Multi-qubit nanoscale sensing with entanglement as a resource

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Nature, Published online: 26 November 2025; doi:10.1038/s41586-025-09760-yControlling pairs of nitrogen vacancy centres enables the measurement of magnetic correlations below the optical diffraction limit, and the use of entangled pairs shows a linear scaling of the measurement sensitivity with readout noise, as opposed to the quadratic scaling that would be obtained with unentangled spins.

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