Enhanced-sensitivity optical sensing of magnetic fields using postselected amplification and continuous-wave power recycling

arXiv:2611.09379v1 Announce Type: new Abstract: Given the importance of precision weak magnetic field measurement, and noting that postselected amplification has not yet been well applied in this area, in this work we propose to combine the technique of postselected amplification with continuous-wave power recycling for enhanced-sensitivity optical sensing of weak magnetic fields. Based on rigorous derivations, we obtain compact expressions for the total postselection probability and the signal-to-noise ratio. We also analyze the effects originating from various non-ideal factors. In contrast to pulse recycling, continuous-wave recycling has lower control requirements and is more experimentally feasible.