Russian physicists first in the world have managed to restore the “confusion” of the quantum of light – Ghhauto: Russian top stories

13.10.2015 01:47

Russian physicists were able to create the world’s first system that allows to recover lost quantum entanglement in quantum communication systems and encryption. It significantly extends the scope of information transfer on such a secure communication channels, RIA Novosti reported.

Researchers representing the Russian Quantum Center, learned in practice to recover lost quantum entanglement, which significantly extends the capabilities of quantum communication and quantum cryptography. His scientific work researchers published in the journal Nature Photonics. The team of authors also included scientists from the Moscow Institute of Physics and Technology (MIPT) and the Physics Institute of the Academy of Sciences (FIAN).

A group of Russian physicists led by Alexander Lvov learned to restore these quantum link between particles during experiments ” sooty “optical fiber, in which the signal is fading very quickly due to the insertion of dark glass and a special device that amplifies coming out of it photons.

This procedure consists in mixing almost extinct pulse of the optical fiber with a” subsidiary “of a photon Using a special beam splitter plate, which paradoxically reinforces its quantum properties.

This phenomenon discovered Lviv and colleagues in 2002, was named by them quantum catalysis because “auxiliary” photon, like a catalyst in chemistry itself is not consumed in the reaction, but it changes the state of light in the other channel.

« While this phenomenon seemed no more than a curious phenomenon in quantum physics, what the set. Now it turns out that it is of great practical use – it allows you to restore entanglement of quantum states of light », – says Lviv, whose words the press service of the Roman Catholic Church.

According to him, this work – step towards the creation of a quantum repeater – a device capable of reducing the loss of quantum information over fiber optic links. In the future, this will create a global system of transmission of quantum information, and will remove restrictions for the quantum cryptography.

« Of course, the restoration of confusion has to be paid – a million little entangled pairs of photons obtained a highly complicated. But this level of correlation is restored to the primary, and while the data rate is somewhat reduced, we can get a stable connection at a much greater distance », – concludes another author, Alexander Ulanov.