Featured Research

from universities, journals, and other organizations

What if quantum physics worked on a macroscopic level? Researchers have successfully entangled optic fibers populated by 500 photons

Date:
July 25, 2013
Source:
Université de Genève
Summary:
Quantum physics concerns a world of infinitely small things. But for years, researchers have been attempting to observe the properties of quantum physics on a larger scale, even macroscopic.

Quantum physics concerns a world of infinitely small things. But for years, researchers from the University of Geneva (UNIGE), Switzerland, have been attempting to observe the properties of quantum physics on a larger scale, even macroscopic. In January 2011, they managed to entangle crystals, therefore surpassing the atomic dimension. Now, Professor Nicolas Gisin's team has successfully entangled two optic fibers, populated by 500 photons.

Related Articles


Unlike previous experiments which were carried out with the fiber optics of one photon, this new feat (which has been published in Nature Physics) begins to answer a fundamental question: can quantum properties survive on a macroscopic level?

For thirty years, physicists have been able to entangle photon pairs (particles of light). Thus, an action on the first particle will have an instant impact on the second, regardless of the distance and the obstacles between them. It occurs as if it were one single photon present at two different places. With this feat in mind, one question remains: can larger elements be entangled on a macroscopic level?

It would seem intuitive to think that the rules of physics that apply at the atomic level would be transferable to the macroscopic world. However, attempts to prove this have not been easy. In fact, when the size of a quantum system increases, it interacts more and more with its surrounding environment, which rapidly destroys its quantum properties. This phenomenon, known as quantum decoherence, is one of the limitations on the capability of macroscopic systems to retain their quantum properties.

From micro to macroscopic

Despite these limitations, and due to technological advances, scientists from UNIGE's Faculty of Science were able to entangle two fiber optics populated by 500 photons, unlike those that were previously entangled to only one photon.

To do this, the team led by Nicolas Gisin, professor in the Physics Section, created an entanglement between two fiber optics on a microscopic level before moving it to the macroscopic level. The entangled state survived the transition to a larger-scale world and the phenomenon could even be observed with the traditional means of detection, i.e. practically with the naked eye.

In order to verify that the entanglement survived in the macroscopic world, the physicists reconverted the phenomenon at the microscopic level.

"This first large-scale experiment paves the way for many applications that quantum physics offers. The entanglement at the macroscopic level is one of the main research areas in the field, and we hope to entangle increasingly large objects in the years to come," said Professor Gisin.


Story Source:

The above story is based on materials provided by Université de Genève. Note: Materials may be edited for content and length.


Journal Reference:

  1. N. Bruno, A. Martin, P. Sekatski, N. Sangouard, R. T. Thew, N. Gisin. Displacement of entanglement back and forth between the micro and macro domains. Nature Physics, 2013; DOI: 10.1038/nphys2681

Cite This Page:

Université de Genève. "What if quantum physics worked on a macroscopic level? Researchers have successfully entangled optic fibers populated by 500 photons." ScienceDaily. ScienceDaily, 25 July 2013. <www.sciencedaily.com/releases/2013/07/130725104851.htm>.
Université de Genève. (2013, July 25). What if quantum physics worked on a macroscopic level? Researchers have successfully entangled optic fibers populated by 500 photons. ScienceDaily. Retrieved March 1, 2015 from www.sciencedaily.com/releases/2013/07/130725104851.htm
Université de Genève. "What if quantum physics worked on a macroscopic level? Researchers have successfully entangled optic fibers populated by 500 photons." ScienceDaily. www.sciencedaily.com/releases/2013/07/130725104851.htm (accessed March 1, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Sunday, March 1, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Elon Musk's Hyperloop Moves Forward

Elon Musk's Hyperloop Moves Forward

Buzz60 (Feb. 27, 2015) — Zipping around at 800-miles an hour is coming closer to reality in California. An entire town is being built around Elon Musk&apos;s Hyperloop concept and it wants you to stop in for a ride when it&apos;s ready. Brett Larson is on board. Video provided by Buzz60
Powered by NewsLook.com
Vibrating Bicycle Senses Traffic

Vibrating Bicycle Senses Traffic

Reuters - Innovations Video Online (Feb. 26, 2015) — Dutch scientists have developed a smart bicycle that uses sensors, wireless technology and video to warn riders of traffic dangers. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com
In Japan, Robot Dogs Are for Life -- And Death

In Japan, Robot Dogs Are for Life -- And Death

AFP (Feb. 25, 2015) — Robot dogs are the perfect pet for some in Japan who go to repairmen-turned-vets when their pooch breaks down - while a full Buddhist funeral ceremony awaits those who don&apos;t make it. Duration: 02:40 Video provided by AFP
Powered by NewsLook.com
London Show Dissects History of Forensic Science

London Show Dissects History of Forensic Science

AFP (Feb. 25, 2015) — Forensic science, which has fascinated generations with its unravelling of gruesome crime mysteries, is being put under the microscope in an exhibition of real criminal investigations in London. Duration: 00:53 Video provided by AFP
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