论文标题
通过挤压和参数扩增增强了角位移估计
Angular displacements estimation enhanced by squeezing and parametric amplification
论文作者
论文摘要
从理论上讲，我们基于修改的Mach-Zhhnder干涉仪（MZI）研究角位移估计，其中两个光学参数放大器（PAS）分别被引入标准MZI的两个臂。 PAS的使用既可以挤压射击噪声，又可以放大干涉仪内部的光子数。当将未知角位移引入两个臂时，我们使用量子Fisher信息矩阵方法来得出多参数量子cramér-rao结合（QCRB），并使用强度检测将两个臂之间的角位移差的结合与角移位之间的角度差异。另一方面，在未知角位移仅在一个臂中的情况下，我们使用同型检测方法给出了角位移的敏感性。它可以超过标准量子限制（SQL）并接近单个参数QCRB。最后，讨论了光子损失对灵敏度的影响。
We theoretically study the angular displacements estimation based on a modified Mach-Zehnder interferometer (MZI), in which two optical parametric amplifiers (PAs) are introduced into two arms of the standard MZI, respectively. The employment of PAs can both squeeze the shot noise and amplify the photon number inside the interferometer. When the unknown angular displacements are introduced to both arms, we derive the multiparameter quantum Cramér-Rao bound (QCRB) using the quantum Fisher information matrix approach, and the bound of angular displacements difference between the two arms is compared with the sensitivity of angular displacement using the intensity detection. On the other hand, in the case where the unknown angular displacement is in only one arm, we give the sensitivity of angular displacement using the method of homodyne detection. It can surpass the standard quantum limit (SQL) and approach the single parameter QCRB. Finally, the effect of photon losses on sensitivity is discussed.
