基于环路探测器特征的光统计重建
Photostatistics Reconstruction via Loop Detector Signatures
摘要：
光子数分辨探测器是光量子信息处理协议的基本组成部分。结合适当的统计处理，环路探测器可用于将二进制开/关光子计数器转换为光子数分辨探测器。在这里，我们描述的光子计数的签名的想法，这可能是用来更鲁棒地重建的量子态的光子数分布。该方法被实验应用在一个9端口环路检测器在电信波长工作，并直接比较的方法，从而只有光子计数的数量被用来重建的输入分布。签名的方法被证明是更强大的对校准误差，表现出减少统计不确定性，并减少依赖于先验假设的输入状态。
英文摘要：
Photon-number resolving detectors are a fundamental building-block of optical quantum information processing protocols. A loop detector, combined with appropriate statistical processing, can be used to convert a binary on/off photon counter into a photon-number-resolving detector. Here we describe the idea of a signature of photon-counts, which may be used to more robustly reconstruct the photon number distribution of a quantum state. The methodology is applied experimentally in a 9-port loop detector operating at a telecommunications wavelength and compared directly to the approach whereby only the number of photon-counts is used to reconstruct the input distribution. The signature approach is shown to be more robust against calibration errors, exhibit reduced statistical uncertainty, and reduced reliance on a-priori assumptions about the input state.
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