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Hole-spin qubits in germanium beyond the single-particle regime
Andrea Secchi, Gaia Forghieri, Paolo Bordone, Daniel Loss, Stefano Bosco, Filippo Troiani·May 5, 2025
Mesoscale PhysicsQuantum Physics
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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.