An optical magnetometer using EPR-entangled probe light and variational readout demonstrates 2.1 ± 0.3 dB sensitivity below the standard quantum limit near 7 kHz in a room-temperature cesium vapor.
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Entanglement-enhanced optical magnetometry beyond the standard quantum limit
An optical magnetometer using EPR-entangled probe light and variational readout demonstrates 2.1 ± 0.3 dB sensitivity below the standard quantum limit near 7 kHz in a room-temperature cesium vapor.