Superconducting Nanowire Single-Photon Detector with Ultralow Dark Count Rate Using Cold Optical Filters

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概要

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• We report the fabrication of a superconducting nanowire single-photon detector (SSPD or SNSPD) with an ultralow dark count rate. By introducing optical band-pass filters at the input of the SSPD and cooling the filters at 3 K, the dark count rate is reduced to less than 1/100 at low bias. An SSPD with 0.1 cps dark count rate and 5.6% system detection efficiency at 1550 nm wavelength is obtained. We show that a quantum key distribution (QKD) over 300 km of fiber is possible based on a numerical calculation assuming a differential phase shift QKD protocol implemented with our SSPDs.

• 2013-07-25

著者

• Takesue Hiroki

  Ntt Basic Research Laboratories Ntt Corporation

• Shimizu Kaoru

  Ntt Basic Research Laboratories Ntt Corporation

• SHIBATA Hiroyuki

  NTT Basic Research Laboraiories

• Tokura Yasuhiro

  Ntt Bacic Research Laboratories Ntt Corporation

• Shibata Hiroyuki

  NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan

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