Improving Continuous-Variable Quantum Key Distribution Using the Heralded Noiseless Linear Amplifier with Source in the Middle

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• 作者：Jianwu Liang ; Jian Zhou ; Jinjing Shi…
• 关键词：Continuous ; variable ; Quantum key distribution ; Noiseless linear amplifier ; Source in the middle
• 刊名：International Journal of Theoretical Physics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：55
• 期：2
• 页码：1156-1166
• 全文大小：430 KB
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• 作者单位：Jianwu Liang (1)
  Jian Zhou (1)
  Jinjing Shi (1)
  Guangqiang He (2)
  Ying Guo (1)
  
  1. School of Information Science & Engineering, Central South University, Changsha, 410083, China
  2. State Key Lab of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai, 200030, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Physics
  Quantum Physics
  Elementary Particles and Quantum Field Theory
  Mathematical and Computational Physics
  
• 出版者：Springer Netherlands
• ISSN：1572-9575

文摘

We characterize the efficiency of the practical continuous-variable quantum key distribution (CVQKD) while inserting the heralded noiseless linear amplifier (NLA) before detectors to increase the secret key rate and the maximum transmission distance in Gaussian channels. In the heralded NLA-based CVQKD system, the entanglement source is only placed in the middle while the two participants are unnecessary to trust their source. The intensities of source noise are sensitive to the tunable NLA with the parameter g in a suitable range and can be stabilized to the suitable constant values to eliminate the impact of channel noise and defeat the potential attacks. Simulation results show that there is a well balance between the secret key rate and the maximum transmission distance with the tunable NLA.