AI 中文总结
该研究利用金刚石中的中性氮-空位中心（NV⁰）开发了室温各向同性纳米级量子传感器，解决了传统色心量子传感器的离轴信号损失问题，可实现任意磁场方向的高灵敏度磁力测量，适用于生命科学与量子材料领域的纳米级磁力测绘。
AI 中文摘要
基于色心的量子传感器在环境条件下可提供纳米级分辨率，但其适用性仍受限制：由于量化轴被锁定在宿主晶格上，传统色心在离轴磁场中会出现严重信号损失。为解决此问题，我们报告了一种由金刚石中电中性氮-空位中心（NV⁰）实现的各向同性磁力计。在此，自旋-电荷动力学产生NV⁰暗自旋对，其量化轴可动态与外磁场对齐；通过NV电荷态选择荧光读取，该系统在室温下具有微秒级相干时间和任意磁场方向下的纳特斯拉灵敏度。我们演示了陡峭磁场梯度与顺磁性微靶标的无对准测绘，以及随机取向纳米金刚石的各向同性读取。该平台解决了长期存在的取向约束，为生命科学和量子材料领域开辟了不受限制的纳米级磁力测量途径。
英文摘要
Color-center based quantum sensors provide nanoscale resolution under ambient conditions, yet their applicability remains limited. Because the quantization axes are locked to the host lattice, conventional color centers suffer severe signal loss in off-axis magnetic fields. To address this, we report an isotropic magnetometer enabled by the neutrally charged nitrogen-vacancy center (NV0) in diamond. Here, spin-to-charge dynamics yield an NV0-dark spin pair whose quantization axis dynamically aligns with the external field. Read out through NV charge-state-selective fluorescence, this system exhibits microsecond room-temperature coherence and nanotesla sensitivity for arbitrary field directions. We demonstrate alignment-free mapping of steep field gradients and single paramagnetic micro-targets, alongside isotropic readout from randomly oriented nanodiamonds. Resolving longstanding orientation constraints, this platform unlocks unrestricted nanoscale magnetometry across life sciences and quantum materials.
