physics news

'Superradiant' laser created for first time

A new type of laser in which light is emitted collectively by several atoms at the same time – rather than just one – has been unveiled by physicists in the US. Their "superradiant" laser, which is based on a concept first described in 1954 by the US physicist Robert Dicke, has the potential to be up to 1000 times more stable than the best conventional visible lasers. It could therefore be used to boost the performance of the most advanced atomic clocks, although much more development work will be needed before that goal is fulfilled

http://physicsworld.com/cws/article/news/2012/apr/05/superradiant-laser-created-for-first-time


No-photon laser: Physicists demonstrate 'superradiant' laser design



Physicists at JILA have demonstrated a novel "superradiant" laser design, which has the potential to be 100 to 1,000 times more stable than the best conventional visible lasers. This type of laser could boost the performance of the most advanced atomic clocks and related technologies, such as communications and navigation systems as well as space-based astronomical instruments http://www.physorg.com/news/2012-04-physicists-superradiant-laser.html.


Quantum control protocols could lead to more accurate, larger scale quantum computations

A protocol for controlling quantum information pioneered by researchers at UC Santa Barbara, the Kavli Institute of Nanoscience in Delft, the Netherlands, and the Ames Laboratory at Iowa State University could open the door to larger-scale, more accurate quantum computations. Their findings, in a paper titled "Decoherence-protected quantum gates for a hybrid solid-state spin register," are published in the current issue of the journal Nature http://www.physorg.com/news/2012-04-quantum-protocols-accurate-larger-scale.html.


Quantum interference: the movie

Wave–particle duality captured on film

The first real-time movie of large molecules creating an interference pattern after passing through two slits has been made by an international team of physicists. As well as being a beautiful example of the wave–particle duality of quantum mechanics, the technique could provide further insight into the boundaries between quantum and classical physics http://physicsworld.com/cws/article/news/49145




Electrons tunnel nicely through boron nitride


Boron-nitride sandwich



Ultrathin sheets of hexagonal boron nitride (h-BN) could make for the ideal dielectric layer in future electronic components, thanks to a high degree of uniformity in how electrons tunnel through the material. That is the claim of an international team of researchers that is studying how the material performs as a barrier layer that is ....http://physicsworld.com/cws/article/news/49177

 


 



Genius Words

 

One of Einstein's great insights was to realize that matter and energy are really different forms of the same thing. Matter can be turned into energy, and energy into matter.

أحد أعظم أفكار آينشتين وهي إدراك أن المادة والطاقة هما شكلان مختلفان من الشيء نفسه أي أن المادة والطاقة وجهان لعملة واحدة. وهذا يعني أن المادة يمكن أن تتحول إلى طاقة، والطاقة تتحول إلى مادة. 

Elctromagnetic waves

الموجات الكهرومغناطيسية

Spectral analysis of light

التحليل الطيفي للضوء

إعلانات


سيكون بمشيئة الله اجتماع لطالبات الارشاد الأكاديمي يوم الأحد بتاريخ 1435/11/5 هـ

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