Novel photon detection technologies for quantum communications

M. Sasaki, A. Tanaka, M. Fujiwara, K. Yoshino, S. Takahashi, Y. Nambu, A. Tomita, A. Tajima, S. Miki, T. Yamashita, H. Terai, Z. Wang, K. Tsujino, D. Fukuda, M. Takeoka

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We present the latest results on two kinds of photon detectors: single photon detectors (SPDs) and photon number resolving detector (PNRD). We developed high speed and low noise SPDs using superconducting nano-wire (abbreviated by SNSPD) and semiconductor (InGaAs) avalanche photodiode (APD). The SNSPD system has totally four channels all of which have the detection eciency higher than 16% at 100Hz dark count rate. The InGaAs APD system also has four channels and the best performance is represented by the after-pulse probability of 0.61%, the dark count probability of 0.71×10-6 (∼1kHz), and the detection eciency of 10.9%. Both systems were applied to wavelength division multiplexing quantum key distribution (WDM-QKD) operated at 1.2GHz repetition rate in a eld environment. The PNRD is made of superconducting transition edge sensor. It was applied to the implementation of quantum receiver which could beat the homodyne limit of the bit error rate of binary coherent states. We discuss future perspective of quantum communications with those photon detection technologies, including multi-user QKD networks and low-power high capacity communications.

Original languageEnglish
Title of host publicationAdvanced Photon Counting Techniques VI
Publication statusPublished - 2012
Externally publishedYes
EventAdvanced Photon Counting Techniques VI - Baltimore, MD, United States
Duration: 2012 Apr 252012 Apr 26

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceAdvanced Photon Counting Techniques VI
Country/TerritoryUnited States
CityBaltimore, MD

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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