Experimental secure quantum key distribution in presence of polarization-dependent loss

• URL: http://arxiv.org/abs/2201.00936v1
• Date: Tue, 4 Jan 2022 01:58:00 GMT
• Title: Experimental secure quantum key distribution in presence of polarization-dependent loss
• Authors: Chunfeng Huang, Ye Chen, Long Jin, Minming Geng, Junwei Wang, Zhenrong Zhang, and Kejin Wei
• Abstract summary: Quantum key distribution (QKD) is theoretically secure using the principle of quantum mechanics. We experimentally characterized polarization-dependent loss in realistic state-preparation devices. We achieved rigorous finite-key security bound over up to 75 km fiber links.
• Score: 11.396173835009412
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum key distribution (QKD) is theoretically secure using the principle of quantum mechanics; therefore, QKD is a promising solution for the future of secure communication. Although several experimental demonstrations of QKD have been reported, they have not considered the polarization-dependent loss in state preparation in the key-rate estimation. In this study, we experimentally characterized polarization-dependent loss in realistic state-preparation devices and verified that a considerable PDL exists in fiber- and silicon-based polarization modulators. Hence, the security of such QKD systems is compromised because of the secure key rate overestimation. Furthermore, we report a decoy-state BB84 QKD experiment considering polarization-dependent loss. Finally, we achieved rigorous finite-key security bound over up to 75 km fiber links by applying a recently proposed security proof. This study considers more realistic source flaws than most previous experiments; thus, it is crucial toward a secure QKD with imperfect practical devices.

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