Subscribe free to our newsletters via your
. 24/7 Space News .




CHIP TECH
Atoms queue up for quantum computer networks
by Staff Writers
Copenhagen, Denmark (SPX) Jan 06, 2015


The experiment is carried out in a glass cell with very low pressure. In here is an ultra-thin glass fiber and a gas of cesium atoms. Using lasers and a magnetic field, the atoms are cooled down to almost absolute zero (minus 273 degrees Celsius) and the atoms gather as a cloud around the glass fiber. Then two laser beams with very different frequencies are transmitted into the fiber, thereby capturing atoms above the fiber surface. By measuring the difference in the speed of light for two other light beams on each side of the atoms' absorption line, you can measure the number of atoms. Image courtesy Ola Jakup Joensen, Niels Bohr Institute.

In order to develop future quantum computer networks, it is necessary to hold a known number of atoms and read them without them disappearing. To do this, researchers from the Niels Bohr Institute have developed a method with a trap that captures the atoms along an ultra thin glass fiber, where the atoms can be controlled. The results are published in the scientific journal, Physical Review Letters.

The research is carried out in the quantum optics laboratory in the basement of the Niels Bohr Institute in Copenhagen. The underground laboratory is set back from the road so there are no vibrations from traffic. Here, the researchers have designed experiments in which they can perform ultrasensitive trials with quantum optics.

"We have an ultra-thin glass fiber with a diameter of half a micrometer (a hundred times smaller than a strand of hair). Along this glass fiber we capture cesium atoms. They are cooled down to 100 micro Kelvin using a laser - this is almost absolute zero, which is equivalent to minus 273 degrees Celsius.

"This system acts like a trap that holds the atoms on the side of the glass fiber," explains Jurgen Appel, Associate Professor in the research group Quantop at the Niels Bohr Institute, University of Copenhagen.

Atoms and light linked together
When light is transmitted through the glass fiber thread, the light will also move along the surface because the fiber is thinner than wavelength of the light. This creates strong interaction between the light and the atoms sitting securely above the surface of the fiber.

"We have developed a method where we can measure the number of atoms. We send two laser beams with different frequencies through the glass fiber. If there were no atoms on the fiber, the speed of light would be the same for both light beams. However, the atoms affect the two frequencies differently and by measuring the difference in the speed of light for the two light beams on each side of the atoms' absorption lines, you can measure the number of atoms along the fiber. We have shown that we can hold 2,500 atoms with an uncertainty of just eight atoms," says Jurgen Appel.

These are fantastic results. Without this method, you would have to use resonant light (light that the atoms absorb) and then you would scatter photons, which would kick the atoms out of the trap, says Jurgen Appel and explains that with this new method they can measure and control the atoms so that only 14 percent are kicked out of the trap and are lost.

"Our resolution is only limited by the natural quantum noise (the laser light's own minimal fluctuations) so our method could be used for so-called entangled states of atoms along the fiber. Such an entangled system with strongly interacting atoms and light is of great interest for future quantum computer networks," notes Jurgen Appel.

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

.


Related Links
University of Copenhagen - Niels Bohr Institute
Computer Chip Architecture, Technology and Manufacture
Nano Technology News From SpaceMart.com






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





CHIP TECH
Piezoelectricity in a 2-D semiconductor
Berkeley CA (SPX) Dec 29, 2014
A door has been opened to low-power off/on switches in micro-electro-mechanical systems (MEMS) and nanoelectronic devices, as well as ultrasensitive bio-sensors, with the first observation of piezoelectricity in a free standing two-dimensional semiconductor by a team of researchers with the U.S. Department of Energy (DOE)'s Lawrence Berkeley National Laboratory (Berkeley Lab). Xiang Zhang, ... read more


CHIP TECH
Chinese spacecraft to return to moon's orbit

Russian Company Proposes to Build Lunar Base

'Shooting the Moon' with Satellite Laser Ranging

Moon Express testing compact lunar lander at Kennedy

CHIP TECH
Russian space medic who led Mars experiment dies at 64

Inflatable 'Donut' to Bring Astronauts to Mars

New analyses suggests water binds to sulfates in Martian soil

Isro's Mangalyaan Completes 100 Days in Mars Orbit

CHIP TECH
Global tech spending sputters amid economic woes

Electronics show a window into the 'Internet of Me'

NASA exploring inflatable spacecraft designs for future Mars missions

NASA Statement on GAO Decision to Deny Commercial Crew Contract Protest

CHIP TECH
China launches the FY-2 08 meteorological satellite successfully

China's Long March puts satellite in orbit on 200th launch

Countdown to China's new space programs begins

China develops new rocket for manned moon mission: media

CHIP TECH
Astronaut feels the force

Student Scientists Persevere, Ready to Launch Experiments to Space Station

ISS Crew to Raise Toasts for New Year's Eve 16 Times

The worst trip around the world

CHIP TECH
SpaceX aborts launch of Falcon 9 on landmark rocket test

Arianespace confident current and future launcher family will meet needs

Rocket glitch forces SpaceX to abort landmark launch

Elon Musk divorces actress wife Talulah Riley

CHIP TECH
Eight new planets found in 'Goldilocks' zone

Gemini Planet Imager produces stunning observations in its first year

Volunteer 'Disk Detectives' Classify Possible Planetary Habitats

Kepler Marks 1,000th Exoplanet Discovery

CHIP TECH
Electromagnetic waves linked to particle fallout in Earth's atmosphere

A repulsive material

Freshmen-level chemistry solves the solubility mystery of graphene oxide films

South Korean Satellite Faces Collision With Space Junk: Reports




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.