In today's Information Age, the protection of information is of critical importance for national security, business firms, and private individuals. The common long-distance communication technology is poor in keeping privacy as it is vulnerable to eavesdropping. Quantum cryptography, a new approach to communication based on certain phenomena of quantum physics, is considered the absolute secure method in this regard. Recently CAS scientists have made progress in secure communication based on quantum cryptography. In their experiment, Pan Jianwei, Yang Tao, Peng Chengzhi and colleagues from CAS-affiliated University of Science and Technology of China (USTC) are successful in the free-space distribution of entangled photon pairs in a noisy city environment with a distance beyond the effective thickness of the aerosphere, marking a significant step towards the satellite-based global quantum communication.
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