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  Society 
14 of October, 09:34

Physicists have cracked the mystery of light
Russian physicians were the first in the world managed to confuse the light, next to split his photons into different channels and then again to unravel. Similar experience in the scientific world was considered unreal. As convince the experts, this development can be applied to protect information.

The world's first system that allows you to recover the lost quantum entanglement in quantum communication systems and encryption, managed to create a Domestic quantum physicists from the centre together with specialists from the Moscow physical-technical Institute (MFTI) and the Institute of physics of Academy of Sciences (FIAN). The results of the study published in the elite scientific journal Nature Photonics.

As a source of entangled photons in the experiment was applied of the nonlinear crystal titanyl-potassium phosphate with a periodic domain structure. The procedure itself is contained in the mixed light pulse in the channel with "auxiliary" a single photon on a beamsplitter plate. On one of the outputs of the beam splitter plate was the detector of single photons. If the sensor "clicks", this means that the photon was included in the divisor, and so it was.

As a consequence of quantum interference state 2 input pulse beam splitter is changed in the direction of its quantum properties. Found a phenomenon scientists have named quantum catalysis, as "additional" photon, similar to chemical catalyst, in the reaction itself is not involved, but changes the state of the world in a different channel.

The paradox of quantum entanglement (or quantum correlations) at which condition 2 or more objects - atoms, photons, ions - are related is the basis of advanced quantum technologies. This phenomenon, for example, plays a major role in secure quantum communication systems - such systems completely eliminate the possibility of minor "wiretapping".

The work of Russian scientific workers may find use in the creation of quantum repeaters - devices that can restore the quantum information loss during transmission on fiber optic lines, thus - to make them safe.

sections: Society, World News

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