Pulsed single-photon magnetometry with a $\Lambda$-type three-level system: near-optimal frequency-resolved photon counting
We investigate pulsed single-photon magnetometry with a Zeeman-sensitive $\Lambda$-type three-level system driven by a classical control field. We derive the asymptotic output state and decompose its quantum Fisher information into photon-loss, spectral-intensity, and spectral-phase contributions. Environmental couplin...