Dephasing of planar Ge hole spin qubits due to 1/f charge noise

2024/08/19 by Zhanning Wang, Sina Gholizadeh, Xuedong Hu +2 · 1 voice
Physics and Astronomy · #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.111.155403

arxiv published 2024/08/19 · arxiv updated 2025/04/04

Abstract

Hole spin qubits in Ge, investigated for all-electrical spin manipulation because of its large spin-orbit coupling, are exposed to charge noise leading to decoherence. Here we construct a model of 1/f noise from individual fluctuators and determine the dephasing time T₂^* as a function of qubit properties. T₂^* decreases with increasing magnetic field and is an order of magnitude longer for out-of-plane than for in-plane fields for the same Zeeman energy. T₂^* shows little variation as a function of the top gate field and is a complex function of the dot radius. Our results should help experiments to enhance coherence in hole qubit architectures.

Discussions

• Researching random charge jumps which is all the rage across quantum condensed matter physics these days found a nice paper arxiv.org/abs/2408.10302 [bsky, 0 points, 1 comments]

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