Quantum-enhanced magnetometry at optimal number density
- URL: http://arxiv.org/abs/2308.12933v1
- Date: Thu, 24 Aug 2023 17:14:19 GMT
- Title: Quantum-enhanced magnetometry at optimal number density
- Authors: Charikleia Troullinou and Vito Giovanni Lucivero and Morgan W.
Mitchell
- Abstract summary: We study the use of squeezed probe light and evasion of measurement back-action to enhance the sensitivity and measurement bandwidth of an optically-pumped magnetometer (OPM)
A spin-exchange-limited OPM probed with off-resonance laser light is shown to have an optimal sensitivity determined by density-dependent quantum noise contributions.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We study the use of squeezed probe light and evasion of measurement
back-action to enhance the sensitivity and measurement bandwidth of an
optically-pumped magnetometer (OPM) at sensitivity-optimal atom number density.
By experimental observation, and in agreement with quantum noise modeling, a
spin-exchange-limited OPM probed with off-resonance laser light is shown to
have an optimal sensitivity determined by density-dependent quantum noise
contributions. Application of squeezed probe light boosts the OPM sensitivity
beyond this laser-light optimum, allowing the OPM to achieve sensitivities that
it cannot reach with coherent-state probing at any density. The observed
quantum sensitivity enhancement at optimal number density is enabled by
measurement back-action evasion.
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