China's quantum communication ranks among the top in the world. What technologies have been applied to life?

Quantum is an important concept in modern physics. M is the earliest? Planck proposed it in 1900. He assumes that the radiation energy in blackbody radiation is discontinuous and can only be an integer multiple of the basic unit of energy. Later research shows that not only energy shows this discontinuous separation property, but also other physical quantities such as angular momentum, spin and charge show this discontinuous quantization phenomenon. This is essentially different from classical physics represented by Newtonian mechanics. In classical physics, the atom is considered as the smallest unit. In classical physics, according to the equipartition theorem of energy, energy is constantly changing and can take any value. Quantization is mainly manifested in the micro-physical world.

The physical theory describing the micro-physical world is quantum mechanics, and quantum communication is considered as the most important technical means to ensure the future communication security. Based on the patent analysis method, the development status and market competition situation of quantum communication technology in the world and China are studied and analyzed. In the basic research and application technology of quantum communication, the level of quantum communication technology in the United States, Japan, China and other countries is in the forefront of the world. The successful launch of Mozi quantum communication satellite indicates that China has made great success in the development of quantum communication technology. Quantum communication, as a new information communication mode with unconditional security, has gradually entered people's field of vision. This paper first discusses the basic scientific problems involved in quantum satellites from the launch of Mozi satellite, and then introduces the quantum communication technology in China.

For the quantum communication industry, its industrial chain mainly includes four links: components, core equipment, transmission trunk lines and system platforms. The world's first commercial trunk line of quantum communication? Shanghai-Hangzhou trunk line? (Zhejiang section) announced its opening; 165438+1October 2 1, National Quantum Communication Backbone Network? Beijing-Shanghai trunk line? The Hefei-Shanghai section of the project was successfully opened, which is the longest quantum secure communication backbone network opened in the world at present and is expected to be completed by the end of this year.