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

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

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 μm, we suppressed the DCR of a superconducting nanowire single-photon detector by more than three ord...

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Veröffentlicht in:Optics letters 2015-07, Vol.40 (14), p.3428-3431
Hauptverfasser: Shibata, Hiroyuki, Shimizu, Kaoru, Takesue, Hiroki, Tokura, Yasuhiro
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container_issue 14
container_start_page 3428
container_title Optics letters
container_volume 40
creator Shibata, Hiroyuki
Shimizu, Kaoru
Takesue, Hiroki
Tokura, Yasuhiro
description 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 μm, 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 2.7×10(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 1.8×10(12).
doi_str_mv 10.1364/ol.40.003428
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