Halfway around the world What signals are transmitted by the first intercontinental quantum secure c

On September 29thThe world's first quantum secure communication trunk line, the "Beijing-Shanghai trunk line", was officially opened。On the same day, combined with the "Beijing-Shanghai trunk line" and the "Mozi" heaven and earth link,Chinese scientists have successfully achieved intercontinental quantum secure communication。This marks that China has built the first prototype of a space-ground integrated wide-area quantum communication network in the world, and has taken a solid step forward for the realization of a quantum secure communication network covering the world in the future.

The Beijing-Shanghai Trunk Line project was approved in July 2013, under the unified leadership of the Chinese Academy of Sciences, and undertaken by the University of Science and Technology of China as the main body of the project, with a construction period of 42 months. During the construction period, the "Beijing-Shanghai Trunk Line" project team made breakthroughs in a series of key technologies such as high-speed quantum key distribution, high-speed and high-efficiency single-photon detection, trusted relay transmission and large-scale quantum network control and monitoring, and completed the technical acceptance of the whole network in Hefei at the end of August 2017.

After the completion of the "Beijing-Shanghai trunk line", the quantum communication backbone network with a total length of more than 2,000 kilometers connecting Beijing and Shanghai, Jinan and Hefei has been realized, and the connection with the "Micius" has been realized through the Beijing access pointA solid step forward for the realization of a quantum secure communication network with global coverage in the future.

Quantum communication is the only communication method that has been rigorously proven to be unconditionally secure so far, which can effectively solve the problem of information security. It is reported that in the future, based on the "Beijing-Shanghai trunk line", we will promote the large-scale application of quantum communication in the fields of finance, government affairs, national defense, electronic information, etc., establish a complete quantum communication industry chain and the next generation of national sovereignty information security ecosystem, and finally build a quantum Internet based on quantum communication security. In addition, the completion and opening of the Beijing-Shanghai trunk line will also attract and cultivate a number of upstream and downstream enterprises in the field of quantum secure communication, making the quantum secure communication industry an important strategic emerging industry in China.

China's rapid development of science and technology, leading the world's advanced level!

According to <>, the research team composed of Professor Pan Jianwei and his colleague Peng Chengzhi of the University of Science and Technology of China, together with the Wang Jianyu research group of the Shanghai Institute of Technical Physics of the Chinese Academy of Sciences, the National Astronomical Observatories, etc., and the Antonzeilinger research group of the Austrian Academy of Sciences, used the "Micius" quantum science experiment satellite to realize the intercontinental quantum key distribution between China and Austria for the first time with a distance of 7,600 kilometers, and used the shared key to achieve encrypted data transmission and communication.

This achievement indicates that Micius has the ability to realize intercontinental quantum secure communication, and lays a solid foundation for the construction of a global quantum communication network in the future.

The relevant results were published in the form of a cover page in an international authoritative academic journal published on January 19.

The successful docking between the Micius Bon Chan satellite and ground stations in different countries and regions shows the feasibility and adaptability of quantum communication between the Micius satellite and any place in the world, and lays the foundation for the formation of international technical standards for satellite quantum communication.