论文标题
用位移辅助的SU（1,1）干涉仪进行量子改良的相位估计
Quantum-improved phase estimation with a displacement-assisted SU(1,1) interferometer
论文作者
论文摘要
通过在SU（1,1）干涉仪内部执行两个局部位移操作（LDOS），称为位移辅助SU（1,1）[DSU（1,1）]，基于同源性检测和量子渔民信息（QFI）的相位灵敏度在本文中都在本文中进行了研究。在此DSU（1,1）干涉仪中，我们将注意力集中在引入的LDO在多大程度上影响相位灵敏度和QFI，即使在现实情况下也是如此。我们的分析表明，DSU（1,1）干涉仪的估计性能始终比没有LDO的SU（1,1）干涉仪的估计表现更好，尤其是通过LDO强度的提高，在理想情况下逐渐接近Heisenberg限制的前者的相位精度。更重要的是，与后者不同，可以通过调节和控制LDO来显着增强前者的鲁棒性。我们的发现将为光学干涉仪的量子改良相位估计打开一个有用的视图。
By performing two local displacement operations (LDOs) inside an SU(1,1) interferometer, called as the displacement-assisted SU(1,1) [DSU(1,1)], both the phase sensitivity based on homodyne detection and quantum Fisher information (QFI) with and without photon losses are investigated in this paper. In this DSU(1,1) interferometer, we focus our attention on the extent to which the introduced LDO affects the phase sensitivity and the QFI, even in the realistic scenario. Our analyses show that the estimation performance of DSU(1,1) interferometer is always better than that of SU(1,1) interferometer without the LDO, especially the phase precision of the former in the ideal scenario gradually approaching to the Heisenberg limit via the increase of the LDO strength. More significantly, different from the latter, the robustness of the former can be enhanced markedly by regulating and controlling the LDO. Our findings would open an useful view for quantum-improved phase estimation of optical interferometers.
