum dot -- a quantum scale box. The problem, however, is that the nuclei in the material of the box also have their own spins. Because spins operate like miniscule magnets, they pull and push the spin of the electron in the box. But that electron is also pushing and pulling in return.

The interaction between the spin of the electron and the spins of the surrounding nuclei was precisely what allowed the researchers to pin down the nuclear spins. They directed an electrical current through the nano-box and thus influenced the spin direction of the nuclei. The interaction between the spin of the electron and the nuclear spins in the environment finally allowed a situation to be created where the nuclear spins no longer varied at random, but actually became relatively stable. This stable environment now makes it possible to preserve the fragile but important superposition for a longer period.

The article by Ivo Vink, Lieven Vandersypen and collegues was published as an Advance Online Publication on the website of Nature Physics on 16 August 2009. A detailed theory about the mechanism behind these experimental observations was elaborated by PhD student Jeroen Danon and collegues, and published recently in the journal Physical Review Letters. The research was funded by NWO and the Foundation for Fundamental Research on Matter (FOM).


Story Source:

The above story is based on materials provided by NWO (Netherlands Organization for Scientific Research). Note: Materials may be edited for content and length.


Cite This Page:

NWO (Netherlands Organization for Scientific Research). "Super-fast Quantum Computer Gets Ever Closer: Quantum Particles Pinned Down." ScienceDaily. ScienceDaily, 9 November 2009. <www.sciencedaily.com/releases/2009/10/091029151439.htm>.
NWO (Netherlands Organization for Scientific Research). (2009, November 9). Super-fast Quantum Computer Gets Ever Closer: Quantum Particles Pinned Down. ScienceDaily. Retrieved April 21, 2014 from www.sciencedaily.com/releases/2009/10/091029151439.htm
NWO (Netherlands Organization for Scientific Research). "Super-fast Quantum Computer Gets Ever Closer: Quantum Particles Pinned Down." ScienceDaily. www.sciencedaily.com/releases/2009/10/091029151439.htm (accessed April 21, 2014).

Share This



More Computers & Math News

Monday, April 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Nintendo Changed Gaming World, but Its Future Uncertain: Upstone

Nintendo Changed Gaming World, but Its Future Uncertain: Upstone

AFP (Apr. 19, 2014) The Nintendo Game Boy celebrates its 25th anniversary Monday and game expert Stephen Upstone says the console can be credited with creating a trend towards handheld gaming devices. Duration: 01:21 Video provided by AFP
Powered by NewsLook.com
Why Did Nike Fire Most Of Its Nike FuelBand Team?

Why Did Nike Fire Most Of Its Nike FuelBand Team?

Newsy (Apr. 19, 2014) Nike fired most of its Digital Sport hardware team, the group behind Nike's FuelBand device. Could Apple or an overcrowded market be behind layoffs? Video provided by Newsy
Powered by NewsLook.com
Nearly Two Weeks On, The Internet Copes With Heartbleed

Nearly Two Weeks On, The Internet Copes With Heartbleed

Newsy (Apr. 19, 2014) The Internet is taking important steps in patching the vulnerabilities Heartbleed highlighted, but those preventive measures carry their own costs. Video provided by Newsy
Powered by NewsLook.com
Facebook To Share Nearby Friends Data With Advertisers

Facebook To Share Nearby Friends Data With Advertisers

Newsy (Apr. 19, 2014) A Facebook spokesperson has confirmed the company will use GPS data from the new Nearby Friends feature for advertising sometime in the future. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins