论文标题
使用挤压光的光磁力计提高振幅调节的磁光原子磁力计的灵敏度
Improving Sensitivity of an Amplitude-Modulated Magneto-Optical Atomic Magnetometer using Squeezed Light
论文作者
论文摘要
我们通过实验表明，与在相同条件下相同的探针场相比，与振幅调节泵相比，挤压的探针光场可以根据非线性磁光旋转（NMOR）提高磁场测量值的灵敏度。为了实现全原子磁力计原型，我们利用非线性原子相互作用（称为极化自动旋转（PSR））产生挤压探针场。一个独立的泵场，在偏置磁场的Larmor频率下进行了振幅调节，使我们能够将最敏感的NMOR测量范围扩展到亚高斯磁场。虽然磁力计的总体敏感性相当低（$> 250 \ MATHRM {pt}/\ sqrt {\ Mathrm {hz}} $，但我们显然清楚地观察了$ 15 \％$ $敏感性的提高，当使用挤压探针时，我们使用的观察值是最近的量子7。 [QUANT-PH]。
We experimentally demonstrate that a squeezed probe optical field can improve the sensitivity of the magnetic field measurements based on nonlinear magneto-optical rotation (NMOR) with an amplitude-modulated pump when compared to a coherent probe field under identical conditions. To realize an all-atomic magnetometer prototype, we utilize a nonlinear atomic interaction, known as polarization self-rotation(PSR), to produce a squeezed probe field. An independent pump field, amplitude-modulated at the Larmor frequency of the bias magnetic field, allows us to extend the range of most sensitive NMOR measurements to sub-Gauss magnetic fields. While the overall sensitivity of the magnetometer is rather low ($>250\mathrm{pT}/\sqrt{\mathrm{Hz}}$, we clearly observe a $15\%$ sensitivity improvement when the squeezed probe is used. Our observations confirm the recently reported quantum enhancement in a modulated atomic magnetometer arXiv:2108.01519 [quant-ph].
