International Journal of Theoretical Physics

, Volume 55, Issue 2, pp 1156–1166 | Cite as

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

  • Jianwu Liang
  • Jian Zhou
  • Jinjing Shi
  • Guangqiang He
  • Ying Guo
Article
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Accepted:
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Abstract

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.

Keywords

Continuous-variable Quantum key distribution Noiseless linear amplifier Source in the middle 
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Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 61272495, 61379153, 61401519), the Research Fund for the Doctoral Program of Higher Education of China (Grant Nos. 20130162110012), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-11-0510).

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Jianwu Liang
    • 1
  • Jian Zhou
    • 1
  • Jinjing Shi
    • 1
  • Guangqiang He
    • 2
  • Ying Guo
    • 1
  1. 1.School of Information Science & EngineeringCentral South UniversityChangshaChina
  2. 2.State Key Lab of Advanced Optical Communication Systems and Networks, Department of Electronic EngineeringShanghai Jiaotong UniversityShanghaiChina

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