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We introduce and demonstrate a hybrid optically-pumped magnetometer (hOPM)that simultaneously measures one dc field component and one rf field componentquadrature with a single atomic spin ensemble. The hOPM achievessub-pT/$\sqrt{\mathrm{Hz}}$ sensitivity for both dc and rf fields, and islimited in sensitivity by spin projection noise at low frequencies and byphoton shot noise at high frequencies. We demonstrate with the hOPM a newapplication of multi-parameter quantum sensing: background-cancelling spreadspectrum magnetic communication. We encode a digital message as rf amplitude,spread among sixteen very-low and low frequency channels in a noisy magneticenvironment, and observe quantum-noise-limited rf magnetic signal recoveryenabled by quantum-noise-limited dc noise cancellation, reaching noiserejection of \SI{15}{\decibel} at \SI{100}{\hertz} and more than\SI{20}{\decibel} at \SI{60}{\hertz} and below. We measure signal fidelityversus signal strength and extrinsic noise in communication of adigitally-encoded text message. The combination of high sensitivity,quantum-noise-limited performance, and real-world application potential makesthe hOPM an ideal system in which to study high-performance multi-parameterquantum sensing.

Multi-parameter quantum sensing and magnetic communications with a hybrid dc/rf optically-pumped magnetometer