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

Abstract

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 for use as a spin qubit. Rabi oscillations are observed for the first time in a spin system based on transition metal oxides up to room temperature. At liquid helium 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 qubit figure of merit \emph{$Q_M$} of about 500. This shows that a diluted ensemble of Cr${}^{5+}$ (\emph{S} = 1/2) doped K${}_3$NbO${}_8$ is a potential candidate for solid-state quantum information processing.

4 pages

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