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We report coherent spin manipulation on Cr$^{5+}$ (\emph{S} = 1/2, \emph{I} =0) doped K$_3$NbO$_8$, which constitutes a dilute two-level model relevant foruse as a spin qubit. Rabi oscillations are observed for the first time in aspin system based on transition metal oxides up to room temperature. At liquidhelium temperature the phase coherence relaxation time \emph{$T_2$} reaches$\sim 10$ $\mu$s and, with a Rabi frequency of 20 MHz, yields a single qubitfigure of merit \emph{$Q_M$} of about 500. This shows that a diluted ensembleof Cr$^{5+}$ (\emph{S} = 1/2) doped K$_3$NbO$_8$ is a potential candidate forsolid-state quantum information processing.

Coherent manipulation of electron spins up to ambient temperatures in Cr$^{5+}$(S=1/2) doped K$_3$NbO$_8$