Featured Research

from universities, journals, and other organizations

Turning down the noise in quantum data storage

Date:
January 19, 2010
Source:
American Physical Society
Summary:
Tripling the steps in a read cycle can significantly improve signal to noise ratios in quantum data storage.

Driving a qubit along a longer quantum path (routes 2 and 3) dramatically improves the signal quality over that achieved by following the shorter path (route 1). The research applies to information stored in qubits that consisted of Nitrogen-based defects in diamond, as schematically shown on the right.
Credit: Alan Stonebraker

Researchers who hope to create quantum computers are currently investigating various methods to store data. Nitrogen atoms embedded in diamond show promise for encoding quantum bits (qubits), but the process of reading the information results in an extremely weak signal.

Related Articles


Now physicists have demonstrated a roundabout approach for generating a significantly stronger signal from these sorts of qubits. Their experiment is reported in the current issue of Physical Review B and highlighted with a Viewpoint in the January 19 issue of Physics.

In a quantum computer, a single bit of information is encoded into a property of a quantum mechanical system -- the spin of an electron, for example. In most arrangements that rely on Nitrogen atoms in diamond to store data, reading the information also resets the qubit, which means there is only one opportunity to measure the state of the qubit. By developing a technique that involves the spin of the Nitrogen nucleus in the process as well, a team of physicists at the University of Stuttgart in Germany has turned the single step read-out into a multi-step process.

Rather than simply resetting the electron-based qubit when the information is read, the researchers discovered that they can force the state of the Nitrogen nucleus to change state twice before the information in the qubit is finally erased. The state of the Nitrogen nucleus doesn't store any useful information, it simply allows the researchers to add steps to the process of reading the qubit's state. This results in a more convoluted quantum mechanical process that triples the number of events that occur before information is destroyed, which in turn strengthens the signal revealing information stored in the qubit.

The resulting signal is still weak, but by combining other clever methods to the problem researchers might one day be able to use impurities in diamond to read and write quantum information at room temperature -- which would bring us much closer to creating practical quantum computers.


Story Source:

The above story is based on materials provided by American Physical Society. Note: Materials may be edited for content and length.


Cite This Page:

American Physical Society. "Turning down the noise in quantum data storage." ScienceDaily. ScienceDaily, 19 January 2010. <www.sciencedaily.com/releases/2010/01/100119103557.htm>.
American Physical Society. (2010, January 19). Turning down the noise in quantum data storage. ScienceDaily. Retrieved January 29, 2015 from www.sciencedaily.com/releases/2010/01/100119103557.htm
American Physical Society. "Turning down the noise in quantum data storage." ScienceDaily. www.sciencedaily.com/releases/2010/01/100119103557.htm (accessed January 29, 2015).

Share This


More From ScienceDaily



More Computers & Math News

Thursday, January 29, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

'Brand Blocker' Glasses Blur Ads in Real Time

'Brand Blocker' Glasses Blur Ads in Real Time

Buzz60 (Jan. 28, 2015) A team of college students design and build a pair of goggles that will obscure any corporate branding from your field of vision. Jen Markham (@jenmarkham) has the story. Video provided by Buzz60
Powered by NewsLook.com
iPhone Sales Give Apple Record Quarter

iPhone Sales Give Apple Record Quarter

AP (Jan. 28, 2015) Apple says staggering consumer demand for new iPhones has helped the company report record-smashing earnings for its latest quarter and primed its stock for a rally. (Jan. 28) Video provided by AP
Powered by NewsLook.com
Google Fiber Pressures Incumbent ISPs With Latest Expansion

Google Fiber Pressures Incumbent ISPs With Latest Expansion

Newsy (Jan. 28, 2015) Google’s newly announced Fiber cities put it in closer competition with the likes of AT&T and Time Warner Cable. Video provided by Newsy
Powered by NewsLook.com
Google High-Speed Service Coming to 4 Cities

Google High-Speed Service Coming to 4 Cities

AP (Jan. 28, 2015) Google is expanding its fiber-optic high-speed internet service to four cities in the Southeastern US. The company selected Atlanta, Charlotte, Raleigh and Nashville and their surrounding communities. (Jan. 28) Video provided by AP
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:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

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