A team of physicists and engineers have demonstrated all-fibre quantum logic, where single photons are generated and used to perform the contolled-NOT quantum logic gate in optical fibers with high fidelity.
The only quantum technology in practical use today is quantum cryptography and is currently limited in the distance over which secure communication may occur.
More sophisticated quantum networks will require multiple nodes with the ability to implement small-scale quantum processing in order to increase the range of quantum communications. Such networks will rely on optical fibre links, making fibre-based photon generation and information processing of key technological importance.
If you watched "Angels&Demons" recently, you may have thought particle physics was just about scary science that could do real harm on the chance it may do future good.
Not so, though most people don't realize the impact particle physics has had on society. Particle physics saves lives, connects continents through new channels of communication and generally helps us understand the world around us. In many ways it inspires tomorrow’s leaders.
While the perils associated with particle physics, from Earth-gobbling black holes to Vatican-destroying amounts of antimatter, gain news headlines, it’s easy to overlook the large economic and societal benefits of particle physics research.
Five-fold symmetry is considered to be impossible in crystallography for the same reason that pentagonal tiles do not exist - it is not possible to cover a floor or wall simply using tiles with five sides of all the same length.
The only way around the problem is to use other geometrical shapes to fill in the gaps, a principal used by the builders of mosques as long ago as the 15th century. The complex ornamental structure was "rediscovered“ by mathematicians last century.
Roger Penrose demonstrated a pattern named the Penrose Parquet, which achieves complete coverage following simple rules using two periodically repeating geometrical forms.
The Centre for Epidemiological Studies into Sexually-Transmitted Diseases and AIDS in Catalonia (CEEISCAT) started a pioneering study in Spain in 2005 to look into the prevalence of sexually-transmitted diseases (STDs) among female sex workers (SWs). The objective was to monitor the rates of infection with both HIV and other diseases over time, as well as the prevalence of risky behavior.
Following on the heels of
'missing links' in the popular media earlier this month, you might expect that research on mice carrying a "humanized version" of a gene believed to influence speech and language will have references to cartoons and mice that talk.
In reality, it's nothing so outrageous but the research can still teach us about our evolutionary past - even if the mice don't speak.
Two things men believe; first, women like them more when they are taken and second, a woman's relationship status influences her interest in the opposite sex.
At least that second part appears to be true.
In a new study, women both with and without sexual partners showed little difference in their subjective ratings of photos of men when considering such measures as masculinity and attractiveness. However, the women who did not have sexual partners spent more time evaluating photos of men, demonstrating a greater interest in the photos. No such difference was found between men who had sexual partners and those who did not.
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