Scientists in China Achieve Quantum Key Distribution in Thousand Kilometers of Relay Free Fiber Optics

Tech 2023-05-30 08:49:28 Source: Network

Hefei, May 29 (Reporter Xu Jing) -- Pan Jianwei and Zhang Qiang of the University of Science and Technology of China, together with Wang Xiangbin of Tsinghua University, Liu Yang of Jinan Institute of Quantum Technology, You Lixing and Zhang Weijun of the Shanghai Institute of Microsystems and Information Technology of the Chinese Academy of Sciences, have cooperated to achieve 1002km point-to-point long-distance quantum key distribution in optical fibers by developing technologies such as low crosstalk phase reference signal control and extremely low noise single photon detectors, Not only has it set a world record for fiber optic relay free quantum key distribution distance, but it also provides a solution for high-speed backbone links in intercity quantum communication. The relevant research results were recently published in the international academic journal "Physical Review Letters"

Hefei, May 29 (Reporter Xu Jing) -- Pan Jianwei and Zhang Qiang of the University of Science and Technology of China, together with Wang Xiangbin of Tsinghua University, Liu Yang of Jinan Institute of Quantum Technology, You Lixing and Zhang Weijun of the Shanghai Institute of Microsystems and Information Technology of the Chinese Academy of Sciences, have cooperated to achieve 1002km point-to-point long-distance quantum key distribution in optical fibers by developing technologies such as low crosstalk phase reference signal control and extremely low noise single photon detectors, Not only has it set a world record for fiber optic relay free quantum key distribution distance, but it also provides a solution for high-speed backbone links in intercity quantum communication. The relevant research results were recently published in the international academic journal "Physical Review Letters".

Quantum key distribution is based on the fundamental principles of quantum mechanics, which enables secure key distribution between users, combined with a "one-time encryption" encryption method, to achieve the highest security of secure communication. The working distance of quantum key distribution systems is limited by factors such as the inherent loss of communication fibers and detector noise. The dual field quantum key distribution protocol utilizes the characteristics of single photon interference and can theoretically achieve a coding distance far exceeding that of general quantum key distribution schemes.

This work not only verifies the feasibility of the dual field quantum key distribution scheme at extremely long distances, but also verifies that using this protocol can achieve high bit rate quantum key distribution at intercity optical fiber distances, making it suitable for use in intercity quantum communication backbone links.

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