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arXiv · 2506.23250

Sensitivity Enhancement in Atom-Interferometer Gyroscopes via Phase-Modulation Signal Readout Scheme

Sotatsu Otabe·Naoki Kaku·Tomoya Sato·Martin Miranda·Takuya Kawasaki·Mikio Kozuma
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Abstract

Quantum sensors based on atom interferometers are advancing both fundamental physics and practical applications, with higher sensitivity being a key requirement for these investigations. Here, we experimentally demonstrate a sensitivity enhancement of an atom-interferometer gyroscope using a phase-modulation signal readout scheme. Phase modulation applied to the laser light used for atomic state manipulation is transferred to the atomic phase and read out via multi-harmonic demodulation. The observed sensitivity improvement factor of $1.20\pm0.04$ over the conventional phase sweep scheme agrees with theoretical predictions. We also found that phase-dispersion compensation control, which compensates atomic velocity dispersion and preserves interference contrast at high angular rates, effectively eliminates the nonlinearity inherent in multi-harmonic demodulation. The sensitivity improvement achieved by our method is applicable to a broad class of atom interferometers and requires no modifications to the optical or vacuum systems, making it particularly effective for size-constrained applications such as large-baseline experiments and inertial navigation systems.

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Sotatsu Otabe, Naoki Kaku, Tomoya Sato, Martin Miranda, Takuya Kawasaki, Mikio Kozuma. 2025-06-29. Sensitivity Enhancement in Atom-Interferometer Gyroscopes via Phase-Modulation Signal Readout Scheme. https://arxiv.org/abs/2506.23250

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