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QKD system with fast active optical path length compensation

  • Byung Kwon Park
  • Min Soo Lee
  • Min Ki Woo
  • Yong-Su Kim
  • Sang-Wook Han
  • Sung Moon
Article

Abstract

We develop a quantum key distribution (QKD) system with fast active optical path length compensation. A rapid and reliable active optical path length compensation scheme is proposed and applied to a plug-and-play QKD system. The system monitors changes in key rates and controls it is own operation automatically. The system achieves its optimal performance within three seconds of operation, which includes a sifted key rate of 5.5 kbps and a quantum bit error rate of less than 2% after an abrupt temperature variation along the 25 km quantum channel. The system also operates well over a 24 h period while completing more than 60 active optical path length compensations.

Keywords

quantum key distribution optical path length compensation plug and play field programmable gate array 

PACS number(s)

03.67.Dd 03.67.Hk 07.05.Dz 07.50.Ek 

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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Byung Kwon Park
    • 1
    • 2
  • Min Soo Lee
    • 1
    • 2
  • Min Ki Woo
    • 1
  • Yong-Su Kim
    • 1
  • Sang-Wook Han
    • 1
  • Sung Moon
    • 1
  1. 1.Center for Quantum InformationKorea Institute of Science and TechnologySeoulKorea
  2. 2.Department of Nano-materials, Science and EngineeringKorea University of Science and TechnologyDaejeonKorea

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