The optimal observable for the nucleon-coupling ratio in a dual-alkali comagnetometer is the complex inter-channel ratio; its phase is calibration-free and near-sufficient above ~100 Hz, while the amplitude ratio adds information at low frequencies only if the gain is calibrated.
Axion-like Relics: New Constraints from Old Comagne- tometer Data.JHEP2020,01, 167
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Optimal Calibration-Free Observable for the Nucleon-Coupling Ratio in a Dual-Alkali Comagnetometer for Dark Matter Searches
The optimal observable for the nucleon-coupling ratio in a dual-alkali comagnetometer is the complex inter-channel ratio; its phase is calibration-free and near-sufficient above ~100 Hz, while the amplitude ratio adds information at low frequencies only if the gain is calibrated.