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A nitrogen-vacancy (NV) center in a diamond enables the access to an electronspin, which is expected to present highly sensitive quantum sensors. Althoughexploiting a nitrogen nuclear spin improves the sensitivity, manipulating itusing a resonant pulse requires a long gate time owing to its smallgyromagnetic ratio. Another technique to control nuclear spins is a conditionalrotation gate based on dynamical decoupling, which is faster but unavailablefor nitrogen spins owing to the lack of transverse hyperfine coupling with theelectron spin. In this study, we generated effective transverse coupling byapplying a weak off-axis magnetic field. An effective coupling depends on theoff-axis field; the conditional rotation gate on the nitrogen-14 spins of an NVcenter was demonstrated within 4.2 {\mu}s under an 1.8% off-axis field and alongitudinal field of approximately 280 mT. We estimated that a populationtransfer from the electron to nitrogen spins can be implemented with 8.7{\mu}s. Our method is applicable to an ensemble of NV centers, in addition to asingle NV center.

Fast coherent control of nitrogen-14 spins associated with nitrogen-vacancy centers in diamonds using dynamical decoupling