Via Chinese satellite
Russia and China conducted joint tests of a quantum communication system for the first time, transmitting information over a distance of about 3800 km.
The Chinese Mozi satellite was used for the experiment, and in Russia the country's first ground-based satellite quantum communication station was built specifically for this purpose.
Through the efforts of a large collaboration of scientists and engineers, a unique receiving station has been created, which allows for stable communication sessions with the satellite, as well as decoding the polarization states of single photons sent by it. Satellite quantum cryptography opens up fundamentally new possibilities for protecting the data of objects located at a great distance
Director of the Institute of Physics and Quantum Engineering NUST MISIS (Moscow) Alexey Fedorov
So far, quantum communications cannot compete with the usual fiber-optic connection in terms of bandwidth, and it is unlikely to be able to in the coming years. However, for a number of scenarios, the security of such technology is much more important than the data transfer speed.