China Telecom has been deeply cultivating quantum-classical co-fiber transmission technology, and continuous attack experiments have yielded fruitful results Recently, it successfully completed the world's first over-hundred-kilometer air-core fiber co-fiber transmission experiment, setting a new record in the field and a milestone breakthrough in China's quantum-classical co-fiber transmission technology. This achievement was completed by the research institute of China Telecom relying on the cloud network integration science and technology device, in conjunction with China Telecom Quantum Group, USTC Great Shield Quantum, Changfei, ZTE, and Beijing University of Posts and Telecommunications The co-fiber transmission of quantum and classical signals is the core bottleneck to achieve the large-scale deployment of quantum communication. In traditional solid-core fibers, the are prone to mutual interference, making it difficult to balance security and capacity. The research and development team proposed an innovative frequency spectrum collaborative allocation mechanism and a multi-source crosst suppression strategy, achieving efficient and stable co-fiber transmission of quantum and classical signals, solving the industry pain points of mutual interference between quantum and classical signals in traditional solid- fibers, and enabling the system to have the comprehensive advantages of low noise, high security, large capacity, and low complexity. This has cleared a key obstacle for the implementation. The four core indicators achieved in the experiment have all reached the world's leading level: one is that the transmission distance reaches 101.6 kilometers; second is that it supports 21 dBm high-power transmission; the third is that the transmission capacity reaches 37.6 Tbps; the fourth is that the key rate remains stable at the level of 5kbps, which has been greatly improved compared with the existing data and meets the needs of business applications. The related research results have published in the Journal of Optical Communications and Networking and the European Conference on Optical Communications (ECOC), which are international top academic platforms. This not only achieves independent controllable core technology but also exports China's quantum communication technology program to the world, demonstrating industry discourse power.
The industrial prospects of this breakthrough are well-regarded, and it is expected to inject innovative momentum into multiple fields. In network construction, it significantly reduce the deployment cost of integrating quantum communication with the existing classical communication network, accelerating the large-scale implementation of quantum communication; in the security field, it can provide ultrahigh security communication guarantee with "information-theoretically provable" for key industries such as financial transactions, government data, and energy dispatch, fortifying the digital security barrier; the industrial level, it will promote the transition of hollow-core fibers from the laboratory to large-scale commercial use, driving the upgrading of the entire industry chain, including fiber manufacturing quantum devices, and information and communication technology (ICT), and cultivating new growth points. Dr. Tang Jianjun from the China Telecom Research Institute stated that the future, they will continue to deepen technology research and development in conjunction with industry, academia, and research partners, accelerate the landing of "quantum network" integrated application, provide technical support for national communication security, help achieve high-quality development of the digital economy, and contribute to the construction of a strong network country and digital China.
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