  Nitrogen vacancy (NV) centers in diamonds is a promising system for quantum
information processing and quantum sensing, and the control of the quantum
state is essential for practical applications. In this study, we demonstrate a
control of all the three transitions among the ground state sublevels of NV
centers by applying external magnetic driving fields. To address the states of
a specific NV axis among the four axes, we apply a magnetic field orthogonal to
the NV axis. We control two transitions by microwave pulses and the remaining
transition by radio frequency pulses. In particular, we investigate the
dependence of Rabi oscillations on the frequency and intensity of the radio
frequency pulses. Our results pave the way for a novel control of NV centers
for the realization of quantum information processing and quantum sensing.

Quantum Physics