Harnessing electron motion for global spin qubit control

• URL: http://arxiv.org/abs/2503.12767v2
• Date: Sun, 19 Oct 2025 19:09:20 GMT
• Title: Harnessing electron motion for global spin qubit control
• Authors: Hamza Jnane, Adam Siegel, M. Fernando Gonzalez-Zalba,
• Abstract summary: Silicon spin qubits are promising candidates for building scalable quantum computers.<n> delivering microwave control signals locally to each qubit poses a challenge.<n>We show that the use of our schemes enables single-qubit fidelity improvements up to a factor of 100 compared to the state-of-the-art.
• Score: 2.362412515574206
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Silicon spin qubits are promising candidates for building scalable quantum computers due to their nanometre scale features. However, delivering microwave control signals locally to each qubit poses a challenge and instead methods that utilise global control fields have been proposed. These require tuning the frequency of selected qubits into resonance with a global field while detuning the rest to avoid crosstalk. Common frequency tuning methods, such as electric-field-induced Stark shift, are insufficient to cover the frequency variability across large arrays of qubits. Here, we argue that electron motion, and especially the recently demonstrated high-fidelity shuttling, can be leveraged to enhance frequency tunability. Our conclusions are supported by numerical simulations proving its efficiency on concrete architectures such as a 2$\times$N array of qubits and the recently introduced looped pipeline architecture. Specifically, we show that the use of our schemes enables single-qubit fidelity improvements up to a factor of 100 compared to the state-of-the-art. Finally, we show that our scheme can naturally be extended to perform two-qubit gates globally.

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