论文标题
在光相估计中挤压作为抵消相扩散的资源
Squeezing as a resource to counteract phase diffusion in optical phase estimation
论文作者
论文摘要
在存在非高斯相噪声的情况下，我们使用高斯状态解决了相位估计方案。与先前的分析不同，我们分析了在编码相位信息之前发生噪声的情况。特别是，我们研究了在相扩散之前或之后如何可以利用挤压挤压。我们的结果表明，噪声后挤压探针大大提高了估计方案的敏感性，如量子渔民信息的增加所见。然后，我们考虑在测量阶段采用同伴检测的现实设置，并在两种不同的情况下解决其最佳性及其性能。
We address a phase estimation scheme using Gaussian states in the presence of non-Gaussian phase noise. At variance with previous analysis, we analyze situations in which the noise occurs before encoding phase information. In particular, we study how squeezing may be profitably used before or after phase diffusion. Our results show that squeezing the probe after the noise greatly enhances the sensitivity of the estimation scheme, as witnessed by the increase of the quantum Fisher information. We then consider a realistic setup where homodyne detection is employed at the measurement stage, and address its optimality as well as its performance in the two different scenarios.
