论文标题
量子增强差分原子干涉仪和旋转式交换的时钟
Quantum-enhanced differential atom interferometers and clocks with spin-squeezing swapping
论文作者
论文摘要
多亏了共同模式噪声排斥，差异配置对于与原子干涉仪的相位和频率估计的现实应用至关重要。当前，具有不相关粒子和模式分离设置的差分协议达到了由标准量子限制（SQL）界定的灵敏度。在这里，我们表明差异干涉法可以理解为分布式多参数估计问题，并且可以从模式和粒子纠缠中受益。我们的协议使用单个自旋方态状态，该状态在常见的干涉模式中汇总了模式。优化了模式交换以估计差异相位偏移的敏感性。数值计算由指导协议优化的分析近似值支持。该方案还通过模拟原子钟和干涉仪中的噪声进行测试。
Thanks to common-mode noise rejection, differential configurations are crucial for realistic applications of phase and frequency estimation with atom interferometers. Currently, differential protocols with uncorrelated particles and mode-separable settings reach a sensitivity bounded by the standard quantum limit (SQL). Here we show that differential interferometry can be understood as a distributed multiparameter estimation problem and can benefit from both mode and particle entanglement. Our protocol uses a single spin-squeezed state that is mode-swapped among common interferometric modes. The mode swapping is optimized to estimate the differential phase shift with sub-SQL sensitivity. Numerical calculations are supported by analytical approximations that guide the optimization of the protocol. The scheme is also tested with simulation of noise in atomic clocks and interferometers.
