Microscopic modeling of flopping-mode quantum dot spin qubits
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866918494415618048 |
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| author | Kinikar, Ashutosh Levajac, Vukan Moors, Kristof Simion, George Benito, Monica Soree, Bart |
| author_facet | Kinikar, Ashutosh Levajac, Vukan Moors, Kristof Simion, George Benito, Monica Soree, Bart |
| contents | We present a flexible microscopic modeling framework for flopping-mode spin qubits that captures the spatial structure of the double-well confinement and magnetic-field-gradient profile beyond conventional low-energy approximations. Our model enables a direct mapping from the device geometry to qubit parameters and metrics. By using this approach, we simulate electric dipole spin resonance-based single-qubit control and evaluate the frequency and spectral purity of the Rabi oscillations across different parameter regimes. Our analysis reveals a fundamental tradeoff between fast electrical driving and clean single-mode Rabi oscillations. We also investigate two-qubit control by considering two capacitively coupled flopping-mode qubits and derive the corresponding exchange interaction with an appropriately restricted configuration interaction treatment. Our approach reveals the interplay between the spatial profile of the double-well confinement, magnetic field gradient, and Coulomb interaction, which together govern the effective exchange coupling strength. Our microscopic modeling framework enables efficient exploration of device geometries and provides design guidelines for optimizing flopping-mode spin qubits in realistic architectures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_20510 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Microscopic modeling of flopping-mode quantum dot spin qubits Kinikar, Ashutosh Levajac, Vukan Moors, Kristof Simion, George Benito, Monica Soree, Bart Mesoscale and Nanoscale Physics We present a flexible microscopic modeling framework for flopping-mode spin qubits that captures the spatial structure of the double-well confinement and magnetic-field-gradient profile beyond conventional low-energy approximations. Our model enables a direct mapping from the device geometry to qubit parameters and metrics. By using this approach, we simulate electric dipole spin resonance-based single-qubit control and evaluate the frequency and spectral purity of the Rabi oscillations across different parameter regimes. Our analysis reveals a fundamental tradeoff between fast electrical driving and clean single-mode Rabi oscillations. We also investigate two-qubit control by considering two capacitively coupled flopping-mode qubits and derive the corresponding exchange interaction with an appropriately restricted configuration interaction treatment. Our approach reveals the interplay between the spatial profile of the double-well confinement, magnetic field gradient, and Coulomb interaction, which together govern the effective exchange coupling strength. Our microscopic modeling framework enables efficient exploration of device geometries and provides design guidelines for optimizing flopping-mode spin qubits in realistic architectures. |
| title | Microscopic modeling of flopping-mode quantum dot spin qubits |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2604.20510 |