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This advancement demonstrates how replacing electrical bias with an integrated cryogenic photodiode significantly reduces dark counts in superconducting nanowire single-photon detectors (SNSPDs). By achieving a rate of 1e-4 counts per second, this optical biasing method enhances signal fidelity for critical quantum applications like secure communication and high-sensitivity imaging. The technique offers a viable pathway to build more sensitive photonic devices without introducing the noise typically associated with external electrical connections.
Detectors Block Stray Photons and Achieve Ultra-Low Dark Counts of One in Ten Thousand
A single-photon detector now achieves 80. 7% efficiency with a dark count rate of 32. 6 counts per second, mirroring the performance of established electrical biasing methods.
Superconducting nanowire single-photon detectors (SNSPDs) now utilise an improved optical biasing scheme, employing a cryogenic InGaAs-InP photodiode as a local bias source and achieving an ultra-low intrinsic dark count rate of 1e-4 counts per second. Jia-Hao Hu and colleagues at the University of Chinese Academy of Sciences have devised a technique for powering single-photon detectors, devices that identify individual light particles. The method uses light to provide a bias current, sharply reducing unwanted false detections known as dark counts to levels comparable with existing electrical methods. This provides a…
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Subiecte conexe
Improved Cryogenic Photodiode Optical Biasing for Low-Noise and Low-Jitter Superconducting Nanowire Single-Photon Detectors
arXiv · 16 iun. 2026
Improved Cryogenic Photodiode Optical Biasing for Low-Noise and Low-Jitter Superconducting Nanowire Single-Photon Detectors
arXiv · 8 iun. 2026
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