Instant data transmission cannot be hacked

Two experiments of instantaneous quantum information transmission have been successfully implemented in Canada and China.

According to Science Alert, the two research teams have successfully performed quantum information testing via fiber optic networks with distance from the most remote destination of more than 12km in Calgary, Alberta, Canada, and the city. Hefei, Anhui Province, China.

This experiment not only proves that instantaneous quantum teleportation is real , but also opens up a feasible technology to build communication systems that cannot be hacked between cities, even continents.

Instant teleportation, or quantum teleportation, works based on a strange phenomenon called quantum entanglement (also known as quantum entanglement) . A pair of quantum entangled particles means that any impact on one particle will immediately affect the other, regardless of the distance.

Experiment in Calgary by Canadian team.(Photo: Nature).

Using this property, quantum teleportation allows the quantum state of a particle to be transferred to the remaining particle regardless of the distance or any physical connection between them.

The information transmitted by this quantum path will be completely encoded, can only be decoded if the state of the particle is entangled with quantum. In other words , information cannot be hacked.

In two papers published in the Nature Photonics magazine of the two groups on Sept. 19, Canadian and Chinese scientists came to the conclusion that being able to transmit instant information through existing fiber-optic systems, a factor It is very important to build a quantum information system available.

In 2012, quantum teleportation at a distance of 143km was successfully implemented by an Austrian team using lasers, but it was not feasible to use fiber optic cables.

Principles

On New Scientist, author Anil Ananthaswamy described the principle of this experiment as follows: A and B want to share a cryptographic key through C. A will send C a particle containing the information, and B makes " two quantum entanglement" and sends C a particle.

C will then measure two particles received from each person, making them no longer different. In other words, the quantum state and information from the particle of A were transferred to the particle of B, in place of C. That information was immediately transmitted to B through two quantum entangled particles. Thus, B has received a message from A, through a transit is C.

The Canadian team's experiment proceeded in the same order, with the communication distance calculated from C to B of 6.2 km, through the Calgary's fiber optic network, according to chief researcher Wolfgang Tittel, University of Calgary .

Experiment in Hefei of the Chinese group.(Photo: Nature).

The Chinese team extends the communication distance to 12.5km by placing C in between A and B, causing a pair of particles to entangle and send one to B.

The Canadian group model can also extend the communication distance by using B as a quantum repeater to send information further.

Although the delivery speed of this method is instantaneous, but to decrypt the information that requires the key, is sent through normal transmission lines. Therefore, the total speed will not be faster than traditional communication methods, but the security is greatly increased.