Security Analysis of a Passive Continuous-Variable Quantum Key Distribution by Considering Finite-Size Effect |
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Authors: | Shengjie Xu Yin Li Yijun Wang Yun Mao Xiaodong Wu Ying Guo |
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Affiliation: | 1.School of Automation, Central South University, Changsha 410083, China; (S.X.); (Y.L.); (Y.W.);2.School of Economics and Mangement, Beihua University, Jilin 132013, China |
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Abstract: | We perform security analysis of a passive continuous-variable quantum key distribution (CV-QKD) protocol by considering the finite-size effect. In the passive CV-QKD scheme, Alice utilizes thermal sources to passively make preparation of quantum state without Gaussian modulations. With this technique, the quantum states can be prepared precisely to match the high transmission rate. Here, both asymptotic regime and finite-size regime are considered to make a comparison. In the finite-size scenario, we illustrate the passive CV-QKD protocol against collective attacks. Simulation results show that the performance of passive CV-QKD protocol in the finite-size case is more pessimistic than that achieved in the asymptotic case, which indicates that the finite-size effect has a great influence on the performance of the single-mode passive CV-QKD protocol. However, we can still obtain a reasonable performance in the finite-size regime by enhancing the average photon number of the thermal state. |
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Keywords: | passive continuous-variable quantum key distribution finite-size effect |
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