Postselected amplification and photon recycling applied to optical sensing of magnetic fields
Phys. Rev. A 114, 042449 – Published 23 October, 2026
DOI: https://doi.org/10.1103/brjc-s4gt
Abstract
We apply the combined technique of postselected amplification and photon recycling to an optical setup of magnetic-field precision measurement. We propose two recycling schemes and obtain analytic expressions for the amplified signal and measurement sensitivity. The results show significant improvement of the performance over conventional measurement. The underlying reason is twofold. On one hand, the recycling technique eliminates data loss and maintains noise level comparable to conventional measurement. On the other hand, intentional postselection within this framework can amplify the signal. Thus, the measurement signal-to-noise ratio is enhanced.
