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, Tsinghua University and Shanghai Institute of Microsystem and Information Technology, demonstrated new-found twin-field QKD (TFQKD) through the sending-or-not-sending protocol with a realistic phase drift over 300 km optical fiber spools on the basis of a single photon detector with a high detection rate.
A team of researchers has demonstrated secure quantum communication between two ground stations, with a record distance of 1,120 km and no intermediate security relays. This is seen as a new step forward toward the practical application of quantum communication.
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