1. Performances of Fiber-Coupled Superconducting Nanowire Single-Photon Detectors Measured at Ultralow Temperature.
- Author
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Yamashita, T., Miki, S., Qiu, W., Fujiwara, M., Sasaki, M., and Wang, Z.
- Subjects
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PERFORMANCE evaluation , *PHOTON detectors , *TEMPERATURE measurements , *NANOWIRES , *MICROWAVE devices , *SUPERCONDUCTING magnets , *THIN films - Abstract
We report on the performance of a fiber-coupled superconducting nanowire single-photon detector (SNSPD) from 4 K down to the ultralow temperature of 16 mK for a 1550 nm wavelength. The system detection efficiency (DE) increased with decreasing the temperature and reached the considerably high value of 15% with a dark count rate less than 100 cps below 1.5 K, even without an optical cavity structure. We also observed saturation of the system DE in its bias current dependency at 16 mK, which indicates that the device DE of our SNSPD nearly reached intrinsic DE despite the device having a large active area of 20\ \mum\times 20\ \mum. The dark count was finite even at 16 mK and the black body radiation becomes its dominant origin in the low temperatures for fiber-coupled devices. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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