Metrological Nonlinear Squeezing Parameter
Metrological Nonlinear Squeezing Parameter
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DOI：
10.1103/physrevlett.122.090503
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发表时间：
2019-03-06
影响因子：
8.6
通讯作者：
Pezze, Luca
中科院分区：
文献类型：
--
作者：
Gessner, Manuel;Smerzi, Augusto;Pezze, Luca
众所周知的计量线性压缩参数（例如正交或自旋压缩）可以有效地量化高斯态的灵敏度。然而，这些参数不足以表征更广泛的高度敏感的非高斯状态。在这里，我们介绍一类计量非线性压缩参数，该参数是通过在给定的一组可访问（可能是非线性）算子中对测量可观测量进行分析优化而获得的。这允许对离散和连续变量的非高斯量子态进行计量表征。我们的结果为基于矩的相位参数的高精度估计提供了优化且实验上可行的方法，并且可用于系统地构建复杂量子态的多部分纠缠和非经典性见证。
The well-known metrological linear squeezing parameters (such as quadrature or spin squeezing) efficiently quantify the sensitivity of Gaussian states. Yet, these parameters are insufficient to characterize the much wider class of highly sensitive non-Gaussian states. Here, we introduce a class of metrological nonlinear squeezing parameters obtained by analytical optimization of measurement observables among a given set of accessible (possibly nonlinear) operators. This allows for the metrological characterization of non-Gaussian quantum states of discrete and continuous variables. Our results lead to optimized and experimentally feasible recipes for a high-precision moment-based estimation of a phase parameter and can be used to systematically construct multipartite entanglement and nonclassicality witnesses for complex quantum states.