Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



TIME AND SPACE
Theoretical physicists are modeling complex quantum processes with cold atoms and ions
by Staff Writers
Moscow, Russia (SPX) Nov 09, 2017


File image

A group of researchers from Russia, Germany and Iran develops computational methods for creating a theory describing the behavior of cold atoms and ions in optical and electromagnetic traps. There is a high demand for these works due to the possibility of modeling with such completely controlled quantum systems of complex processes, from solid-state physics to high-energy physics.

The projects on designing elements of a quantum computer and ultra-precise atomic clock based on trapped ultracold atoms and ions are being discussed. The results of the latest studies of the group were presented at the conference Grid, Cloud and High-Performance Computing in Science (Sinaia, Romania). The work was published in Physical Review E.

At ultralow temperatures (for alkali metal atoms they reach values of several nK), atoms move at a very low speed, which allows conducting high-precision experiments. However, to interpret and plan the experiments, theoretical calculations are required. Vladimir Melezhik, Doctor of Physical and Mathematical Sciences from RUDN University, is engaged in calculations of resonant phenomena and collision processes in ultracold quantum gases.

Quantum gas is retained at ultralow temperatures in an optical trap formed by a specially tuned laser beams. The developed experimental technique makes it possible to control and tune the parameters of such quantum systems: the number of particles, their spin composition, temperature, and, last but not least, the effective interaction between atoms. However, the task of quantitative description of the processes occurring is significantly complicated by the fact that in such systems the atoms interact not only with each other but also with the trap.

Vladimir Melezhik and his co-authors focus on atomic and ion traps, which have the shape of highly elongated cigars and are similar to waveguides used for transmission of electromagnetic waves. The researchers have been studying the propagation of electromagnetic radiation in waveguides for a long time, and effective methods of calculation have been developed. However, a quantitative theory that could describe ultracold processes in atomic and ion waveguides is still under development.

"The trap adds a complexity to the problem. In free space, there are no preferred directions. This circumstance makes it possible to reduce the six-dimensional quantum two-body problem of two colliding atoms to a one-dimensional one. This is the key problem of quantum mechanics, described in textbooks.

However, in the atomic trap, due to appearance of a preferred direction, the symmetry is violated which makes it impossible to reduce the problem to one-dimensional one. In certain cases the problem can be reduced to the two-dimensional Schrodinger equation.

However, in most interesting cases it becomes necessary to integrate the Schrodinger equation in higher dimensions. To solve this class of problems, one needs to develop special computational methods and use powerful computers. We managed to make significant progress on this pass", the author of the report Vladimir Melezhik said.

By changing the parameters of the trap, one can control the intensity of effective interatomic interactions, from superstrong attraction to superstrong repulsion of atoms. This fact makes it possible to simulate various critical quantum phenomena using ultracold trapped atoms.

"One of the areas of our work is a numerical study of ultracold quantum systems using hybrid atomic-ion traps, offering new possibilities for modeling some actual processes of solid state physics, elements of quantum computing and precision physics research", the scientist concluded.

Research paper

TIME AND SPACE
Where did those electrons go? X-ray measurements solve decades-old mystery
Ithaca NY (SPX) Nov 08, 2017
The concept of "valence" - the ability of a particular atom to combine with other atoms by exchanging electrons - is one of the cornerstones of modern chemistry and solid-state physics. Valence controls crucial properties of molecules and materials, including their bonding, crystal structure, and electronic and magnetic properties. Four decades ago, a class of materials called "mixed ... read more

Related Links
RUDN University
Understanding Time and Space


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

Comment using your Disqus, Facebook, Google or Twitter login.

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

TIME AND SPACE
NASA Completes Review of First SLS, Orion Deep Space Exploration Mission

Stressed seedlings in space

Orbital ATK's to deliver supplies to International Space Station

How Does Your Space Garden Grow

TIME AND SPACE
Vega launches Earth observation satellite for Morocco

Orbital ATK Successfully Tests First Motor Case for Next Generation Launch Vehicle

Russia embezzlement probe at rocket firm Soyuz

Alaska Aerospace Launches Aurora Launch Services Company

TIME AND SPACE
How long can microorganisms live on Mars

NASA Opens $2 Million Third Phase of 3D-Printed Habitat Competition

Insight will carry over two million names to Mars

Opportunity Does a Wheelie and is Back on Solid Footing

TIME AND SPACE
China's reusable spacecraft to be launched in 2020

Space will see Communist loyalty: Chinese astronaut

China launches three satellites

Mars probe to carry 13 types of payload on 2020 mission

TIME AND SPACE
European Space Week starts in Estonia

New Chinese sat comms company awaits approval

Myanmar to launch own satellite system-2 in 2019: vice president

Eutelsat's Airbus-built full electric EUTELSAT 172B satellite reaches geostationary orbit

TIME AND SPACE
Cancer cells destroyed with dinosaur extinction metal

General Atomics awarded $8.8M contract for low power laser demonstrator

Cheyenne Mountain sees better satellite picture

Tech increases microfluidic research data output 100-fold

TIME AND SPACE
Scientists find potential 'missing link' in chemistry that led to life on earth

18-Month Twinkle in a Forming Star Suggests a Very Young Planet

Overlooked Treasure: The First Evidence of Exoplanets

Atmospheric beacons guide NASA scientists in search for life

TIME AND SPACE
Watching Jupiter's multiple pulsating X-ray Aurora

Help Nickname New Horizons' Next Flyby Target

Juno Aces 8th Science Pass of Jupiter, Names New Project Manager

Jupiter's X-ray auroras pulse independently




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






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - 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. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. 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