Afterpulse-like phenomenon of superconducting single photon detector in high speed quantum key distribution system

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Abstract

We discuss our estimates of the performance of a superconducting single photon detector (SSPD) in a high speed quantum key distribution (QKD) system. We find that at high repetition operation reflections from the readout circuit at room temperature causes an afterpulse-like phenomenon, and drastically increases the quantum bit error rate (QBER). Such effects are not seen during low frequency operation. By using an amplifier with a small reflection coefficient S11, we succeed in reducing the afterpulse-like phenomenon and increasing a secure key rate.

Journal

Optics Express  

Optics Express 19(20), 19562-19571, 2011-09-26 

Optical Society of America

Codes

  • NII Article ID (NAID) :
    120003504731
  • Text Lang :
    ENG
  • Article Type :
    Journal Article
  • ISSN :
    1094-4087
  • Databases :
    IR 

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