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Crosstalk analysis in single hole-spin qubits within highly anisotropic g-tensors

Yaser Hajati*, Irina Heinz†, and Guido Burkard‡

  • *Contact author: yaser.hajati@uni-konstanz.de
  • †Contact author: irina.heinz@uni-konstanz.de
  • ‡Contact author: guido.burkard@uni-konstanz.de
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Phys. Rev. Research 7, 023277 – Published 18 June, 2025

DOI: https://doi.org/10.1103/qzn2-l71q

Abstract

Spin qubits based on valence band hole states are highly promising for quantum information processing due to their strong spin-orbit coupling and ultrafast operation speed. As these systems scale up, achieving high-fidelity single-qubit operations becomes essential. However, mitigating crosstalk effects from neighboring qubits in larger arrays, particularly for anisotropic qubits with strong spin-orbit coupling, presents a significant challenge. We investigate the impact of crosstalk on qubit fidelities during single-qubit operations and derive an analytical equation that serves as a synchronization condition to eliminate crosstalk in anisotropic media. Our analysis proposes optimized driving field conditions that can robustly synchronize Rabi oscillations and minimize crosstalk, showing a strong dependence on qubit anisotropy and the orientation of the external magnetic field. Taking experimental data into our analysis, we identify a set of parameter values that enable nearly crosstalk-free single-qubit gates, thereby paving the way for scalable quantum computing architectures.

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Phys. Rev. Research 7, 023277– Published 18 June, 2025
  • Received 27 January 2025
  • Accepted 23 May 2025
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