Shulou(Shulou.com)11/24 Report--

CTOnews.com, March 14, according to the official website of University of Science and Technology of China, Pan Jianwei and Xu Feihu of University of Science and Technology of China have cooperated with researchers from Shanghai Institute of Microsystems, Jinan Institute of Quantum Technology and Harbin Institute of Technology to develop key technologies such as high fidelity integrated photonic quantum state regulation and high counting rate superconducting single photon detection. The real-time quantum key distribution at 100 megabit rate is realized internationally for the first time, and the experimental results increase the previous bitrate record by an order of magnitude. The results were published online on March 14 in the international academic journal Nature Photonics (Nature Photonics).

▲ High bit rate Quantum key Distribution installation Map | Source: University of Science and Technology of China official website Quantum key Distribution (QKD) is based on the basic principles of quantum mechanics and can achieve unconditionally secure secure communication in principle. Improving the bit rate of QKD plays an important role in its practical application. High bit rate can provide services for more users and realize applications with high bandwidth requirements such as big data sharing and distributed storage encryption. Previously, the highest real-time bit rate in the world is 10Mb / s (under 10 km standard fiber channel). In order to achieve higher key rate, it is necessary to solve the technical bottlenecks such as sender, receiver and post-processing of the system.

CTOnews.com learned from the official website of the University of Science and Technology of China that Pan Jianwei and Xu Feihu developed a high-speed and high-fidelity polarization modulation technology on an integrated photon chip, with a repetition rate of 2.5 GHz and a qubit error rate of better than 0.35%. Combined with the latest eight-pixel SNSPD developed by you Lixing team of Shanghai Institute of Microsystems, Chinese Academy of Sciences, single-photon detection with high counting rate and high efficiency is realized, and the detection efficiency can be maintained at 62% when 550 million photons per second are inputted. At the same time, the research group developed polarization feedback control, high-speed post-processing module and so on. On the basis of the above technological breakthroughs, the research team achieved a key rate of 115.8 Mb / s under 10 km standard optical fiber channel, which is about an order of magnitude higher than the previous record. the system has been running stably for more than 50 hours and the bit rate is more than 200b / s at a transmission distance of 328km. The above research results show that QKD can realize real-time key distribution at 100 megabit rate and meet the needs of high-bandwidth communication, which is of great significance for large-scale practical applications of quantum communication in the future.

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