无光子计数器的光子数鉴别及其在重建非高斯态中的应用
Photon number discrimination without a photon counter and its application to reconstructing non-Gaussian states
摘要：
条件光子计数测量的非线性可用于“去高斯化"光的高斯态。在这里，我们提出并实验证明了光子数分辨率的技术，仅使用零差检测。然后，我们应用这种技术来通知有条件的测量，明确重建非高斯的一个和两个光子减去压缩真空态的统计。虽然我们的光子数测量依赖于系综平均值，不能用于制备非高斯态的光，其高效率，光子数分辨能力，并与电信频带的兼容性，使其适合于依赖于平均值的结果的量子信息任务。
英文摘要：
The non-linearity of a conditional photon-counting measurement can be used to `de-Gaussify' a Gaussian state of light. Here we present and experimentally demonstrate a technique for photon number resolution using only homodyne detection. We then apply this technique to inform a conditional measurement; unambiguously reconstructing the statistics of the non-Gaussian one and two photon subtracted squeezed vacuum states. Although our photon number measurement relies on ensemble averages and cannot be used to prepare non-Gaussian states of light, its high efficiency, photon number resolving capabilities, and compatibility with the telecommunications band make it suitable for quantum information tasks relying on the outcomes of mean values.
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