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We present a method to identify spurious signals generated by finite-widthpulses in quantum sensing experiments and apply it to recently proposeddynamical decoupling sequences for accurate spectral interpretation. We firststudy the origin of these fake resonances and quantify their behavior in asituation that involves the measurement of a classical magnetic field. Here weshow that a change of the initial phase of the sensor or, equivalently, of thedecoupling pulses leads to oscillations in the spurious signal intensity whilethe real resonances remain intact. Finally we extend our results to the quantumregime for the unambiguous detection of remote nuclear spins by utilization ofa nitrogen vacancy sensor in diamond.

Pulse-phase control for spectral disambiguation in quantum sensing protocols