Quantum key distribution over a 72 dB channel loss using ultralow dark count superconducting single-photon detectors

We report the first quantum key distribution (QKD) experiment over a 72 dB channel loss using superconducting nanowire single-photon detectors (SSPD, SNSPD) with the dark count rate (DCR) of 0.01 cps. The DCR of the SSPD, which is dominated by the blackbody radiation at room temperature, is blocked...

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Veröffentlicht in:Optics letters 2014-09, Vol.39 (17), p.5078-5081
Hauptverfasser: Shibata, Hiroyuki, Honjo, Toshimori, Shimizu, Kaoru
Format: Artikel
Sprache:eng
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Zusammenfassung:We report the first quantum key distribution (QKD) experiment over a 72 dB channel loss using superconducting nanowire single-photon detectors (SSPD, SNSPD) with the dark count rate (DCR) of 0.01 cps. The DCR of the SSPD, which is dominated by the blackbody radiation at room temperature, is blocked by introducing cold optical bandpass filter. We employ the differential phase shift QKD (DPS-QKD) scheme with a 1 GHz system clock rate. The quantum bit error rate (QBER) below 3% is achieved when the length of the dispersion shifted fiber (DSF) is 336 km (72 dB loss), which is low enough to generate secure keys.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.39.005078