Lu Feng-Yu, Wang Ze-Hao, Zapatero Víctor, Chen Jia-Lin, Wang Shuang, Yin Zhen-Qiang, Curty Marcos, He De-Yong, Wang Rong, Chen Wei, Fan-Yuan Guan-Jie, Guo Guang-Can, Han Zheng-Fu
CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
Phys Rev Lett. 2023 Sep 15;131(11):110802. doi: 10.1103/PhysRevLett.131.110802.
The passive approach to quantum key distribution (QKD) consists of removing all active modulation from the users' devices, a highly desirable countermeasure to get rid of modulator side channels. Nevertheless, active modulation has not been completely removed in QKD systems so far, due to both theoretical and practical limitations. In this Letter, we present a fully passive time-bin encoding QKD system and report on the successful implementation of a modulator-free QKD link. According to the latest theoretical analysis, our prototype is capable of delivering competitive secret key rates in the finite key regime.
量子密钥分发（QKD）的被动方法包括从用户设备中去除所有有源调制，这是消除调制器侧信道的一种非常理想的对策。然而，由于理论和实际限制，到目前为止，有源调制在QKD系统中尚未完全消除。在本信函中，我们展示了一种完全被动的时间编码QKD系统，并报告了无调制器QKD链路的成功实现。根据最新的理论分析，我们的原型能够在有限密钥体制下提供具有竞争力的密钥率。
