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

研究成果: Conference 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.

ホスト出版物のタイトルAdvanced Photon Counting Techniques VI
出版ステータスPublished - 2012
イベントAdvanced Photon Counting Techniques VI - Baltimore, MD, United States
継続期間: 2012 4月 252012 4月 26


名前Proceedings of SPIE - The International Society for Optical Engineering


ConferenceAdvanced Photon Counting Techniques VI
国/地域United States
CityBaltimore, MD

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学


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