News Item: In MIPT figured out how to create a fast quantum Internet
(Category: Новости)
Posted by Slava
Tuesday 13 March 2018 - 16:19:23

The work of Russian physicists will help to make the quantum communication line such as fast as the classic.

The team of Dmitry fedyanina of the MIPT developed an led able to emit several billion single photons per second. The work of Russian physicists will help to make the quantum communication line such as fast as the classic. A scientific paper published in the journal npj Quantum Information.

A quantum computer can dream of in nightmares to anyone who has money in Bank accounts or sensitive information in databases. It is expected that this machine will be able to crack any modern encryption ciphers for fractions of a second.

Fortunately, quantum physics itself suggests a solution. We are talking about quantum cryptography. In this case information security is not based on the encryption algorithms and the unbreakable physical law: it is impossible to consider a quantum system with its state, not under it. By connecting to this link, the attacker will immediately change the data that is trying to read. The recipient will notice it and take action.

However, such a serene picture is possible only if the quantum state is transferred by a single photon. If the source emits several photons in the same state, the "spy" will be able to read information from one of them, and the recipient "reads" the other, intact, and did not notice. Consequently, the necessary technology for the radiation of single photons.


As is known, the quantum system emits a photon when it passes from the excited state to a state of lower energy. It remains to find the system, convenient in practical application. Here is the crux of the matter. Some substances are "working" as such emitters only at very low temperatures (around minus two hundred Celsius), others may not provide the desired performance.

"In 2014, we happened to notice silicon carbide, and immediately appreciated its potential," says Fedyanin.

The irony is that with this substance once began optoelectronics. Still in 1920-e years lit up the world's first LEDs, and the light in them is silicon carbide. In General, he became the first substance, which was observed electroluminescence (glow by passing an electrical current). However, in the 1980s it was completely superseded by more modern materials and almost forgotten.

It seems, now finds a substance in the field of optoelectronics second life. Fedyanin and his colleagues examined the physics of the emission of single photons with this material and developed a theory that explains and accurately reproduces experimental results. Using this model, researchers have shown how to improve the led light that it emitted billions of single photons per second. And this is what is required for communication at speeds of the order of one Gigabit per second.

Moreover, this element is compatible with a Microsoft technology known as CMOS (complementary "metal oxide semiconductor"). And it is this complex of technological solutions used for the production of most modern circuits. So to give the invention a start in life will be relatively easy.

Recall that "Conduct.Science" (nauka.vesti.ru) previously wrote about the created in Russia, record high-quality signal amplifier for a quantum computer. We talked about the quantum random number generator, and new algorithms for quantum encryption.




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