Researchers succeed in generating quantum entanglement at high speed, realization of 'quantum internet' approaches

byTaras Mykytyuk

Quantum cipher"Developed based on the technology of"Quantum network"Is"Eavesdropping of information is completely impossibleAlthough it has the advantage that it has the advantage of being able to realize, many barriers are settled. In the meantime,Quantum entanglement"We succeeded in creating the link at high speed, and it is reported that" It has drastically approached the realization of quantum network ".

Deterministic delivery of remote entanglement on a quantum network | Nature
https://www.nature.com/articles/s41586-018-0200-5

Delft scientists make first 'on demand' entanglement link
https://www.tudelft.nl/en/2018/tu-delft/delft-scientists-make-first-on-demand-entanglement-link/

DutchDelft University of TechnologyA company that conducts research related to quantum technology jointly with "QuTech"ofRonald HansonA research team led by Mr. Suzuki succeeded in generating a "quantum entanglement" link, which plays an important role in constructing a quantum network, without interruption between quantums at two points. Quantum and linkage means that the quantum between two points behaves as if it were one quantum in two and the information on one quantum is instantaneously transferred to the other quantum.

In 2015, the research team of Mr. Hanson and his colleagues succeeded in creating a quantum link between two points separated by 1.3 km and became global news. However, as of 2015, the quantum network can be connected only once per hour, even one second per one time, and twonodeI could only connect between them. It is difficult to maintain the link of quantum entanglement for a long time, and the quantum network can not operate without forming the link of quantums again before the quantum linkage is canceled. From these problems, it seems that no practical quantum network was constructed.

Therefore, Hanson et al. Devised a new method of quantum entanglement and succeeded in generating a link with quantum entanglement of 40 times per second for two quanta at a distance of 2 m. With the new method, it becomes possible to form a link of quantum entanglement at several thousand times faster than before, and it is expected that it will be possible to construct a quantum network by combining it with a method of protecting the link of quantum entanglement from the outside . Mr. Peter Humphries, who is a co-author of a paper jointly conducted the experiment with Mr. Hanson, said, "The experiment has already passed beyond the hurdle for practical use," and it is said that building a practical quantum network It is going to not take long.


Mr. Hanson said, "I hope to connect the four cities in the Netherlands with quantum networks in 2020. This will be the first" quantum internet "in the world."