We report on an optical magnetometer enhanced by vacuum-squeezed light, employing an Mx magnetometer based on ${}^{87}\mathrm{Rb}$ vapor in a micrometer-scale cell (approximately 100 µm). Using the well-established polarization self-rotation effect in a room-temperature ${}^{87}\mathrm{Rb}$ vapor cell, we achieve 4 dB of vacuum squeezing within the noise spectral window of 100 Hz to several MHz, corresponding to 4.5-dB squeezing when accounting for optical losses. Leveraging this level of squeezing, we demonstrate a magnetic-field sensitivity of approximately 1 pT√Hz. The combination of vacuum-squeezed light and micrometer-scale vapor cells paves the way for compact, low-power-consumption atomic sensors with enhanced performance.

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• Atom optics
• Light-matter interaction
• Magnetometry
• Quantum optics
• Quantum sensing
• Quantum states of light
• Atomic gases
• Precision measurements