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arXiv 1402.4526cond-mat.supr-con
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非晶Mo0.75 Ge 0.25薄膜超导纳米线单光子探测器

Superconducting nanowire single photon detectors fabricated from an amorphous Mo0.75Ge0.25 thin film

V. B. Verma, A. E. Lita, M. R. Vissers, F. Marsili, D. P. Pappas, R. P. Mirin, S. W. Nam

摘要:

介绍了用非晶Mo_(0.75)Ge_(0.25)薄膜制备的超导纳米线单光子探测器的特性。制造的设备显示出饱和的内部检测效率在低于1 K的温度下,与系统暗计数率低于每秒500计数。在Gifford-McMahon(GM)低温制冷机在2.5 K的操作是可能的,系统检测效率(SNR)超过20%的SNSPD尚未优化的高检测效率。

英文摘要:

We present the characteristics of superconducting nanowire single photon detectors (SNSPDs) fabricated from amorphous Mo0.75Ge0.25 thin-films. Fabricated devices show a saturation of the internal detection efficiency at temperatures below 1 K, with system dark count rates below 500 counts per second. Operation in a Gifford-McMahon (GM) cryocooler at 2.5 K is possible with system detection efficiencies (SDE) exceeding 20% for SNSPDs which have not been optimized for high detection efficiency.

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