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
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Takesue Hiroki
Ntt Basic Research Laboratories Ntt Corporation
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Shimizu Kaoru
Ntt Basic Research Laboratories Ntt Corporation
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SHIBATA Hiroyuki
NTT Basic Research Laboraiories
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Tokura Yasuhiro
Ntt Bacic Research Laboratories Ntt Corporation
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Shibata Hiroyuki
NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan
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