MIT researchers have demonstrated a method to simultaneously measure multiple physical quantities using a solid-state quantum sensor operating at room temperature. By exploiting quantum entanglement between two qubits — the electronic spin and nuclear spin of nitrogen-vacancy (NV) centers in diamond — they performed Bell state measurements to simultaneously capture the amplitude, frequency, and phase of a microwave field. This multiparameter estimation approach outperforms sequential single-quantity measurements in both speed and accuracy. The technique has potential applications in biomedical sensing (e.g., studying cancer cells) and materials characterization, and represents a significant step from theoretical quantum multiparameter estimation to practical experimental demonstration.
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