Endo Mamoru, Sonoyama Tatsuki, Matsuyama Mikihisa, Okamoto Fumiya, Miki Shigehito, Yabuno Masahiro, China Fumihiro, Terai Hirotaka, Furusawa Akira
Opt Express. 2021 Apr 12;29(8):11728-11738. doi: 10.1364/OE.423142.
Superconducting nanostrip photon detectors have been used as single-photon detectors, which can discriminate only photons' presence or absence. It has recently been found that they can discriminate the number of photons by analyzing the output signal waveform, and they are expected to be used in various fields, especially in optical-quantum-information processing. Here, we improve the photon-number-resolving performance for light with a high-average photon number by pattern matching of the output signal waveform. Furthermore, we estimate the positive-operator-valued measure of the detector by a quantum detector tomography. The result shows that the device has photon-number-resolving performance up to five photons without any multiplexing or arraying, indicating that it is useful as a photon-number-resolving detector.
超导纳米带光子探测器已被用作单光子探测器，它只能分辨光子的有无。最近发现，它们可以通过分析输出信号波形来分辨光子数量，并且有望在各个领域得到应用，尤其是在光量子信息处理领域。在此，我们通过输出信号波形的模式匹配提高了对高平均光子数光的光子数分辨性能。此外，我们通过量子探测器断层扫描估计了探测器的正算符取值测量。结果表明，该器件在无需任何复用或阵列的情况下具有高达五个光子的光子数分辨性能，表明它可用作光子数分辨探测器。
