(Yicai Global) Sept. 7 -- The Beijing-Shanghai trunk line, the world's first secure quantum communication backbone network, has passed technical checks as a demonstration product and is ready for operation.
The line is the most secure and extensive communication network in the world.
Construction of the trunk line was completed late last year after 42 months of developing core technologies, such as high-speed quantum key distribution and large-scale quantum network control. It connects military-civilian wide-area quantum communication networks in Beijing and Shanghai, spanning more than 2,000 kilometers across Jinan and Hefei, Taiwan-based newspaper CTNews reported on Sept. 6.
Sub-system tests carried out over the past six months show the network meets all design parameters. The key bitrate is above 20 kilobytes per second, meaning it can accommodate key distribution requests from 10,000 users.
China successfully launched the world's first quantum experimental satellite, Mozi, at Jiuquan Satellite Launch Center on Aug. 16 last year. The Beijing access point for the trunk line will be connected with a Mozi ground station in Xinglong, Hebei province, and a prototype of a satellite-to-ground wide-area quantum communication network has taken shape with a key bitrate of more than 5 kilobytes per second. It will multiply applications of the Beijing-Shanghai trunk line.
After passing the final check, the world's first secure quantum communication line has strengthened China's position as a global leader in the application and commercialization of quantum technology.
Quantum communication is likely to be used in the secure transmission of financial, government and military data in the near future. It can also be used in consumer markets in metropolitan, inter-city and wide-area communication networks and the quantum market could reach CNY100 billion (USD15.4 billion) by 2030.
Quantum key distribution's most salient feature is that if a third party attempts to wiretap the data transmitted, both the sender and receiver will know about it. The method also detects wiretap attempts using quantum superposition or quantum entanglement transmission.