Magnetic Field Independent SERF Magnetometer

• URL: http://arxiv.org/abs/2209.13086v1
• Date: Tue, 27 Sep 2022 00:36:02 GMT
• Title: Magnetic Field Independent SERF Magnetometer
• Authors: Mark Dikopoltsev, Uriel Levy, Or Katz
• Abstract summary: We show that atoms with nuclear spin $I=1/2$ can operate in the Spin-Exchange Relaxation Free regime but for any magnitude of the magnetic field. We analyze the performance of a dual-specie potassium and atomic hydrogen magnetometer, and project a fundamental sensitivity of about $10.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: SERF magnetometers based on dense ensembles of alkali-metal spins are precision quantum sensors that hold the record of measured and projected sensitivity to magnetic fields, in the $\mu\textrm{G}-m\textrm{G}$ range. At geomagnetic fields however, these sensors quickly lose their magnetic sensitivity due to spin decoherence by random spin-exchange collisions. Here we discover that atoms with nuclear spin $I=1/2$ can operate in the Spin-Exchange Relaxation Free (SERF) regime but for any magnitude of the magnetic field. We counter-intuitively show that frequent collisions between a dense and optically-inaccessible $(I=1/2)$ gas with another optically-accessible spin gas ($I>1/2$) improve the fundamental magnetic sensitivity of the latter. We analyze the performance of a dual-specie potassium and atomic hydrogen magnetometer, and project a fundamental sensitivity of about $10\,\mathrm{aT}\sqrt{\mathrm{cm}^3/\mathrm{Hz}}$ at geomagnetic fields for feasible experimental conditions.

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