We demonstrate the control of the alpha-proton nuclear spin, I=1/2, coupledto the stable radical CH(COOH)2, S=1/2, in a gamma-irradiated malonic acidsingle crystal using only microwave pulses. We show that, depending on thestate of the electron spin mS=+/-1/2, the nuclear spin can be locked in adesired state or oscillate between mI=+1/2 and mI=-1/2 on the nanosecond timescale. This approach provides a fast and efficient way of controlling nuclearspin qubits and also enables the design of switchable spin-based quantum gatesby addressing only the electron spin.
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