The unconditional security of quantum key distribution is ensured by the No-cloning theorem

Uncertainty principle and Quantum nonlocality.With the completion of the "Beijing-Shanghai trunk line" and the completion of the three major research tasks of the "Mo-tse" quantum satellite

China has become the first industrialized country in the world in the field of quantum private communication

and has continuously guided the development of this technology.Currently

the practical technology of quantum private communication depends on optical fiber cable and precise optical device.The development of optical fiber optic cable and optical device used for quantum private communication is summarized in this paper

includes Ultra-low loss and large-effective area fiber

high-speed narrow-pulse semiconductor laser

InGaAs/InP near-infrared single photon detector

quantum random number generator based on the time randomness of single-photon pulse and so on.