Featured Research

from universities, journals, and other organizations

New Method For Quantum Cooling Discovered

Date:
August 9, 2005
Source:
University of Texas at Austin
Summary:
Physicists at The University of Texas at Austin have discovered a new technique for cooling atoms and molecules that will allow them to study quantum physics more effectively with a greater variety of particles. The researchers have found a way to use lasers to form walls that allow atoms and molecules to pass through in one direction, but do not allow them to return.

AUSTIN, Texas—Physicists at The University of Texas atAustin have discovered a new technique for cooling atoms and moleculesthat will allow them to study quantum physics more effectively with agreater variety of particles.

The researchers have found a way touse lasers to form walls that allow atoms and molecules to pass throughin one direction, but do not allow them to return.

The technique could lead to advances in atomic clocks, which are used to standardize time worldwide.

Dr.Mark Raizen of the Center for Nonlinear Dynamics and his colleaguesdescribe the one-way wall technique in Physical Review Letters andEurophysics Letters published earlier this year.

Raizen and hiscolleagues show that atoms and molecules can first be trapped in a boxwhose walls are built of laser light. The box can then be separatedwith an optical wall constructed of two lasers. These two lasers workin concert to allow atoms and molecules to pass through to one side ofthe box but block them from getting back to the other side. The boxthen has two distinct spaces, one filled with particles and one void ofparticles.

Raizen’s one-way wall extends the capabilities oflaser and evaporative cooling, which have been limited to cooling asmall number of atoms in the periodic table. The new method isapplicable to a greater diversity of atoms and molecules and can expandthe capability of researchers to test laws of quantum physics atextremely low temperatures.

“In nature, the cell wall is the classic example where atoms and molecules move through a one-way barrier,” Raizen said.

Cellsregulate the flow of ions through one-way channels in order to createosmotic pressure. Raizen and his colleagues illustrate it is possibleto create a manmade barrier to such atomic movement.

“The beauty of the one-way atomic wall,” Raizen said, “is that there is almost no increase in kinetic energy.”

Withno increase in kinetic energy comes no increase in heat. By expandingand contracting the space that holds the trapped atoms and molecules,the temperature of this space, which Raizen calls a “quantumrefrigerator,” can be lowered until it reaches very close to AbsoluteZero.

It’s at these ultra cold temperatures, -459 degrees Fahrenheit, that quantum physicists can manipulate atoms and molecules.


Story Source:

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


Cite This Page:

University of Texas at Austin. "New Method For Quantum Cooling Discovered." ScienceDaily. ScienceDaily, 9 August 2005. <www.sciencedaily.com/releases/2005/08/050809064837.htm>.
University of Texas at Austin. (2005, August 9). New Method For Quantum Cooling Discovered. ScienceDaily. Retrieved October 1, 2014 from www.sciencedaily.com/releases/2005/08/050809064837.htm
University of Texas at Austin. "New Method For Quantum Cooling Discovered." ScienceDaily. www.sciencedaily.com/releases/2005/08/050809064837.htm (accessed October 1, 2014).

Share This



More Matter & Energy News

Wednesday, October 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Argentina's Tax Evaders Detected, Hunted Down by Drones

Argentina's Tax Evaders Detected, Hunted Down by Drones

AFP (Sep. 30, 2014) Argentina doesn't only have Lionel Messi the footballer, it has now also acquired "Mesi" the drone system which monitors undeclared mansions, swimming pools and soy fields to curb tax evasion in the country. Duration: 01:18 Video provided by AFP
Powered by NewsLook.com
Do Video Games Trump Brain Training For Cognitive Boosts?

Do Video Games Trump Brain Training For Cognitive Boosts?

Newsy (Sep. 29, 2014) More and more studies are showing positive benefits to playing video games, but the jury is still out on brain training programs. Video provided by Newsy
Powered by NewsLook.com
CERN Celebrates 60 Years of Science

CERN Celebrates 60 Years of Science

Reuters - Business Video Online (Sep. 29, 2014) CERN, the European Organisation for Nuclear Research, celebrates 60 years of bringing nations together through science. As Joanna Partridge reports from inside the famous science centre it's also planning to turn the Large Hadron Collider particle accelerator back on after an upgrade. Video provided by Reuters
Powered by NewsLook.com
This 'Invisibility Cloak' Is Simpler Than Most

This 'Invisibility Cloak' Is Simpler Than Most

Newsy (Sep. 28, 2014) Researchers from the University of Rochester have created a type of invisibility cloak with simple focal lenses. 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