Fig. 4: Experimental realization of the two readout strategies—ensemble averaging and SSR. | npj Quantum Information

Fig. 4: Experimental realization of the two readout strategies—ensemble averaging and SSR.

From: Optimal frequency measurements with quantum probes

Fig. 4

a Ensemble averaging. The complete sequence of sensor initialization, sensing period, and optical readout is performed Nens times. b Single-shot readout (SSR). After one sensing duration, the sensor state is mapped onto the ancilla readout qubit (13C nucleus). Optical readout of the ancilla spin is weakly perturbing, allowing its population to be probed NRR times with a quantum non-demolition measurement.

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