Home  |  Top News  |  Most Popular  |  Video  |  Multimedia  |  News Feeds  |  Feedback
  Medicine  |  Nature & Earth  |  Biology  |  Technology & Engineering  |  Space & Planetary  |  Psychology  |  Physics & Chemistry  |  Economics  |  Archaeology
Top > Technology & Engineering > Researchers Gain Information Advantage from… >
Researchers Gain Information Advantage from Surprising Quantum Source

Published: August 6, 2012.
By Centre for Quantum Technologies at the National University of Singapore
http://www.quantumlah.org

New research lends hope that a phenomenon called quantum discord could be harnessed to bring quantum technologies within easier reach than expected. The work, by an international team, is published 5 August in Nature Physics.

Researcher Helen Chrzanowski operates an experiment at the Australian National University that unlocks quantum discord in pairs of laser beams. Credit: The Australian National University

Up until a few years ago, researchers thought that realising quantum technologies would mean harnessing the most difficult-to-tame properties of the quantum world. For example, 'entanglement', the phenomenon referred to by Einstein as spooky-action-at-a-distance, was thought to be a resource required to run a quantum computer. This presents a challenge. In a laboratory setting, entanglement can be protected with near ideal conditions. Outside the lab, however, entanglement is fragile and transient.

But now researchers realise that entanglement may not always be necessary. In the past few years, scientists have discovered examples of technologies that seem to gain a quantum advantage without entanglement. Researchers are left with the question, where does the quantum power come from?

The new research by the National University of Singapore (NUS), The Australian National University (ANU), the University of Queensland and the University of Oxford identifies that quantum discord, a more robust and easy to access phenomenon than entanglement, can also deliver a quantum advantage.

The team in Singapore discovered a direct link between quantum power and quantum discord. "We've shown that quantum discord is a resource that we can tap with the right quantum tools," said Mile Gu, a Research Fellow of the Centre for Quantum Technologies at NUS.

The ANU team encoded information onto laser light to demonstrate the unlocking of this quantum resource. In their experiment, they show that they can retrieve more information by using quantum discord than if the discord is not accessed.

Ping Koy Lam, Professor at ANU, said "The experiment is analogous to decoding music from a AM/FM radio simulcast that is badly affected by static."

They found that discord is similar to shared quantum static and that more 'music' can be extracted from this simulcast with the right quantum tools. Quantum discord has been shown to be present in many systems, and might previously have been characterised as unwanted noise. This has made some scientists sceptical that it could be useful. The new results suggest otherwise. The experiment demonstrated isn't considered a quantum computation, but it shows that discord has potential that can be unlocked for quantum technologies.

Researchers are now looking for other tasks that may be enhanced by quantum discord. The hope is that discord could prove an easier path to future quantum technologies than entanglement. With a scientist's caution, Lam said "Our work hints towards the possibility that the requirements on certain quantum technologies could be relaxed."


Show Reference »


Translate this page: Chinese French German Italian Japanese Korean Portuguese Russian Spanish


 
All comments are reviewed before being posted. We cannot accept messages that refer a product, or web site.If you are looking for a response to a question please use our another feedback page.
Related »

Quantum 
9/30/13 
★★ 

Quantum Computers: Trust Is Good, Proof Is Better
By University of Vienna
Information 
9/1/11 

UCSB Physicists Demonstrate the Quantum Von Neumann Architecture
By University of California - Santa Barbara
Quantum 
9/23/13 

UCSB Researchers Make Headway in Quantum Information Transfer Via Nanomechanical Coupling
By University of California - Santa Barbara
Quantum 
1/20/12 
★★ 
Quantum Physics Enables Perfectly Secure Cloud Computing
By University of Vienna
Researchers have succeeded in combining the power of quantum computing with the security of quantum cryptography and have shown that perfectly secure cloud computing can be achieved using the …
Computing 
8/7/14 
★★★ 

Diamonds Are a Quantum Computer's Best Friend
By Vienna University of Technology
Atom 
5/1/13 

Best of Both Worlds: Towards a Quantum Internet with Combined Optical And Electrical Technique
By University of New South Wales
Quantum 
7/23/14 

Scientists Find Way to Maintain Quantum Entanglement in Amplified Signals
By Moscow Institute of Physics and Technology
Quantum 
8/2/11 
Dramatic Simplification Paves the Way for Building a Quantum Computer
By University of Bristol
Dr Xiao-Qi Zhou and colleagues at the University of Bristol's Centre for Quantum Photonics and the University of Queensland, Australia, have shown that controlled operations — ones that are …
Wineland 
4/14/14 

Quantum Manipulation: Filling the Gap Between Quantum And Classical World
By Science China Press
Photon 
2/4/13 
Into the Quantum Internet at the Speed of Light
By University of Innsbruck
Thanks to the strange laws of quantum mechanics, quantum computers would be able to carry out certain computational tasks much faster than conventional computers. Among the most promising technologies …
Information 
6/7/10 
A Study Lays the Foundations for Tomographics Applied to the Quantum World
By Carlos III University of Madrid
Any physical system - be it an electron, a molecule of water, a virus, a human being, a whole planet – is characterized at each moment in time distinctively …
Quantum 
1/30/14 
Integration Brings Quantum Computer a Step Closer
By University of Bristol
An international research group led by the University of Bristol has made an important advance towards a quantum computer by shrinking down key components and integrating them onto a …
Quantum 
4/17/13 

A New Twist for Quantum Systems
By ETH Zurich
More » 
 
© Newsline Group  |  About  |  Privacy Policy  |  Feedback  |  Mobile  |  Japanese Edition
All contents are copyright of their owners except U.S. Government works. U.S. Government works are assumed to be in the public domain unless otherwise noted. Everything else copyright ScienceNewsline.