Ultimate low system dark-count rate for superconducting nanowire single-photon detector

被引：115
|
作者：
Shibata, Hiroyuki [1 ]
Shimizu, Kaoru [2 ]
Takesue, Hiroki [2 ]
Tokura, Yasuhiro [2 ]
机构：
[1] Kitami Inst Technol, Dept Elect & Elect Engn, Kitami, Hokkaido 0908507, Japan
[2] NTT Corp, NTT Basic Res Labs, Atsugi, Kanagawa 2430198, Japan
来源：
OPTICS LETTERS | 2015年 / 40卷 / 14期
关键词：
QUANTUM KEY DISTRIBUTION; EFFICIENCY;
D O I：
10.1364/OL.40.003428
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The dark-count rate (DCR) is a key parameter of single-photon detectors. By introducing a bulk optical band-pass filter mounted on a fiber-to-fiber optical bench cooled at 3 K and blocking down to 5 mu m, we suppressed the DCR of a superconducting nanowire single-photon detector by more than three orders of magnitude. The DCR is limited by the blackbody radiation through a signal passband of 20-nm bandwidth. The figure of merit, system detection efficiency, and DCR were 2.7 x 10(11), 2.3%, and 10(-3) Hz, respectively. Narrowing the bandwidth to 100 GHz suppresses the DCR to 10(-4) Hz, and the figure of merit increases to 1.8 x 10(12). (C) 2015 Optical Society of America
引用
收藏
页码：3428 / 3431
页数：4
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