期刊
OPTICA
卷 9, 期 5, 页码 492-500出版社
Optica Publishing Group
DOI: 10.1364/OPTICA.450573
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类别
资金
- National Key Research and Development Program of China [2016YFA0301403]
- National Natural Science Foundation of China [62175138]
- Key Research and Development Program of Guangdong Province [2020B0303040002]
- Shanxi [1331KSC]
Measurement-device-independent quantum key distribution (MDI-QKD) can eliminate all side-channel attacks on detectors. This research successfully demonstrated continuous-variable MDI-QKD over optical fiber and proved its feasibility in practical applications.
Measurement-device-independent quantum key distribution (MDI-QKD) can remove all side-channel attacks on detectors. In the context of the dramatic progress of discrete-variable MDI-QKD and twin-field QKD, owing to the critical challenge of continuous-variable (CV) Bell-state measurement (BSM) of two remote independent quantum states, experimental demonstration of CV-MDI-QKD over optical fiber has remained elusive. To solve this problem, a technology forCV-BSM of remote independent quantum states is developed that consists of optical phase locking, phase estimation, real-time phase feedback, and quadrature remapping in the present work. With this technology, CV-BSM is accurately implemented, and the firstCV-MDI-QKDover optical fiber is demonstrated, to our knowledge. The achieved secret key rates are 0.43 (0.19) bits per pulse over a 5-km (10-km) optical fiber. Our work shows that it is feasible to build a CV-MDI-QKD system over optical fiber. Further, the results pave the way towards realization of a high secret key rate and low-cost metropolitan MDI-QKD network, and serve as a stepping stone to a CV quantum repeater. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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