Pulsed single-photon magnetometry with a Λ-type three-level system: near-optimal frequency-resolved photon counting
Abstract
We investigate pulsed single-photon magnetometry with a Zeeman-sensitive Λ-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 coupling reshapes the scattering response and can increase magnetic-field information. At critical coupling, real-frequency zeros of the scattering amplitude redistribute information toward measurable spectral intensity, allowing frequency-resolved photon counting to capture nearly all of the magnetic-field information encoded in the output state when the zeros lie within the pulse bandwidth. For long Gaussian pulses with a smooth, nonzero central-frequency scattering amplitude, the additional spectral-intensity contribution and residual spectral-phase information gap decrease as T−2 or faster.
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BibTeX
@misc{moniri2026pulsed,
title = {{Pulsed single-photon magnetometry with a $Λ$-type three-level system: near-optimal frequency-resolved photon counting}},
author = {Seyed Mostafa Moniri and Elnaz Darsheshdar and Mikayel Khanbekyan},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.27979},
eprint = {2608.27979},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.27979},
}
RIS
TY - UNPB
TI - Pulsed single-photon magnetometry with a Λ-type three-level system: near-optimal frequency-resolved photon counting
AU - Seyed Mostafa Moniri
AU - Elnaz Darsheshdar
AU - Mikayel Khanbekyan
PY - 2026
DA - 2026/08/28
PB - arXiv
DO - 10.48550/arxiv.2608.27979
UR - https://arxiv.org/abs/2608.27979
AB - We investigate pulsed single-photon magnetometry with a Zeeman-sensitive Λ-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 coupling reshapes the scattering response and can increase magnetic-field information. At critical coupling, real-frequency zeros of the scattering amplitude redistribute information toward measurable spectral intensity, allowing frequency-resolved photon counting to capture nearly all of the magnetic-field information encoded in the output state when the zeros lie within the pulse bandwidth. For long Gaussian pulses with a smooth, nonzero central-frequency scattering amplitude, the additional spectral-intensity contribution and residual spectral-phase information gap decrease as T^−2 or faster.
ER -