• Photonics Research
  • Vol. 9, Issue 6, 958 (2021)
Guang-Zhao Xu1、2、3、†, Wei-Jun Zhang1、2、3、4、†,*, Li-Xing You1、2、3、5、*, Jia-Min Xiong1、2、3, Xing-Qu Sun1、2、3, Hao Huang1、3, Xin Ou1、3, Yi-Ming Pan1、2、3, Chao-Lin Lv1、3, Hao Li1、3, Zhen Wang1、3, and Xiao-Ming Xie1、3
Author Affiliations
  • 1State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences (CAS), Shanghai 200050, China
  • 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3CAS Center for Excellence in Superconducting Electronics, Shanghai 200050, China
  • 4e-mail: zhangweijun@mail.sim.ac.cn
  • 5e-mail: lxyou@mail.sim.ac.cn
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    DOI: 10.1364/PRJ.419514 Cite this Article
    Guang-Zhao Xu, Wei-Jun Zhang, Li-Xing You, Jia-Min Xiong, Xing-Qu Sun, Hao Huang, Xin Ou, Yi-Ming Pan, Chao-Lin Lv, Hao Li, Zhen Wang, Xiao-Ming Xie. Superconducting microstrip single-photon detector with system detection efficiency over 90% at 1550 nm[J]. Photonics Research, 2021, 9(6): 958 Copy Citation Text show less

    Abstract

    Generally, a superconducting nanowire single-photon detector (SNSPD) is composed of wires with a typical width of 100 nm. Recent studies have found that superconducting strips with a micrometer-scale width can also detect single photons. Compared with the SNSPD covering the same area, the superconducting microstrip single-photon detector (SMSPD) has smaller kinetic inductance, higher working current, and lower requirements in fabrication accuracy, providing potential applications in the development of ultralarge active area detectors. However, the study of SMSPD is still in its infancy, and the realization of its high-performance and practical use remains an open question. This study demonstrates a NbN SMSPD with a nearly saturated system detection efficiency (SDE) of 92.2% at a dark count rate of 200 cps, a polarization sensitivity of 1.03, and a minimum timing jitter of 48 ps at the telecom wavelength of 1550 nm when coupled with a single-mode fiber and operated at 0.84 K. Furthermore, the detector’s SDE is over 70% when operated at a 2.1 K closed-cycle cryocooler.

    1. INTRODUCTION

    Superconducting nanowire single-photon detectors (SNSPDs) [1] have been proven as one of the most attractive single-photon detectors, as they provide high system detection efficiency (SDE) [25], low dark count rate (DCR) [6], low timing jitter (TJ) [7,8], high photon count rate (PCR) [9], and broadband sensitivity [10,11]. To date, SNSPDs have been used in many applications, such as quantum key distribution [12,13], photonic Boson sampling [14], dark matter detection [15,16], and satellite laser ranging and detection (LIDAR) [17].

    Guang-Zhao Xu, Wei-Jun Zhang, Li-Xing You, Jia-Min Xiong, Xing-Qu Sun, Hao Huang, Xin Ou, Yi-Ming Pan, Chao-Lin Lv, Hao Li, Zhen Wang, Xiao-Ming Xie. Superconducting microstrip single-photon detector with system detection efficiency over 90% at 1550 nm[J]. Photonics Research, 2021, 9(6): 958
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