Sweet-spot operation of a germanium hole spin qubit with highly anisotropic noise sensitivity
arxiv(2023)
摘要
Spin qubits defined by valence band hole states comprise an attractive
candidate for quantum information processing due to their inherent coupling to
electric fields enabling fast and scalable qubit control. In particular, heavy
holes in germanium have shown great promise, with recent demonstrations of fast
and high-fidelity qubit operations. However, the mechanisms and anisotropies
that underlie qubit driving and decoherence are still mostly unclear. Here, we
report on the highly anisotropic heavy-hole g-tensor and its dependence on
electric fields, allowing us to relate both qubit driving and decoherence to an
electric modulation of the g-tensor. We also confirm the predicted Ising-type
hyperfine interaction but show that qubit coherence is ultimately limited by
1/f charge noise. Finally, we operate the qubit at low magnetic field and
measure a dephasing time of T_2^*=9.2 μs, while maintaining a
single-qubit gate fidelity of 99.94
operation temperature T>1 K. This understanding of qubit driving and
decoherence mechanisms are key for the design and operation of scalable and
highly coherent hole qubit arrays.
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