Featured Research

from universities, journals, and other organizations

Quantum information motion control is now improved

Date:
April 3, 2012
Source:
Springer
Summary:
Physicists have recently devised a new method for handling the effect of the interplay between vibrations and electrons on electronic transport. This study could have implications for quantum computers due to improvements in the transport of discrete amounts of information, known as qubits, that are encoded in electrons.

Physicists have recently devised a new method for handling the effect of the interplay between vibrations and electrons on electronic transport. Their paper is about to be published in The European Physical Journal B. This study, led by scientists from Zhejiang University, Hangzhou, China, and the Centre for Computational Science and Engineering at the National University of Singapore, could have implications for quantum computers due to improvements in the transport of discrete amounts of information, known as qubits, that are encoded in electrons.

Related Articles


The authors created an electron transport model to assess electrons' current fluctuations when they are subjected to quantized modes of vibration, also known as phonons. In the model, phonons are induced by a nanomechanical resonator. To better monitor electron transport, it is coupled to a system that was chosen for its ability to confine one or several electrons, called double quantum dot (DQD). Unlike previous studies, this work imposed arbitrary strong coupling regimes between electrons in the DQD and the phonons produced by the resonator.

The authors successfully controlled the excitations of the phonons without impacting the transport of quantum information. To do so, they decoupled the electron-phonon interaction by the so-called coherent phonon states method, which is based on reaching resonance modes of phonons. They have shown that when the energy excess between the two quantum dots of the DQD system is sufficient to create an integer number of phonons, electrons can reach resonance and tunnel from one quantum dot to the other. In strong electron-phonon coupling regimes, multi-phonon excitations can thus enhance the electron transport.

As the electron-phonon coupling becomes even stronger, the phenomenon of phonon scattering represses electron transport and confines the electrons. The fluctuations of electron current could therefore be controlled by tuning the electron-phonon coupling, which makes it a good quantum switch to control the transport of information in quantum computers.


Story Source:

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


Journal Reference:

  1. C. Wang, J. Ren, B. W. Li, Q. H. Chen. Quantum transport of double quantum dots coupled to an oscillator in arbitrary strong coupling regime. The European Physical Journal B, 2012; 85 (3) DOI: 10.1140/epjb/e2012-30027-1

Cite This Page:

Springer. "Quantum information motion control is now improved." ScienceDaily. ScienceDaily, 3 April 2012. <www.sciencedaily.com/releases/2012/04/120403111858.htm>.
Springer. (2012, April 3). Quantum information motion control is now improved. ScienceDaily. Retrieved January 26, 2015 from www.sciencedaily.com/releases/2012/04/120403111858.htm
Springer. "Quantum information motion control is now improved." ScienceDaily. www.sciencedaily.com/releases/2012/04/120403111858.htm (accessed January 26, 2015).

Share This


More From ScienceDaily



More Computers & Math News

Monday, January 26, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

How Technology Is Ruining Snow Days For Students

How Technology Is Ruining Snow Days For Students

Newsy (Jan. 25, 2015) — More schools are using online classes to keep from losing time to snow days, but it only works if students have Internet access at home. Video provided by Newsy
Powered by NewsLook.com
Sundance Films Tap Into Virtual Reality

Sundance Films Tap Into Virtual Reality

Newsy (Jan. 25, 2015) — Virtual reality headsets offer more experiences for viewers and filmmakers at the Sundance Film Festival. Video provided by Newsy
Powered by NewsLook.com
No, A Google Exec Did Not Predict An Internet Apocalypse

No, A Google Exec Did Not Predict An Internet Apocalypse

Newsy (Jan. 24, 2015) — Earlier this week, a Google exec made headlines for saying "the Internet will disappear," but that doesn&apos;t quite mean what it sounds like. Video provided by Newsy
Powered by NewsLook.com
Tim Cook Made 8 Times Less Than Another Apple Exec In 2014

Tim Cook Made 8 Times Less Than Another Apple Exec In 2014

Newsy (Jan. 23, 2015) — Tim Cook&apos;s total compensation more than doubled in 2014 to $9.2 million, but his pay was still less than four other Apple executives. 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:

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