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首页> 外文期刊>Applied Superconductivity, IEEE Transactions on >Performances of Fiber-Coupled Superconducting Nanowire Single-Photon Detectors Measured at Ultralow Temperature
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Performances of Fiber-Coupled Superconducting Nanowire Single-Photon Detectors Measured at Ultralow Temperature

机译：超低温度下光纤耦合的超导纳米线单光子探测器的性能

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摘要

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 $20 mu{rm m}times 20 mu{rm m}$. 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.
机译：我们报告了光纤耦合超导纳米线单光子检测器（SNSPD）从4 K下降到1550 nm波长的16mK超低温度的性能。系统检测效率（DE）随着温度降低而提高，即使在没有光腔结构的情况下，在1.5 K以下的暗计数率也低于15 cps，达到了15％的很高值。我们还观察到系统DE的偏置电流依存性为16 mK，这表明我们的SNSPD的设备DE几乎达到了固有DE，尽管该设备的有效面积为$ 20 mu {rm m}乘以20 mu {rm m} $。即使在16 mK时，暗数仍然是有限的，黑体辐射成为其低温下光纤耦合设备的主要来源。

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