论文标题
2x2多像素的超导纳米线单光子检测器的量子检测器层析成像
Quantum detector tomography of a 2x2 multi-pixel array of superconducting nanowire single photon detectors
论文作者
论文摘要
我们展示了超导纳米线单光子检测器的商业2x2阵列的量子检测器断层扫描。我们表明，可以直接提取效果，包括效率，深度计数和跨言论概率，而无需求助于基础检测器物理学，包括效率，深度计数和交叉对话概率。这些功绩数字直接从设备的重建正算子估值（POVM）的四个要素中直接识别。我们表明，检测器断层扫描提取的效率和深度计数概率的值与对这些数量的独立测量非常吻合，并且我们为跨词概率提供了直观的操作定义。最后，我们表明必须仔细选择重建所需的参数，以避免对数据进行过度厚度。
We demonstrate quantum detector tomography of a commercial 2x2 array of superconducting nanowire single photon detectors. We show that detector-specific figures of merit including efficiency, dark-count and cross-talk probabilities can be directly extracted, without recourse to the underlying detector physics. These figures of merit are directly identified from just four elements of the reconstructed positive operator valued measure (POVM) of the device. We show that the values for efficiency and dark-count probability extracted by detector tomography show excellent agreement with independent measurements of these quantities, and we provide an intuitive operational definition for cross-talk probability. Finally, we show that parameters required for the reconstruction must be carefully chosen to avoid oversmoothing the data.
