Featured Research

from universities, journals, and other organizations

Femtosecond, Chirped Laser Pulse Trains Could Reduce Decoherence

Date:
November 12, 2008
Source:
Stevens Institute of Technology
Summary:
A physics professor is proposing to use femtosecond, chirped laser pulse trains to reduce decoherence. Controlling coherence can overcome current barriers in a variety of fields, from quantum computing to molecular selective bio-imaging.

In a recent publication in the high impact journal Optics Letters, Svetlana Malinovskaya, Associate Professor of Physics at Stevens Institute of Technology, proposes to use femtosecond, chirped laser pulse trains to reduce decoherence. Controlling coherence can overcome current barriers in a variety of fields, from quantum computing to molecular selective bio-imaging.

Coherence is a natural phenomenon where molecules exist in a superposition of states. "In condensed phase, molecules interact with environment, for example, with water molecules. This interaction increases complexity of the energy distribution causing molecules to lose their quantum properties, such as coherence, faster than in the gas phase," Malinovskaya explained. "Loss of coherence is a problem in Raman microscopy, which is a prospective method for molecular identification and imaging. The molecules that are excited with a laser pulse lose their energy very fast. Sometimes this energy loss is on the same scale as the pulse duration, which negatively influences the Raman signal identifying the molecules."

In her recent publication in Optics Letters, "Prevention of decoherence by two femtosecond chirped pulse trains" (Vol. 33, Issue 19), Malinovskaya describes a method to counteract decoherence by using femtosecond chirped pulse trains. The key is to make the period of the pulse trains equal to the relaxation time of the vibrational energy of the target molecules. This way, you can selectively prepare the target molecules in the excited state and restore coherence periodically.

Recently, femtosecond pulse trains emitted from a mode-locked laser have been utilized to form the basis of the frequency comb spectroscopy. For contributions to the development of laser-based precision spectroscopy, including the optical frequency comb technique, the 2005 Nobel Prize was awarded in physics to John Hall, Theodor Hδnsch and Roy Glauber. "Soon after, physicists have started to use pulse trains as a new way to control light and matter," Malinovsksya said. "Using the modulated laser pulse trains, we aim to affect predetermined properties of molecules. In addition to other achievements, we can now selectively address molecular vibrations of known frequency and optimize the Raman signal from them in the presence of decoherence."

One of the key applications of the pulse train manipulation lies in the biological imaging. Malinovskaya explained: "In order to get an image of a molecular specific structure one has to program the laser pulses to excite vibrations only in the predetermined molecular groups constituting target bio-compounds. No other methods allow one to see the difference in the structure built of, for example, saturated or unsaturated fats."

Malinovskaya performs her research within the Center for Control of Quantum Systems, which aims to engineer the quantum world, and manipulate nature at the quantum level. Together with another faculty member, Ting Yu, she studies applications in quantum computing and quantum information processing where coherence control is currently one of most challenging issues.


Story Source:

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


Journal Reference:

  1. Svetlana A. Malinovskaya. Prevention of decoherence by two femtosecond chirped pulse trains. Optics Letters, 2008; 33 (19): 2245-2247 DOI: 10.1364/OL.33.002245

Cite This Page:

Stevens Institute of Technology. "Femtosecond, Chirped Laser Pulse Trains Could Reduce Decoherence." ScienceDaily. ScienceDaily, 12 November 2008. <www.sciencedaily.com/releases/2008/11/081110171346.htm>.
Stevens Institute of Technology. (2008, November 12). Femtosecond, Chirped Laser Pulse Trains Could Reduce Decoherence. ScienceDaily. Retrieved October 23, 2014 from www.sciencedaily.com/releases/2008/11/081110171346.htm
Stevens Institute of Technology. "Femtosecond, Chirped Laser Pulse Trains Could Reduce Decoherence." ScienceDaily. www.sciencedaily.com/releases/2008/11/081110171346.htm (accessed October 23, 2014).

Share This



More Matter & Energy News

Thursday, October 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

3D Printed Instruments Make Sweet Music in Sweden

3D Printed Instruments Make Sweet Music in Sweden

Reuters - Innovations Video Online (Oct. 23, 2014) — Students from Lund University's Malmo Academy of Music are believed to be the world's first band to all use 3D printed instruments. The guitar, bass guitar, keyboard and drums were built by Olaf Diegel, professor of product development, who says 3D printing allows musicians to design an instrument to their exact specifications. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Chameleon Camouflage to Give Tanks Cloaking Capabilities

Chameleon Camouflage to Give Tanks Cloaking Capabilities

Reuters - Innovations Video Online (Oct. 22, 2014) — Inspired by the way a chameleon changes its colour to disguise itself; scientists in Poland want to replace traditional camouflage paint with thousands of electrochromic plates that will continuously change colour to blend with its surroundings. The first PL-01 concept tank prototype will be tested within a few years, with scientists predicting that a similar technology could even be woven into the fabric of a soldiers' clothing making them virtually invisible to the naked eye. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Jet Sales Lift Boeing Profit 18 Pct.

Jet Sales Lift Boeing Profit 18 Pct.

Reuters - Business Video Online (Oct. 22, 2014) — Strong jet demand has pushed Boeing to raise its profit forecast for the third time, but analysts were disappointed by its small cash flow. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Internet of Things Aims to Smarten Your Life

Internet of Things Aims to Smarten Your Life

AP (Oct. 22, 2014) — As more and more Bluetooth-enabled devices are reaching consumers, developers are busy connecting them together as part of the Internet of Things. (Oct. 22) Video provided by AP
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