The laboratory aboard the Mo Tzu satellite has successfully carried out the separation of a pair of "entangled photons" at a distance of 1200 km. Which is an order of magnitude higher than the previous achievement of 100 km, but even that is not interesting. Previously, the movement of photons was carried out only through noise-immune fiber, but Chinese scientists were able to transfer them from a ground station into space and from there to a receiver in another part of the planet.
Einstein was once against the theory of "entangled photons", as it refuted the postulate that there is nothing faster than the speed of light in the universe. And "quantum entanglement" states that the connection between two bound particles is preserved, even if they are separated very far and is realized instantly. That is, there is a teleportation of properties, which violates many of the usual physical principles.
But if it works and can be beneficial, then why limit yourself to old prohibitions? The Mo-Tzu satellite, named after the great Chinese thinker, was specially created to practice quantum teleportation. And now its developers celebrate the well-deserved success - the experiment opens the way to the creation of a communication system that is potentially "a trillion times more efficient" than all existing ones.
The most difficult engineering challenge is hidden behind beautiful words. A laser beam splitter is installed on the satellite, which forms it into two polarized states for receiving and sending entangled photons. The movement of particles occurs between space and the Earth, in motion at high speeds - it's like "hitting a coin into the slot of a piggy bank from a height of 100 km." But this is exactly what Chinese engineers and scientists have done!
Now that the practical possibility of quantum teleportation over long distances has been demonstrated, the dream of instant and most reliable communication is turning into a working project. The breakthrough has been accomplished, the rest is a matter of technology and finance, but there will be no question behind them - quantum communication cannot be hacked in principle, so the Chinese authorities will obviously not be stingy with the implementation of such an innovation.