Fig. 1. Schematic diagram of NMOR

Fig. 2. Schematic diagram of experimental setup

Fig. 3. Laser frequency configuration in experiment

Fig. 4. Timing configuration in cold atom distribution experiment

Fig. 5. Decoherence effect when cold atoms are polarised under conditions of magnetic induction intensity of 2.43 μT, pump light modulation frequency of 1100 Hz, and pulse duty cycle of 3%

Fig. 6. Modulation frequency is consistent with Larmor frequency when magnetic induction intensity is around 2.43 μT, pump light modulation frequency is 8500 Hz, and pulse duty cycle is 3%

Fig. 7. Comparison of measured magnetic induction intensity with applied magnetic induction intensity

Fig. 8. Noise when applied magnetic induction intensity is fixed to be 1.86 μT and pump light pulse resonates with external magnetic field. (a) Time-domain noise in x direction; (b) frequency-domain noise in x direction

Fig. 9. Noise when applied magnetic induction intensity is fixed to be 1.86 μT and pump light pulse resonates with external magnetic field. (a) Time-domain noise in y direction; (b) frequency-domain noise in y direction

Fig. 10. Allan variance of magnetic field