English
Zhongchi
Zhongchi
Zhongchi
Zhongchi
Zhongchi
Zhongchi
Zhongchi
Zhongchi
Zhongchi
Chinese scientists have recently designed a new system for direct quantum communication that employs a hybrid encoding of phase and timestamp quantum states, successfully achieving direct quantum communication over a distance of 100 kilometres! This is currently the longest distance for direct quantum communication in the world!
This research was jointly conducted by the Beijing Academy of Quantum Information Sciences, Professor Long Guilu’s team at Tsinghua University and Professor Lu Jianhua’s team, and has been published in the online edition of the latest issue of *Light: Science & Applications*. In previously published results, the longest distance achieved for direct quantum communication was 18 kilometres.
Quantum direct communication uses quantum states as carriers to encode and transmit information, transforming the dual-channel structure of traditional secure communication. It advances reliable communication under noisy channels to reliable and secure communication under both noisy and eavesdropping channels, enabling not only the detection of eavesdropping but also the prevention of it.
This research demonstrates that, using existing mature technologies, quantum direct communication is feasible in scenarios where relaying is not possible, such as between satellites and the ground, or point-to-point quantum direct communication between certain cities. This can reduce the number of relays, lower link node costs, decrease communication latency, and enhance communication performance and the user experience.
