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. 2017 Mar 3;8:14660. doi: 10.1038/ncomms14660

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(a) A large number of nuclear spins weakly coupled to the electron spin of NV centre by the hyperfine field. (b) Relative amplitudes of the components of the hyperfine field. The perpendicular component is weaker than the parallel component A^|| at the shaded regions of the plot. (c) Illustration of the spin states in the process of delayed entanglement echo, with the entanglement changes sketched in d. Implementation of the delay window by DD (e) or by storing the entanglement to a long-lived memory qubit (f). During the delay window, the driving at RF frequencies provides highly selective control on nuclear spins for addressing. A π pulse applied at the end of the delay window eliminates the coupling from unwanted nuclei as well as static noise.

Inline graphic — (a) A large number of nuclear spins weakly coupled to the electron spin of NV centre by the hyperfine field. (b) Relative amplitudes of the components of the hyperfine field. The perpendicular component is weaker than the parallel component A^|| at the shaded regions of the plot. (c) Illustration of the spin states in the process of delayed entanglement echo, with the entanglement changes sketched in d. Implementation of the delay window by DD (e) or by storing the entanglement to a long-lived memory qubit (f). During the delay window, the driving at RF frequencies provides highly selective control on nuclear spins for addressing. A π pulse applied at the end of the delay window eliminates the coupling from unwanted nuclei as well as static noise.