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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