Modern comagnetometry is—in absolute energy units—the most sensitive experimental technique for measuring the energy splitting between quantum states, with certain implementations measuring the nuclear spin-up/spin-down splitting at the 10⁻²⁶eV level. By measuring and subtracting the leading magnetic effects on the spins, comagnetometry can be used to study non-standard-model spin interactions. New physics scenarios that comagnetometers can probe include EDMs, violations of Lorentz invariance, Goldstone bosons from new high-energy symmetries, spin-dependent and CP-violating long-range forces, and axionic dark matter. We describe the many implementations that have been developed and optimized for these applications, and consider the prospects for improvements in the technique. Based purely on existing technology, there is room for several orders of magnitude in further improvement in statistical sensitivity. We also evaluate sources of systematic error and instability that may limit attainable improvements.

以绝对能量单位计，现代电磁测量是测量量子态之间能量分裂的最灵敏的实验技术，某些实现测量 10 ^-26处的核自旋向上/自旋向下分裂eV 水平。通过测量和减去对自旋的主要磁效应，共磁测量可用于研究非标准模型自旋相互作用。共磁力计可以探测的新物理场景包括 EDM、洛伦兹不变性的违反、来自新高能对称性的戈德斯通玻色子、依赖自旋和违反 CP 的长程力以及轴离子暗物质。我们描述了为这些应用程序开发和优化的许多实现，并考虑了该技术的改进前景。纯粹基于现有技术，统计灵敏度还有几个数量级的进一步提升空间。我们还评估了可能限制可实现的改进的系统误差和不稳定性的来源。