Fig. 3: Optimal frequency discrimination of complex signals. | npj Quantum Information

Fig. 3: Optimal frequency discrimination of complex signals.

From: Optimal frequency measurements with quantum probes

Fig. 3

a, b Calculated magnetic field experienced by the NV center exposed to a solution of ethanol (red) or propanol (blue) in frequency (a) and time (b) domains, where a π/2 pulse is applied to the thermally polarized sample at zero time. c Calculated optimal control sequence of π-pulses applied to the NV sensor (purple) overlayed on the signal difference (green). d Sensor phase accumulation in presence of ethanol (red), propanol (blue), and the phase difference (green), showing quadratic scaling at short times.

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