The ability to securely transmit data is crucial for today’s digital society. One promising cryptographic approach that exploits the fundamental laws of quantum physics is known as twin-field quantum key distribution (twin-field QKD). A team of researchers led by Jian-Wei Pan and Teng-Yun Chen at the University of Science and Technology of China, and by Xiang-Bin Wang at the Jinan Institute of Quantum Technology, China, has now demonstrated this technique over the longest distance to date in a real-world setting [1]. The team says that the demonstration confirms the feasibility of the technique outside of the lab.
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