2024-03-29T10:47:19Z
https://kitami-it.repo.nii.ac.jp/oai
oai:kitami-it.repo.nii.ac.jp:00008681
2022-12-13T02:22:10Z
1:87
SNSPD with ultimate low system dark count rate using various cold filters
Shibata, Hiroyuki
Fukao, Kentaro
Kirigane , Naoto
Karimoto, Shinichi
Yamamoto, Hideki
Cold filter
Dark count rate
SNSPD
Superconducting photodetector
blackbody radiation
Suppressing the dark count rate (DCR) is one of the main issues in the development of the superconducting nanowire single-photon detector (SNSPD). Here we study the effect of suppressing DCR using the various optical bandpass filters cooled at 3 K. The DCR, which is dominated by the background blackbody radiation at room temperature through an optical fiber, can be strongly suppressed by introducing the cold filter. Using the bulk commercial filter with the bandwidth of 10 nm and the high transmission above 85 %, the DCR is improved about 29 dB with 2.4 dB decreasing of the system detection efficiency (η). The noise equivalent power (NEP) reaches 1.5 × 10-18 and the figure of merit (FOM) reaches 1.8 × 109. These values are compared to the results using other type of filters.
journal article
IEEE
2016-11
application/pdf
IEEE Transactions on Applied Superconductivity
4
27
2200504
1051-8223
https://kitami-it.repo.nii.ac.jp/record/8681/files/SNSPD with ultimate low system dark count rate using various cold filters.pdf
eng
https://doi.org/10.1109/TASC.2016.2631947
https://doi.org/10.1109/TASC.2016.2631947
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open access