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Methods for achieving quantum control and detection of individual nuclearspins by single electrons of solid-state defects play a central role forquantum information processing and nano-scale nuclear magnetic resonance (NMR).However, with standard techniques, no more than 8 nuclear spins have beenresolved. Here we develop a method that improves significantly the ability tospectrally resolve nuclear spins and demonstrate its capabilities with detailednumerical simulations by using a nitrogen-vacancy (NV) centre as model system.Based on delayed entanglement control, a technique combining microwave andradio-frequency (rf) fields, nuclei with resonances in a broad frequency bandcan be unambiguously and individually addressed by the sensor electron.Additionally the spectral resolution can extend beyond the electron spinrelaxation time by using a long-lived qubit memory. Our method greatlyincreases the number of useful register qubits accessible to a defect centreand improves the signals of nano-scale NMR.

Delayed entanglement echo for individual control of a large number of nuclear spins