Featured Research

from universities, journals, and other organizations

Scientists create 'building block' of quantum networks

Date:
February 8, 2013
Source:
Institute of Physics (IOP)
Summary:
A proof-of-concept device that could pave the way for on-chip optical quantum networks has been created by a group of researchers. The device has been described as the "building block of future quantum networks."

Artist's illustration. Researchers have created a proof-of-concept device that could pave the way for on-chip optical quantum networks.
Credit: Anterovium / Fotolia

A proof-of-concept device that could pave the way for on-chip optical quantum networks has been created by a group of researchers from the US.

Related Articles


Presenting the device February 8, in the Institute of Physics and German Physical Society's New Journal of Physics, it has been described as the "building block of future quantum networks."

In an optical quantum network, information is carried between points by photons -- the basic unit of light. There is a huge potential for this type of network in the field of quantum computing and could enable computers that are millions of times faster at solving certain problems than what we are used to today.

This new device, which combines a single nitrogen-vacancy centre in diamond with an optical resonator and an optical waveguide, could potentially become the memory or the processing element of such a network.

A nitrogen-vacancy centre is a defect in the lattice structure of diamond where one of the carbon atoms is replaced by a nitrogen atom and the nearest neighbour carbon atom is missing. The nitrogen-vacancy centre has the property of photoluminescence, whereby a substance absorbs photons from a source and then subsequently emits photons.

The emitted photons are special in that they are correlated, or entangled, with the nitrogen-vacancy centre that they came from, which as the researchers state is crucial for future experiments that will look to examine this correlation. You cannot get these correlated photons from a normal light source.

In this device, the photons are produced from a nitrogen-vacancy centre within a diamond microring resonator. The nitrogen-vacancy centre is located inside the diamond resonator as it is more likely to emit photons than when it is located in the waveguide or just in plain diamond. Moreover, the photons emitted in the resonator are easier to couple into an on-chip waveguide.

The cotton bud-shaped waveguide sends the photons out into a desired direction through gratings at either end.

"One of the holy grails in quantum photonics is to develop networks where optical quantum emitters are interconnected via photons," said lead author of the study Andrei Faraon.

"In this work we take the first step and demonstrate that photons -- the information carriers -- from a single nitrogen-vacancy centre can be coupled to an optical resonator and then further coupled to a photonic waveguide. We hope that multiple devices of this kind will be interconnected in a photonic network on a chip."

The study, undertaken by researchers from the California Institute of Technology, Hewlett Packard Laboratories and University of Washington, tested the device by cooling it to temperatures below 10K and shining a green laser onto the nitrogen vacancy to evoke photoluminescence.

The entire device was etched in a diamond membrane that was around 300 nanometres thick.

"The whole idea of these devices is that they are able to be produced en masse. So far the procedure for mass fabrication is still at the proof-of-concept level, so there is still plenty of work to be done to make it reliable," continued Professor Faraon.


Story Source:

The above story is based on materials provided by Institute of Physics (IOP). Note: Materials may be edited for content and length.


Journal Reference:

  1. Andrei Faraon, Charles Santori, Zhihong Huang, Kai-Mei C Fu, Victor M Acosta, David Fattal, Raymond G Beausoleil. Quantum photonic devices in single-crystal diamond. New Journal of Physics, 2013; 15 (2): 025010 DOI: 10.1088/1367-2630/15/2/025010

Cite This Page:

Institute of Physics (IOP). "Scientists create 'building block' of quantum networks." ScienceDaily. ScienceDaily, 8 February 2013. <www.sciencedaily.com/releases/2013/02/130207192116.htm>.
Institute of Physics (IOP). (2013, February 8). Scientists create 'building block' of quantum networks. ScienceDaily. Retrieved November 22, 2014 from www.sciencedaily.com/releases/2013/02/130207192116.htm
Institute of Physics (IOP). "Scientists create 'building block' of quantum networks." ScienceDaily. www.sciencedaily.com/releases/2013/02/130207192116.htm (accessed November 22, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Saturday, November 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

AFP (Nov. 21, 2014) Toyota presented its hydrogen fuel-cell compact car called "Mirai" to US consumers at the Los Angeles auto show. The car should go on sale in 2015 for around $60.000. It combines stored hydrogen with oxygen to generate its own power. Duration: 01:18 Video provided by AFP
Powered by NewsLook.com
Google Announces Improvements To Balloon-Borne Wi-Fi Project

Google Announces Improvements To Balloon-Borne Wi-Fi Project

Newsy (Nov. 21, 2014) In a blog post, Google said its balloons have traveled 3 million kilometers since the start of Project Loon. Video provided by Newsy
Powered by NewsLook.com
NSA Director: China Can Damage US Power Grid

NSA Director: China Can Damage US Power Grid

AP (Nov. 20, 2014) China and "one or two" other countries are capable of mounting cyberattacks that would shut down the electric grid and other critical systems in parts of the United States, according to Adm. Michael Rogers, director of the National Security Agency and hea Video provided by AP
Powered by NewsLook.com
Latest Minivan Crash Tests Aren't Pretty

Latest Minivan Crash Tests Aren't Pretty

Newsy (Nov. 20, 2014) Five minivans were put to the test in head-on crash simulations by the Insurance Institute for Highway Safety. 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