Chinese scientists have implemented twin-field quantum key distribution (QKD) through an 833-km optical fiber, setting a new world record in the relevant field.
The experiment, led by Guo Guangcan and Han Zhengfu from the University of Science and Technology of China, is a solid step towards building reliable and efficient terrestrial quantum-secure networks over a scale of 1,000 km.
According to the law of quantum physics, the photons carrying signals cannot be amplified or relayed via classical optical techniques to maintain quantum security. As a result, the transmission loss of the channel limits its achievable distance, and this has been a huge barrier to building large-scale quantum-secure networks.
Fiber-based QKD is a new technology that may realize this goal. The experiment results have been published recently in Nature Photonics, a peer-reviewed scientific journal under the Nature Publishing Group. (Xinhua)
Researchers from the University of Science and Technology of China and their collaborators developed a system that can not only promise twin-field quantum key distribution over a 658-km optical fiber, but also sense channel vibration with an accuracy better than one km.
Chinese scientists have achieved twin-field quantum key distribution (TF-QKD) through a 511-km optical fiber linking two distant metropolitan areas, proving the technical feasibility in a practical environment and paving the way towards a long-haul fiber quantum network.
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