Featured Research

from universities, journals, and other organizations

Quantum Ghosts Are Helpful

Date:
May 3, 2009
Source:
University of Bristol
Summary:
Physicists have harnessed the phenomenon, "spooky action at a distance," to shed light on another unusual and previously difficult aspect of quantum physics -- that of distinguishing between two similar quantum devices.

The idea that far distant particles can somehow 'talk' to each other worried Einstein so much that he called it 'spooky action at a distance'.
Credit: Image courtesy of University of Bristol

The idea that far distant particles can somehow 'talk' to each other worried Einstein so much that he called it 'spooky action at a distance'.

Related Articles


Having confirmed its existence, scientists today are learning how to use this 'spooky action' as a helpful tool. Now a team of physicists at the University of Bristol and Imperial College London have harnessed this phenomenon to shed light on another unusual and previously difficult aspect of quantum physics - that of distinguishing between two similar quantum devices.

In the everyday world any process can be considered as a black box device with an input and an output; if you wish to identify the device you simply apply inputs, measure the outputs and determine what must have happened in between.

But quantum black boxes are different. Distinguishing between them is impossible using only single particle inputs because the outputs are not distinguishable: a fundamental consequence of the laws of quantum mechanics is that only very few states of a quantum particle can be reliably distinguished from one another.

The Bristol-Imperial team has shown how to get around this problem using 'spooky action'.

Anthony Laing, PhD student in the Department of Physics, who performed the study, said: "Apart from providing insight into the fundamentals of quantum physics, this work may be crucial for future quantum technologies.

"How else could a future quantum engineer build a quantum computer if they can't tell which circuits they have?"

The new findings have implications for our understanding of quantum mechanics as well as the emerging potential of quantum information science.

This work was performed in the Bristol Centre for Quantum Photonics led by Professor Jeremy O'Brien as part of a collaboration with Dr Terry Rudolph at Imperial College London.

The work was supported by the US Intelligence Advanced Research Projects Activity (IARPA), the UK Engineering and Physical Sciences Research Council (EPSRC), the UK Quantum Information Processing Interdisciplinary Collaboration (QIP IRC), and the Leverhulme Trust.


Story Source:

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


Journal Reference:

  1. Anthony Laing, Terry Rudolph, and Jeremy L. O'Brien. Experimental Quantum Process Discrimination. Phys. Rev. Lett., 102, 160502 (2009) DOI: 10.1103/PhysRevLett.102.160502

Cite This Page:

University of Bristol. "Quantum Ghosts Are Helpful." ScienceDaily. ScienceDaily, 3 May 2009. <www.sciencedaily.com/releases/2009/04/090427102229.htm>.
University of Bristol. (2009, May 3). Quantum Ghosts Are Helpful. ScienceDaily. Retrieved April 20, 2015 from www.sciencedaily.com/releases/2009/04/090427102229.htm
University of Bristol. "Quantum Ghosts Are Helpful." ScienceDaily. www.sciencedaily.com/releases/2009/04/090427102229.htm (accessed April 20, 2015).

Share This


More From ScienceDaily



More Computers & Math News

Monday, April 20, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Humanoid Robot Can Recognise and Interact With People

Humanoid Robot Can Recognise and Interact With People

Reuters - Innovations Video Online (Apr. 20, 2015) An ultra-realistic humanoid robot called &apos;Han&apos; recognises and interprets people&apos;s facial expressions and can even hold simple conversations. Developers Hanson Robotics hope androids like Han could have uses in hospitality and health care industries where face-to-face communication is vital. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Drones and Health Apps at Santiago's "Robotics Day"

Drones and Health Apps at Santiago's "Robotics Day"

AFP (Apr. 20, 2015) Latin American robotics experts gather in Santiago, Chile for "Robotics Day". Video provided by AFP
Powered by NewsLook.com
Japan Humanoid Robot Receives Customers at Department Store

Japan Humanoid Robot Receives Customers at Department Store

AFP (Apr. 20, 2015) She can smile, she can sing and she can give you guidance at one of the most upscale department stores in Tokyo...a female-looking humanoid makes her debut as a receptionist Video provided by AFP
Powered by NewsLook.com
Pending Comcast-Time Warner Merger Has DOJ, FCC Concerned

Pending Comcast-Time Warner Merger Has DOJ, FCC Concerned

Newsy (Apr. 20, 2015) The Department of Justice reportedly has concerns a Time Warner-Comcast merger would create an entity too large in the cable and broadband markets. 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