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Quantum communication line protected from eavesdropping.

 

 

The first quantum communication line for industrial and commercial applications are created and launched in Russia in 2016, the Russian project of the quantum communication line different from similar developments from other countries. It used a specially created line of quantum communication, and an ordinary fiber-optic line. In other words, the technology can be widely applied, and it does not need to be redesigned.

 

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The first quantum communication line for industrial and commercial applications are created and launched in Russia in 2016

The Russian project of the quantum communication line different from similar developments from other countries. It used a specially created line of quantum communication, and an ordinary fiber-optic line. In other words, the technology can be widely applied, and it does not need to be redesigned.

In modern information networks data is transmitted in a stream of flashes of light in optical fiber: if the flash is – the unity, if not zero. But such transfer of information is unsafe, because these outbreaks can be quite easily “peep” using a special technique, in this case, neither the recipient nor the sender would not know that the message was intercepted.

The basis of modern quantum technologies is the phenomenon of quantum entanglement. This phenomenon excludes discreet listening. This is achieved through the laws of quantum mechanics, which prohibits “cloning” the state of the light particles.

In the case of using quantum communication photons transmitted by certain groups, and zeros and ones are written in a special way. In that case, if someone else wants to intercept the letter, he probably will, but this is, firstly, will not go unnoticed, and secondly, it is unlikely he will read this message.

Modern optical lines of communication do not guarantee confidentiality of information, since fiber optic lines moving millions of photons, largely duplicative, and some of them can be intercepted transparently to the recipient.

Quantum cryptography uses as a carrier of information single photons, so when they intercept, they will not reach the addressee, and that immediately will signal about the ongoing espionage. To hide the interception, the spy needs to measure the quantum state of the photon (polarization or phase) and send to the addressee “duplicate”. But according to the laws of quantum mechanics this is impossible, since any measure changes the state of a photon, that is, makes it impossible to create a “clone”. This fact ensures complete privacy of data transmission.

 

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