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Chin. Phys. B, 2019, Vol. 28(4): 040303    DOI: 10.1088/1674-1056/28/4/040303
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Research on co-propagation of QKD and classical communication by reducing the classical optical power

Ru-Shi He(何如适)1,2, Mu-Sheng Jiang(江木生)1,2, Yang Wang(汪洋)1,2, Ya-Hui Gan(甘亚辉)1,2, Chun Zhou(周淳)1,2, Wan-Su Bao(鲍皖苏)1,2
1 Henan Key Laboratory of Quantum Information and Cryptography, Zhengzhou Information Science and Technology Institute, Zhengzhou 450001, China;
2 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China

We investigate the crosstalk noise, especially the spontaneous Raman scattering, in the optical fiber of a co-propagation system between quantum key distribution (QKD) and classical communications. Although many methods have been proposed, such as increasing the wavelength spacing and narrowband filtering technique, to suppress Raman scattering noise, these methods greatly affect the performance of QKD. One way to solve the obstacle restricting the coexistence is to decrease the classical signal power. Based on the high gain of the gated avalanche photodiode and pulse position modulation, we demonstrate that the co-propagation system works effectively with only a small effect on long-haul fibers, which has great significance for the practical widespread commercialization of QKD.

Keywords:  QKD      co-propagation      spontaneous Raman scattering      gated APD      modulation formats  
Received:  15 October 2018      Revised:  15 January 2019      Published:  05 April 2019
PACS:  03.67.Dd (Quantum cryptography and communication security)  
  03.67.Hk (Quantum communication)  
  42.50.Ex (Optical implementations of quantum information processing and transfer)  

Project supported by the National Natural Science Foundation of China (Grant Nos. 61605248 and 61505261).

Corresponding Authors:  Mu-Sheng Jiang, Wan-Su Bao     E-mail:;

Cite this article: 

Ru-Shi He(何如适), Mu-Sheng Jiang(江木生), Yang Wang(汪洋), Ya-Hui Gan(甘亚辉), Chun Zhou(周淳), Wan-Su Bao(鲍皖苏) Research on co-propagation of QKD and classical communication by reducing the classical optical power 2019 Chin. Phys. B 28 040303

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