Guo Jinxian, Ming Sheng, Wu Yuan, Chen L Q, Zhang Weiping
Opt Express. 2021 Jan 4;29(1):208-218. doi: 10.1364/OE.409964.
Lights carrying orbital angular momentum (OAM) have potential applications in precise rotation measurement, especially in remote sensing. Interferometers, especially nonlinear quantum interferometers, have also been proven to greatly improve the measurement accuracy in quantum metrology. By combining these two techniques, we theoretically propose a new atom-light hybrid Sagnac interferometer with OAM lights to advance the precision of the rotation measurement. A rotation sensitivity below standard quantum limit is achieved due to the enhancement of the quantum correlation of the interferometer even with 96% photon losses. This makes our protocol robustness to the photon loss. Furthermore, combining the slow light effect brings us at least four orders of magnitude of sensitivity better than the earth rotation rate. This new type interferometer has potential applications in high precision rotation sensing.
携带轨道角动量（OAM）的光在精确旋转测量中具有潜在应用，尤其是在遥感领域。干涉仪，特别是非线性量子干涉仪，也已被证明能极大提高量子计量中的测量精度。通过结合这两种技术，我们从理论上提出了一种新型的带有OAM光的原子 - 光混合萨格纳克干涉仪，以提高旋转测量的精度。即使存在96%的光子损失，由于干涉仪量子相关性的增强，仍实现了低于标准量子极限的旋转灵敏度。这使得我们的方案对光子损失具有鲁棒性。此外，结合慢光效应使我们的灵敏度比地球自转速率至少提高四个数量级。这种新型干涉仪在高精度旋转传感方面具有潜在应用。
