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Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation |
| Yingming Zhou(周颖明)1, Xue-Qin Jiang(蒋学芹)3, Weiqi Liu(刘维琪)2, Tao Wang(王涛)1, Peng Huang(黄鹏)1, Guihua Zeng(曾贵华)1,3 |
1 State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Key Laboratory on Navigation and Location-based Service, and Center of Quantum Information Sensing and Processing(QSIP), Shanghai Jiao Tong University, Shanghai 200240, China;
2 College of Information Science and Technology, Northwest University, Xi'an 710127, China;
3 School of Information Science and Technology, Donghua University, Shanghai 201620, China |
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Abstract The well-known multi-dimensional reconciliation is an effective method used in the continuous-variable quantum key distribution in the long-distance and the low signal-to-noise-ratio scenarios. The virtual channel employed to exchange data is generally established by using a finite-dimensional rotation in the reconciliation procedure. In this paper, we found that the finite dimension of the multi-dimensional reconciliation inevitably leads to the mismatch of the signal-to-noise-ratio between the quantum channel and the virtual channel, which may be called the finite-dimension effect. Such an effect results in an overestimation on the secret key rate, and subsequently induces vital practical security loopholes.
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Received: 15 January 2018
Revised: 10 February 2018
Accepted manuscript online:
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PACS:
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03.67.Hk
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(Quantum communication)
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03.67.-a
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(Quantum information)
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03.67.Dd
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(Quantum cryptography and communication security)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.61332019,61671287,and 61631014) and the National Key Research and Development Program of China (Grant No.2016YFA0302600). |
Corresponding Authors:
Peng Huang, Guihua Zeng
E-mail: huang.peng@sjtu.edu.cn;ghzeng@sjtu.edu.cn
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Cite this article:
Yingming Zhou(周颖明), Xue-Qin Jiang(蒋学芹), Weiqi Liu(刘维琪), Tao Wang(王涛), Peng Huang(黄鹏), Guihua Zeng(曾贵华) Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation 2018 Chin. Phys. B 27 050301
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