Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Quantum copies do new tricks

23.03.2012
One of the strange features of quantum information is that, unlike almost every other type of information, it cannot be perfectly copied.

For example, it is impossible to take a single photon and make a number of photons that are in the exact same quantum state. This may seem minor, but it's not. If perfect copying was possible, it would, among other things, be possible to send signals faster than the speed of light. This is forbidden by Einstein's theory of relativity.

For years, scientists have been experimenting with the idea of approximate quantum copying. A recent paper published in Physical Review Letters (PRL), by Sadegh Raeisi, Dr. Wolfgang Tittel and Dr. Christoph Simon of the Institute for Quantum Information Science at the University of Calgary takes another step in that research.

They showed that it is possible to perfectly recover the original from the imperfect quantum copies. They also proposed a way that his could be done in practice.

"Copying classical information is very important in our daily lives," says paper co-author Simon. "Think of the prevalence of photocopiers, faxes, scanners. It was quite surprising for physicists when they realized that the same thing is not possible for quantum systems, at least not perfectly. It is then important to study what exactly is possible and what isn't."

The research can be used in a variety of ways. First, it shows clearly that quantum information is preserved when copied. Even though the copies may be imperfect, the original quantum state can be recovered. In practical terms, it might lead to a precision measurement technique based on quantum physics for samples that have very low contrast, such as living cells.

The Institute for Quantum Information Science is a multidisciplinary group of researchers from the areas of computer science, mathematics and physics.

"At the fundamental level our world is governed not by classical physics, but by quantum physics," says Simon. "We are trying to understand the consequences of that for fundamental concepts such as information and trying to use this understanding to develop new kinds of quantum technology."

Leanne Yohemas | EurekAlert!
Further information:
http://www.ucalgary.ca

More articles from Physics and Astronomy:

nachricht UNLV study unlocks clues to how planets form
13.12.2018 | University of Nevada, Las Vegas

nachricht Unprecedented Views of the Birth of Planets
13.12.2018 | Universität Heidelberg

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: An energy-efficient way to stay warm: Sew high-tech heating patches to your clothes

Personal patches could reduce energy waste in buildings, Rutgers-led study says

What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...

Im Focus: Lethal combination: Drug cocktail turns off the juice to cancer cells

A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.

The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...

Im Focus: New Foldable Drone Flies through Narrow Holes in Rescue Missions

A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.

Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...

Im Focus: Topological material switched off and on for the first time

Key advance for future topological transistors

Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...

Im Focus: Researchers develop method to transfer entire 2D circuits to any smooth surface

What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.

Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

ICTM Conference 2019: Digitization emerges as an engineering trend for turbomachinery construction

12.12.2018 | Event News

New Plastics Economy Investor Forum - Meeting Point for Innovations

10.12.2018 | Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

 
Latest News

Magic number colloidal clusters

13.12.2018 | Life Sciences

UNLV study unlocks clues to how planets form

13.12.2018 | Physics and Astronomy

Live from the ocean research vessel Atlantis

13.12.2018 | Earth Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>