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This theoretical study advances quantum computing by demonstrating that three-hole qubits in germanium can outperform traditional single-hole configurations in both Rabi frequencies and quality factors. The research suggests a viable path toward scaling hole-spin qubit architectures beyond the limitations of singly occupied quantum dots without relying on strained systems alone.

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Hole-spin qubits in germanium beyond the single-particle regime

arXivJuly 29, 20261 min read

arXiv:2505.02449v3 Announce Type: replace-cross Abstract: The intense simulation efforts on hole-spin qubits in germanium have so far focused primarily on singly occupied quantum dots. Here, we theoretically investigate three-hole qubits in germanium and demonstrate that their performance can rival that of single-hole qubits in both strained and unstrained systems. In particular, we find that -- in the widely used quasi-circular geometry -- a three-hole qubit encoding can yield enhancements of the Rabi frequencies of up to two orders of magnitude and a large advantage also in terms of quality factors.

Abstract:The intense simulation efforts on hole-spin qubits in germanium have so far focused primarily on singly occupied quantum dots. Here, we theoretically investigate three-hole qubits in germanium and demonstrate that their performance can rival that of single-hole qubits in both strained and unstrained systems. In particular, we find that -- in the widely used quasi-circular geometry -- a three-hole qubit encoding can yield enhancements of the Rabi frequencies of up to two orders of magnitude and a large advantage also in terms of quality factors.

Revised version: 5.5 pages (main) + 6.5 pages (appendices) + bibliography; 16 figures

Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Quantum Physics (quant-ph)

arXiv:2505.02449 [cond-mat.mes-hall]

(or arXiv:2505.02449v3 [cond-mat.mes-hall] for this version)

Full text under the publisher's open licence · 114 words

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