Enhanced Atomic Magnetometry with a Pinched Spin State

Abstract

The sensitivity of an atomic spin sensor is fundamentally constrained by the quantum Fisher information (QFI) of the probe state. The pinched state, |F,0⟩, has an (F+1)-fold larger single-particle QFI for transverse-field sensing than the stretched state, |F,F⟩, corresponding to a predicted √(F+1) reduction in the spin-projection-noise-limited field uncertainty. We show that this advantage can be accessed in an rf sensing scheme by engineering a spectrum symmetric about m=0, yielding an ideal (F+1)-fold enhancement of magnetic-field response. For ⁸⁷Rb with F=2, we observe up to 2.7-fold response enhancement. Implementing this approach in a compact 0.8 cm³ anti-relaxation-coated multipass cell, we realize a single-beam, dual-axis, zero-field magnetometer, achieving $13−−23\mathrm{fT}/\sqrt{\mathrm{Hz}}$ over $3−−100$~Hz at room temperature.

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BibTeX RIS

BibTeX

@misc{guo2026enhanced,
  title = {{Enhanced Atomic Magnetometry with a Pinched Spin State}},
  author = {Tingxuan Guo and Xiangyu Li and Yang Li and Kaifeng Zhao},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.25714},
  eprint = {2609.25714},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.25714},
}

RIS

TY  - UNPB
TI  - Enhanced Atomic Magnetometry with a Pinched Spin State
AU  - Tingxuan Guo
AU  - Xiangyu Li
AU  - Yang Li
AU  - Kaifeng Zhao
PY  - 2026
DA  - 2026/09/22
PB  - arXiv
DO  - 10.48550/arxiv.2609.25714
UR  - https://arxiv.org/abs/2609.25714
AB  - The sensitivity of an atomic spin sensor is fundamentally constrained by the quantum Fisher information (QFI) of the probe state. The pinched state, |F,0⟩, has an (F+1)-fold larger single-particle QFI for transverse-field sensing than the stretched state, |F,F⟩, corresponding to a predicted √(F+1) reduction in the spin-projection-noise-limited field uncertainty. We show that this advantage can be accessed in an rf sensing scheme by engineering a spectrum symmetric about m=0, yielding an ideal (F+1)-fold enhancement of magnetic-field response. For ^87Rb with F=2, we observe up to 2.7-fold response enhancement. Implementing this approach in a compact 0.8 cm^3 anti-relaxation-coated multipass cell, we realize a single-beam, dual-axis, zero-field magnetometer, achieving $13−−23\mathrm{fT}/\sqrt{\mathrm{Hz}}$ over $3−−100$~Hz at room temperature.
ER  -

Abstract

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