论文标题
使用光子数测量值定量两光束高斯状态中的量子相关性
Quantification of Quantum Correlations in Two-Beam Gaussian States Using Photon-Number Measurements
论文作者
论文摘要
识别和随后的量子相关性量化对于理解，控制和工程量子设备和过程至关重要。我们得出并实施了一种通用方法，仅使用直至第四阶的实验强度力矩来量化各种形式的量子相关性。这是可能的，因为这些时刻可以准确确定两光束高斯田地的全球和边缘杂质。这导致了否定性的指导，紧密下限和上限的确定，以及用作状态不可分割性的量化器的kullback-leibler差异。使用强度力矩也确定了主要的挤压方差。该方法在实验双束上以增加强度和由光子对组成的挤压超高斯束进行了证明。我们的方法很容易适用于多层高斯字段，以表征其量子相关性。
Identification, and subsequent quantification of quantum correlations, is critical for understanding, controlling, and engineering quantum devices and processes. We derive and implement a general method to quantify various forms of quantum correlations using solely the experimental intensity moments up to the fourth order. This is possible as these moments allow for an exact determination of the global and marginal impurities of two-beam Gaussian fields. This leads to the determination of steering, tight lower and upper bounds for the negativity, and the Kullback-Leibler divergence used as a quantifier of state nonseparability. The principal squeezing variances are determined as well using the intensity moments. The approach is demonstrated on the experimental twin beams with increasing intensity and the squeezed super-Gaussian beams composed of photon pairs. Our method is readily applicable to multibeam Gaussian fields to characterize their quantum correlations.
