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| 2023-09-27 11:02:47 | onclick： | China University of Science and Technology Achieves Full Passive Quantum Key Distribution |
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Guo Guangcan's team at China University of Technology has made important progress in quantum key distribution research.The team Han Zhengfu, Wang Shuang, Yin Zhenqiang, Chen Wei and others proposed a new scheme of quantum key distribution without active modulation.On 13 September, the results were published in the Physical Review Express.
Quantum key distribution theory can realize unconditionally secure key sharing.However, some factors such as device characteristics, modulation accuracy and environmental interference may cause practical security problems.For example, Guo's team found that lithium niobate active modulation devices, widely used in the system, could be compromised by side channel attacks such as photorefraction.
In order to solve the hidden dangers caused by active modulation, Guo Guangcan's team and collaborators have developed a new way to design a quantum key distribution system that does not require active modulation.The scheme overcomes the contradiction between passive optical emphasis and quantum state coding, and gives a strict security key rate considering the finite length effect.The team solves the problem of channel environmental interference by fully passive timestamp-phase coding, and solves the problem of excessive data throughput by optimizing the strategy.
Security is the core value and requirement of quantum key distribution.It is one of the keys to advance the practical application of quantum key distribution to explore protocols with higher reality security and design corresponding schemes and systems.The researchers introduced that the research provides a new way to realize high-realistic and secure quantum key distribution system, which is of great significance to the practicalization and standardization of this field.
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