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Controlling decoherence is the most challenging task in realizing quantuminformation hardware. Single electron spins in gallium arsenide are a leadingcandidate among solid- state implementations, however strong coupling tonuclear spins in the substrate hinders this approach. To realize spin qubits ina nuclear-spin-free system, intensive studies based on group-IV semiconductorare being pursued. In this case, the challenge is primarily control ofmaterials and interfaces, and device nanofabrication. We report important stepstoward implementing spin qubits in a predominantly nuclear-spin-free system bydemonstrating state preparation, pulsed gate control, and charge-sensing spinreadout of confined hole spins in a one-dimensional Ge/Si nanowire. With fastgating, we measure T1 spin relaxation times in coupled quantum dots approaching1 ms, increasing with lower magnetic field, consistent with a spin-orbitmechanism that is usually masked by hyperfine contributions.

Spin Relaxation in Ge/Si Core-Shell Nanowire Qubits