The motion of a magnetic levitation structure can lead to low accuracy for magnetically suspended control moment gyros (MSCMG), artificial heart pumps or high precision stable platforms. Measuring this motion is important in orbital navigation and precision measurement technologies, but current methods are unable to measure it with high accuracy under a strong magnetic field around the magnetic levitation structure. Here, we present a method in which nitrogen–vacancy (NV) centers in diamond have been used as a sensor to detect the movement of the magnetic levitation structure. The NV quantum sensors probe the electric field around the suspension magnet induced by the magnet fluctuations. Based on the high sensitivity of 0.3 nT (√Hz)⁻¹, the resolution of motion was about 5 nm. Also, the dynamic movement of the magnetic levitation system has been recorded in real-time with a potential resolution of ∼pm as the magnetic field sensitivity of NV center was improved to ∼pT. Our method offers a novel route to measure and feedback control the magnetic levitation system for MSCMGs in satellite attitude or for magnetic pumps in artificial heart applications.

磁悬浮结构的运动会导致磁悬浮控制力矩陀螺仪（MSCMG），人造心脏泵或高精度稳定平台的精度降低。测量这种运动在轨道导航和精确测量技术中很重要，但是当前的方法无法在磁悬浮结构周围的强磁场下高精度地测量它。在这里，我们提出一种方法，其中金刚石中的氮空位（NV）中心已用作检测磁悬浮结构运动的传感器。NV量子传感器探测由磁体波动引起的悬浮磁体周围的电场。基于0.3 nT（√Hz）^-1的高灵敏度，运动的分辨率约为5 nm。另外，随着NV中心的磁场灵敏度提高到pT，磁悬浮系统的动态运动已经以pm的潜在分辨率实时记录。我们的方法提供了一种新颖的途径来测量和反馈控制卫星姿态的MSCMG或人造心脏应用中的磁力泵的磁悬浮系统。