压缩真空光输入和光子计数法增强Sagnac效应（英文）

Sagnac-effect Enhancement with Squeezed Vacuum Light Input and Photon Counting Technique

压缩真空光输入和平衡零拍探测可有效增强Sagnac效应,提高陀螺精度;考虑平衡零拍探测的相位精度与相位自身相关,仅在某特定相位能达到最佳灵敏度,设计了一种基于光子计数法提取Sagnac输出相位的方案,并利用贝叶斯理论估计相位.理论分析结果表明,该方法能突破散粒噪声极限,相位精度不再受限于相位自身,且当压缩真空光和相干激光功率相同时,精度在理论上能达到海森堡极限.

Sagnac effect can be enhanced with squeezed vacuum light input and Quantum Balanced Homodyne Detection （QBHD）, which can result in the improvement of the gyroscope precision. By considering the phase sensitivity obtained by QBHD is related to the phase itself, the best sensitivity is achieved only at some certain value of phase. A scheme based photon counting was designed to extract the Sagnac output phase with Bayesian theory. The theoretical analysis results show that, the proposed scheme can break through the Shot Noise Limit（SNL）, and the phase accuracy can reach Heisenberg Limit（HL） theoretically when the power of squeezed vacuum light and coherent light are equal. Meanwhile, the best phase sensitivity can be achieved at any value of phase, which is advantageous for gyro to reach the best sensitivity at any output phase.