A monolithic dual-core photonic crystal fiber (PCF) probe employing an integrated nitrogen-vacancy diamond microcrystal and microwave transmission line is shown to enable highly sensitive dual-channel vectorial magnetic field measurements by means of optical detection of magnetic resonances with both fiber cores. Reliable detection of microscale spatial magnetic-field variations on the order of 10 μT is demonstrated with a PCF probe possessing a core-to-core separation of 6 μm. Such a fiber probe is shown to provide a powerful tool for three-dimensional vectorial mapping of weak magnetic fields emanating from spatially localized objects.

中文翻译：

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双芯光子晶体光纤的量子立体磁测量

单片双芯光子晶体光纤 (PCF) 探针采用集成的氮空位金刚石微晶和微波传输线，通过对两个光纤芯的磁共振进行光学检测，实现高灵敏度的双通道矢量磁场测量。使用具有 6 μm 核心与核心间隔的 PCF 探针证明了对 10 μT 数量级的微尺度空间磁场变化的可靠检测。这种光纤探头被证明为空间定位物体发出的弱磁场的三维矢量映射提供了强大的工具。