Figure 2 | Characterization of the on-chip single-photon detection efficiency (IMAGE)
Caption
Figure 2 | Characterization of the on-chip single-photon detection efficiency. Panels (a) and (b) display the photon counts as a function of bias current for detectors D1 and D2, respectively. Clear saturation behavior is observed, indicating that the intrinsic quantum efficiency of the nanowires approaches 100%. Panels (c) and (d) present the count rate histograms for detectors D1 and D2, respectively (TCR: total count rate; DCR: dark count rate; PCR: photon count rate, given by their difference). Since D2 is positioned after D1 and primarily absorbs and detects photons missed by D1, its count rate is significantly lower than that of D1. By calculating the ratio between the two, further analysis reveals that the individual detector efficiency reaches 97.81%, while the joint detection efficiency of the cascaded system achieves up to 99.73%.
Credit
Li, ZG., Mao, J., Zhou, YJ. et al
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CC BY