论文标题
DC量子磁力测定法低于Ramsey极限
DC Quantum Magnetometry Below the Ramsey Limit
论文作者
论文摘要
我们演示了超过常规$ T_2^\ AST $限制的DC磁力测定法的灵敏度的直流磁场的量子感应。我们在与自旋连贯性时间相当的钻石旋转的钻石中使用了氮气视口中心，并表征了磁敏感性对测量时间和旋转速度的依赖性。我们的方法仅转换DC感兴趣的字段，并保留传感器的量子相干性。这些结果明确地提高了量子磁力计对DC场的灵敏度，DC场是量子传感工具箱的重要且有用的补充。
We demonstrate quantum sensing of dc magnetic fields that exceeds the sensitivity of conventional $T_2^\ast$-limited dc magnetometry by more than an order of magnitude. We used nitrogen-vacancy centers in a diamond rotating at periods comparable to the spin coherence time, and characterize the dependence of magnetic sensitivity on measurement time and rotation speed. Our method up-converts only the dc field of interest and preserves the quantum coherence of the sensor. These results definitively improve the sensitivity of a quantum magnetometer to dc fields, an important and useful addition to the quantum sensing toolbox.
