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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 20 — Sep. 26, 2011
  • pp: 19562–19571

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

M. Fujiwara, A. Tanaka, S. Takahashi, K. Yoshino, Y. Nambu, A. Tajima, S. Miki, T. Yamashita, Z. Wang, A. Tomita, and M. Sasaki  »View Author Affiliations


Optics Express, Vol. 19, Issue 20, pp. 19562-19571 (2011)
http://dx.doi.org/10.1364/OE.19.019562


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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.

© 2011 OSA

OCIS Codes
(030.5260) Coherence and statistical optics : Photon counting
(040.0040) Detectors : Detectors

ToC Category:
Detectors

History
Original Manuscript: July 26, 2011
Revised Manuscript: August 19, 2011
Manuscript Accepted: August 23, 2011
Published: September 22, 2011

Citation
M. Fujiwara, A. Tanaka, S. Takahashi, K. Yoshino, Y. Nambu, A. Tajima, S. Miki, T. Yamashita, Z. Wang, A. Tomita, and M. Sasaki, "Afterpulse-like phenomenon of superconducting single photon detector in high speed quantum key distribution system," Opt. Express 19, 19562-19571 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-20-19562


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