A room-temperature NV-center experiment simultaneously estimates amplitude, detuning, and phase of a microwave drive from one sequence, with sensitivity improving linearly in interrogation time.
Kahn, Fast rate estimation of a unitary operation in SU(d), Phys
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Entanglement-assisted multiparameter estimation with a solid-state quantum sensor
A room-temperature NV-center experiment simultaneously estimates amplitude, detuning, and phase of a microwave drive from one sequence, with sensitivity improving linearly in interrogation time.