论文标题
多模式高斯州分析，总光子计数
Multi-mode Gaussian State Analysis with Total Photon Counting
论文作者
论文摘要
光子数清分检测器的质量的持续提高为测量光量子状态提供了新的可能性。在这项工作中，我们考虑了一个任意多模高斯状态的特性的问题，由一个测量总光子数量的单个光子分辨检测器确定。在理想情况下，我们找到了这个问题的答案，在理想情况下，确切的光子数概率是已知的。我们表明，由总光子数分布确定的数量是协方差矩阵的频谱，协方差矩阵的每个特征空间中的绝对位移，也没有其他。对于纯高斯状态，频谱决定了挤压参数。
The continuing improvement in the qualities of photon-number-resolving detectors opens new possibilities for measuring quantum states of light. In this work we consider the question of what properties of an arbitrary multimode Gaussian state are determined by a single photon-number-resolving detector that measures total photon number. We find an answer to this question in the ideal case where the exact photon-number probabilities are known. We show that the quantities determined by the total photon number distribution are the spectrum of the covariance matrix, the absolute displacement in each eigenspace of the covariance matrix, and nothing else. In the case of pure Gaussian states, the spectrum determines the squeezing parameters.
