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QI: Fachverband Quanteninformation

QI 11: Semiconductor Spin Qubits II: Si, Ge, and Color Centers

QI 11.3: Vortrag

Dienstag, 11. März 2025, 11:45–12:00, HS II

Mitigating Crosstalk in Single Hole-Spin Qubits in Anisotropic Semiconductor Systems — •Yaser Hajati, Irina Heinz, and Guido Burkard — Physics department, Konstanz, University of Konstanz

Spin qubits based on valence band hole states in silicon (Si) and germanium (Ge) are highly promising candidates for quantum information processing, owing to their strong spin-orbit coupling and ultrafast operation speeds. As these systems scale up, achieving high-fidelity single-qubit operations becomes crucial. However, mitigating crosstalk between neighboring qubits in larger arrays, especially for anisotropic qubits with strong spin-orbit coupling such as hole spins in Ge, presents a significant challenge. In this study, we explore the impact of crosstalk on qubit fidelities during single-qubit operations and derive an analytical equation that provides a synchronization condition to eliminate crosstalk in anisotropic media. Our analysis suggests optimized driving field conditions that can robustly synchronize Rabi oscillations, minimizing crosstalk and showing a strong dependence on qubit anisotropy and the orientation of the external magnetic field. By incorporating experimental data, we identify a set of parameters that enable nearly crosstalk-free single-qubit gates, thereby advancing the development of scalable quantum computing architectures.

Keywords: spin qubit; anisotropic; crosstalk; gate fidelity; quantum information