Harnessing electron motion for global spin qubit control
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866909855019696128 |
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| author | Jnane, Hamza Siegel, Adam Gonzalez-Zalba, M. Fernando |
| author_facet | Jnane, Hamza Siegel, Adam Gonzalez-Zalba, M. Fernando |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_12767 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Harnessing electron motion for global spin qubit control Jnane, Hamza Siegel, Adam Gonzalez-Zalba, M. Fernando Quantum Physics 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. |
| title | Harnessing electron motion for global spin qubit control |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.12767 |