论文标题
玻色子采样灵感策略的高斯相位灵敏度
Gaussian phase sensitivity of boson-sampling-inspired strategies
论文作者
论文摘要
在这项工作中，我们研究了使用高斯资源和测量值的通用线性干涉方案的相位灵敏度。我们的形式主义是基于Fisher信息。这使我们能够将测量方案，实验缺陷和辅助系统的贡献分开。我们使用广泛的多模高斯状态来证明这种形式主义的强度，这些状态包括单模型和两种模式场景的众所周知的结果。使用此过程，我们证明输入相干状态或挤压在先前以玻色子采样为灵感的相位估计方案中提出的非经典状态。我们还开发了一种新型的多色干涉方案，证明了相对于两种模式挤压效果的增强灵敏度，为此，理想的同伴检测正式证明是最佳的。
In this work we study the phase sensitivity of generic linear interferometric schemes using Gaussian resources and measurements. Our formalism is based on the Fisher information. This allows us to separate the contributions of the measurement scheme, the experimental imperfections, and auxiliary systems. We demonstrate the strength of this formalism using a broad class of multimode Gaussian states that includes well-known results from single- and two-mode metrology scenarios. Using this, we prove that input coherent states or squeezing beat the non-classical states proposed in preceding boson-sampling-inspired phase-estimation schemes. We also develop a novel polychromatic interferometric protocol, demonstrating an enhanced sensitivity with respect to two-mode squeezed-vacuum states, for which the ideal homodyne detection is formally shown to be optimal.
