Spin Relaxation Benchmarks and Individual Qubit Addressability for Holes in Quantum Dots

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Abstract
We investigate hole spin relaxation in the single- and multi-hole regime in a 2x2 germanium quantum dot array. We find spin relaxation times T1 as high as 32 ms and 1.2 ms for quantum dots with single- and five-hole occupations respectively, setting benchmarks for spin relaxation times for hole quantum dots. Furthermore, we investigate qubit addressability and electric field sensitivity by measuring resonance frequency dependence of each qubit on gate voltages. We can tune the resonance frequency over a large range for both single and multi-hole qubits, while simultaneously finding that the resonance frequencies are only weakly dependent on neighbouring gates. In particular, the five-hole qubit resonance frequency is more than twenty times as sensitive to its corresponding plunger gate. Excellent individual qubit tunability and long spin relaxation times make holes in germanium promising for addressable and high-fidelity spin qubits in dense two-dimensional quantum dot arrays for large-scale quantum information.
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  • Nederlandse Organisatie voor Wetenschappelijk Onderzoek

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