Featured Research

from universities, journals, and other organizations

New scheme for photonic quantum computing

Date:
October 13, 2011
Source:
University of Vienna
Summary:
The concepts of quantum technology promise to achieve more powerful information processing than is possible with even the best possible classical computers. To actually build efficient quantum computers remains a significant challenge in practice. A new scheme, called "coherent photon conversion," could potentially overcome all of the currently unresolved problems for optical implementations of quantum computing.

This is a photograph of the preparation setup for the strong green pump laser used for enhancing the nonlinearity for coherent photonic conversion.
Credit: Image courtesy of IQOQI Vienna

The concepts of quantum technology promise to achieve more powerful information processing than is possible with even the best possible classical computers. To actually build efficient quantum computers remains a significant challenge in practice. A new scheme, called "coherent photon conversion," could potentially overcome all of the currently unresolved problems for optical implementations of quantum computing.

The international team of scientists led by researchers from the Vienna Center for Quantum Science and Technology (VCQ) at the University of Vienna (group of Anton Zeilinger) introduces this new scheme this week in Nature.

A new way for photons

Quantum technology derives its potential by exploiting uniquely quantum features such as superposition and entanglement. Single photons are excellent quantum information carriers, because they are naturally almost perfectly isolated from their environment. Also, quantum computers based on photons promise to be extremely fast. But current schemes for preparing, processing and measuring photons are inefficient.

The new scheme provides a method of coherent conversion between different photon states and is based on enhancing the nonlinearity of a medium by a strong laser field. The method paves a road to solving all open challenges for optical quantum computation. For example, deterministically doubling single photons solves the preparation and measuring problems, and a novel type of photon-photon interaction gives efficient quantum gates. This new quantum optics toolbox opened up by "coherent photon conversion" promises to lead to a nonlinear optical quantum computer.

First experiments

In a first series of experiments the group uses photons and highly non-linear glass fibers for a proof-of-principle demonstration of a process suitable for implementing the scheme. While deterministic operation has yet to be achieved, the authors' results suggest a line for development how this might be possible with sophisticated optical technologies, such as using highly nonlinear glasses and stronger lasers. Interestingly, the general idea of "coherent photon conversion" can also be applied to various other physical systems like atoms or nanomechanical devices.

This work was carried out as a joint effort by researchers of the Vienna Center for Quantum Science and Technology (VCQ) of the University of Vienna, the Institute for Quantum Optics and Quantum Information Vienna (IQOQI) of the Austrian Academy of Sciences, the National Institute of Informatics and the NTT Basic Research Laboratories (NTT Corporation) in Japan, as well as the Centre for Engineered Quantum Systems at the University of Queensland in Australia. It was supported by the European Research Council (Advanced Grant QIT4QAD), the Austrian Science Fund (grant F4007, an Erwin Schroedinger Fellowship, the Vienna Doctoral Program CoQuS FWF W121), the European Commission (QU-ESSENCE and QAP), the John Templeton Foundation and in part by the Japanese FIRST programme and the Ontario Ministry of Research and Innovation.


Story Source:

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


Journal Reference:

  1. N. K. Langford, S. Ramelow, R. Prevedel, W. J. Munro, G. J. Milburn, A. Zeilinger. Efficient quantum computing using coherent photon conversion. Nature, 2011; DOI: 10.1038/nature10463

Cite This Page:

University of Vienna. "New scheme for photonic quantum computing." ScienceDaily. ScienceDaily, 13 October 2011. <www.sciencedaily.com/releases/2011/10/111013135152.htm>.
University of Vienna. (2011, October 13). New scheme for photonic quantum computing. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2011/10/111013135152.htm
University of Vienna. "New scheme for photonic quantum computing." ScienceDaily. www.sciencedaily.com/releases/2011/10/111013135152.htm (accessed October 21, 2014).

Share This



More Computers & Math News

Tuesday, October 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Japanese Scientists Unveil Floating 3D Projection

Japanese Scientists Unveil Floating 3D Projection

Reuters - Innovations Video Online (Oct. 20, 2014) Scientists in Tokyo have demonstrated what they say is the world's first 3D projection that floats in mid air. A laser that fires a pulse up to a thousand times a second superheats molecules in the air, creating a spark which can be guided to certain points in the air to shape what the human eye perceives as an image. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Apple Enters Mobile Payment Business

Apple Enters Mobile Payment Business

AP (Oct. 20, 2014) Apple is making a strategic bet with the launch of Apple Pay, the mobile pay service aimed at turning your iPhone into your wallet. (Oct. 20) Video provided by AP
Powered by NewsLook.com
Google To Protect Against Piracy ... At A Cost

Google To Protect Against Piracy ... At A Cost

Newsy (Oct. 20, 2014) Google is changing its search-engine results to protect content producers from piracy — for a price. Video provided by Newsy
Powered by NewsLook.com
What We Know About Microsoft's Rumored Smartwatch

What We Know About Microsoft's Rumored Smartwatch

Newsy (Oct. 20, 2014) Microsoft will reportedly release a smartwatch that works across different mobile platforms, has a two-day battery life and tracks heart rate. 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