Featured Research

from universities, journals, and other organizations

Researchers explore quantum entanglement

Date:
February 8, 2013
Source:
University of Calgary
Summary:
Researchers propose a way in which "spooky action at a distance" can be shown experimentally.

Albert Einstein called quantum entanglement -- two particles in different locations, even on other sides of the universe, influencing each other -- "spooky action at a distance."

Related Articles


Einstein made the comment while criticizing quantum mechanics as incomplete -- the phenomenon of quantum entanglement seems to be at odds with Einstein's theory of relativity.

"Eighty years after Einstein, quantum physics is still so mysterious that there are many different interpretations of its physical meaning. All the interpretations agree on what is going to be observed in any given experiment, but they each tell different stories of how these observations come about," says Christoph Simon with the Department of Physics and Astronomy in the Faculty of Science at the University of Calgary.

Simon and his colleague, Boris Braverman from the Massachusetts Institute of Technology have shown this spooky action at a distance in research published February 8 in Physical Review Letters. The paper proposes a way in which the effect can be shown experimentally.

"We consider spooky action at a distance in the framework of an interpretation from the English physicist David Bohm who posited that every quantum particle has a well-defined position and velocity," says Simon.

"If the two particles are entangled, then performing an action on one has an immediate effect on the other and our paper shows how this effect can be demonstrated in an experiment with entangled photons."

Entangled photons present an exciting new method of secure communications -- it's impossible for people to listen in. But this phenomenon can't be used for communication faster than the speed of light (what physicists call superluminal), allowing quantum physical systems to obey Einstein's theory of relativity, which posits that things can't communicate faster than light.

There is either no explanation for this -- it's magic and somehow there are the same outcomes on each side -- or the communication between photons is superluminal, which is problematic given the theory of relativity. "There has to be a way out," says Simon.

"Different pairs of particles coming from the same source have slightly different positions and velocities," he says. "If you observe just one of the two particles from a pair, you can't be sure if a variation in its velocity, say, is due to the long-distance influence of its partner, or whether it is just a statistical fluctuation. In this way the peaceful coexistence of quantum physics and relativity is preserved."


Story Source:

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


Journal Reference:

  1. Boris Braverman, and Christoph Simon. Proposal to Observe the Nonlocality of Bohmian Trajectories with Entangled Photons. Physical Review Letters, 2013 DOI: 10.1103/PhysRevLett.110.060406

Cite This Page:

University of Calgary. "Researchers explore quantum entanglement." ScienceDaily. ScienceDaily, 8 February 2013. <www.sciencedaily.com/releases/2013/02/130208110253.htm>.
University of Calgary. (2013, February 8). Researchers explore quantum entanglement. ScienceDaily. Retrieved November 21, 2014 from www.sciencedaily.com/releases/2013/02/130208110253.htm
University of Calgary. "Researchers explore quantum entanglement." ScienceDaily. www.sciencedaily.com/releases/2013/02/130208110253.htm (accessed November 21, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Friday, November 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

AFP (Nov. 21, 2014) Toyota presented its hydrogen fuel-cell compact car called "Mirai" to US consumers at the Los Angeles auto show. The car should go on sale in 2015 for around $60.000. It combines stored hydrogen with oxygen to generate its own power. Duration: 01:18 Video provided by AFP
Powered by NewsLook.com
Google Announces Improvements To Balloon-Borne Wi-Fi Project

Google Announces Improvements To Balloon-Borne Wi-Fi Project

Newsy (Nov. 21, 2014) In a blog post, Google said its balloons have traveled 3 million kilometers since the start of Project Loon. Video provided by Newsy
Powered by NewsLook.com
NSA Director: China Can Damage US Power Grid

NSA Director: China Can Damage US Power Grid

AP (Nov. 20, 2014) China and "one or two" other countries are capable of mounting cyberattacks that would shut down the electric grid and other critical systems in parts of the United States, according to Adm. Michael Rogers, director of the National Security Agency and hea Video provided by AP
Powered by NewsLook.com
Latest Minivan Crash Tests Aren't Pretty

Latest Minivan Crash Tests Aren't Pretty

Newsy (Nov. 20, 2014) Five minivans were put to the test in head-on crash simulations by the Insurance Institute for Highway Safety. 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