Zhou, Z.; Zou, S.; Mao, Y.; Huang, T.; Guo, Y. Discrete Modulation Source Enhancement for Continuous Variable Quantum Key Distribution through Photon Catalyzing. Preprints2020, 2020090224. https://doi.org/10.20944/preprints202009.0224.v1
Zhou, Z., Zou, S., Mao, Y., Huang, T., & Guo, Y. (2020). Discrete Modulation Source Enhancement for Continuous Variable Quantum Key Distribution through Photon Catalyzing. Preprints. https://doi.org/10.20944/preprints202009.0224.v1
Zhou, Z., Tongcheng Huang and Ying Guo. 2020 "Discrete Modulation Source Enhancement for Continuous Variable Quantum Key Distribution through Photon Catalyzing" Preprints. https://doi.org/10.20944/preprints202009.0224.v1
Establishing global high-rate secure communications is a potential application of continuous-variable quantum key distribution (CVQKD) but also challenging for long-distance transmissions in metropolitan areas. The discrete modulation(DM) can make up for the shortage of transmission distance that has a unique advantage against all side-channel attacks, however its further performance improvement requires source preparation in the presence of noise and loss. Here, we consider the effects of photon catalysis (PC) on the DM-involved source preparation for lengthening the maximal transmission distance of the CVQKD system. We address a zero-photon catalysis (ZPC)-based source preparation for enhancing the DM-CVQKD system. The statistical fluctuation due to the finite length of data is taken into account for the practical security analysis. Numerical simulations show that the ZPC-based DM-CVQKD system can not only achieve the extended maximal transmission distance, but also contributes to the reasonable increase of the secret key rate. This approach enables the DM-CVQKD to tolerate lower reconciliation efficiency, which may promote the practical implementation solutions compatible with classical optical communications using state-of-the-art technology.
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