Improving Continuous-Variable Quantum Key Distribution in a Turbulent Atmospheric Channel via Photon Subtraction

  • Qingquan Peng
  • Qin LiaoEmail author
  • Ying Guo


The transmission performance of continuous-variable quantum key distribution (CVQKD) in turbulent atmospheric channel is lower than CVQKD in fiber channel due to the large loss of quantum entanglement in turbulent atmospheric channel. In this paper, we propose a new approach to prolong the transmission performance of CVQKD in a turbulent atmospheric channel by using photon subtraction operation since the proposed approach can effectively enhance the entangled state between quantum. Simulation analysis shows that photon subtraction operation can effectively improve the security key rate of continuous-variable quantum key distribution, and the optimal performance can be achieved when only one photon is subtracted.


Continuous variable quantum key distribution Photon subtraction operation A turbulent atmospheric channel 



This work was supported by the National Natural Science Foundation of China (Grant Nos. 61572529, 61871407, 61872390, 61801522), and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 18KJB510045).


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of AutomationCentral South UniversityChangshaChina
  2. 2.College of Computer Science and Electronic EngineeringHunan UniversityChangshaChina
  3. 3.Jiangsu Key Construction Laboratory of IoT Application TechnologyWuxi Taihu UniversityWuxiChina

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