Photon-number-resolving single-photon detector with a system detection efficiency of 98% and photon-number resolution of 32

• URL: http://arxiv.org/abs/2504.02202v1
• Date: Thu, 03 Apr 2025 01:15:49 GMT
• Title: Photon-number-resolving single-photon detector with a system detection efficiency of 98% and photon-number resolution of 32
• Authors: Chaomeng Ding, Xingyu Zhang, Jiamin Xiong, You Xiao, Tianzhu Zhang, Jia Huang, Hongxin Xu, Xiaoyu Liu, Lixing You, Zhen Wang, Hao Li,
• Abstract summary: Single-photon system detection efficiency (SDE) of 98% at a dark count rate of 20 cps.<n> detector operates at a high count rate of 41 MHz at 3dB-SDE, with a low timing jitter of as low as 40 ps.
• Score: 28.64849638882728
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Efficiently distinguishing photon numbers is a crucial yet challenging technology for various quantum information and quantum metrology applications. While superconducting transition edge sensors offer good photon-number-resolving (PNR) capabilities, they are hampered by low detection speed, timing jitter, and complex cooling and readout requirements. In this work, we present a significant advancement toward achieving high-fidelity PNR single-photon detectors. The unique twin-layer configuration of superconducting nanowire atop a dielectric mirror ensures the near-unity detection efficiency. The segmented design enables spatial multiplexing, establishing a mapping relationship between pulse amplitude and registered photons. The fabricated detector exhibits impressive performance metrics, including a single-photon system detection efficiency (SDE) of ~ 98% at a dark count rate of 20 cps and photon-number resolution capability up to 32. Further characterization through detector tomography reveals high fidelities for two-, three-, and four-photon events, approximately 87%,73%, and 40% respectively. Moreover, the detector operates at a high count rate of 41 MHz at 3dB-SDE, with a low timing jitter of as low as 40 ps. With its near-unity efficiency, high photon-number resolution, low dark count rate and fast detection speed, we expect significant interest in these detectors, promising substantial benefits for weak light detection and optical quantum information applications.

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