Fig. 3: FI against total incident photon number n to sense a static magnetic field.
From: Improving the precision of optical metrology by detecting fewer photons with biased weak measurement
a By varying the incident photon number, the amount of elicited classical FI is calculated when the extinction ratio and post-selection strength \(\epsilon\) are set to 90,000 and 0.2, respectively. Compared to SWM and CW, BWM demonstrates excellent ability to subdue DSE and allows much more FI to be obtained. b For three values of \(\epsilon\), the FI is calculated for SWM and BWM protocols with infinite extinction ratio. For each value of \(\epsilon\), BWM detects much fewer photons than SWM, and the achievable FI significantly outperforms that of SWM
