Photon number resolvability of multi-pixel superconducting nanowire single photon detectors using a single flux quantum circuit  

作　　者：Hou-Rong Zhou Kun-Jie Cheng Jie Ren Li-Xing You Li-Liang Ying Xiao-Yan Yang Hao Li Zhen Wang 周后荣;程昆杰;任洁;尤立星;应利良;杨晓燕;李浩;王镇(State Key Laboratory of Functional Material for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;CAS Center for Excellence in Superconducting Electronics,Shanghai 200050,China)

机构地区：[1]State Key Laboratory of Functional Material for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]CAS Center for Excellence in Superconducting Electronics,Shanghai 200050,China

出　　处：《Chinese Physics B》2022年第5期636-640,共5页中国物理B（英文版）

基　　金：supported by the National Key R&D Program of China (Grant No. 2017YFA0304000);the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA18000000);the Science and Technology Commission of Shanghai Municipality, China (Grant No. 18511110200)。

摘　　要：Superconducting nanowire single-photon detectors(SNSPDs) are typical switching devices capable of detecting single photons with almost 100% detection efficiency. However, they cannot determine the exact number of incident photons during a detection event. Multi-pixel SNSPDs employing multiple read-out channels can provide photon number resolvability(PNR), but they require increased cooling power and costly multi-channel electronic systems. In this work, a single-flux quantum(SFQ) circuit is employed, and PNR based on multi-pixel SNSPDs is successfully demonstrated. A multi-input magnetically coupled DC/SFQ converter(MMD2 Q) circuit with a mutual inductance M is used to combine and record signals from a multi-pixel SNSPD device. The designed circuit is capable of discriminating the amplitude of the combined signals in accuracy of Φ_(0)/M with Φ_(0) being a single magnetic flux quantum. By employing the MMD2 Q circuit,the discrimination of up to 40 photons can be simulated. A 4-parallel-input MMD2 Q circuit is fabricated, and a PNR of3 is successfully demonstrated for an SNSPD array with one channel reserved for the functional verification. The results confirm that an MMD2 Q circuit is an effective tool for implementing PNR with multi-pixel SNSPDs.

关 键 词：superconducting nanowire single-flux quantum circuit photon number resolution 

分 类 号：O413[理学—理论物理] O572.212[理学—物理]