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Unidimensional Gaussian modulation continuous-variable quantum key distribution (UD CV-QKD) uses only one modulator to encode information, which has the advantages of low implementation cost and low random number consumption, and is attractive for the future construction of miniaturized and low-cost large-scale quantum communication networks. However, in the actual application of the protocol, the intensity fluctuation of the source pulsed light, device defects, and external environmental interference maybe lead to the generation of source intensity errors, which affect the realistic security and performance of the protocol. To address this problem, this paper deeply studies the security and performance of UD CV-QKD under source intensity errors. The influence mechanism of source intensity errors on the protocol parameter estimation process is analyzed. To enable the protocol to operate stably under various realistic conditions and ensure communication security, this paper makes three practical assumptions about the sender’s abilities, and proposes corresponding data optimization processing schemes for these assumptions to reduce the negative impact of source intensity errors. Additionally, both source errors and finite-size effect are comprehensively considered to ensure the realistic security of the system. The simulation results indicate that source intensity errors cannot be neglected and the maximum transmission distance of the system will be reduced by approximately 20 kilometers for significant intensity fluctuations. Therefore, in the practical implementation of the protocol, the impact of source intensity errors must be fully considered, and the corresponding countermeasures should be taken to reduce or eliminate these errors. This study provides theoretical guidance for the secure implementation of UD CV-QKD in real-world environments.
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Keywords:
- Continuous-Variable Quantum Key Distribution /
- Unidimensional Modulation /
- Source Errors /
- Realistic Security
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