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arXiv · 2604.20510

Modeling of flopping-mode spin qubits: beyond the two-site model

Ashutosh Kinikar·Vukan Levajac·Kristof Moors·George Simion·Monica Benito·Bart Soree
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Abstract

We present a flexible modeling framework for flopping-mode spin qubits that captures the spatial structure of the double-well confinement and magnetic-field-gradient profile going beyond conventional low-energy descriptions. 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, and demonstrates that the standard two-site low-energy approximation can overestimate the Rabi frequency by up to $\sim$ 20\% in certain parameter regimes. 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 spatially resolved modelling framework enables efficient exploration of double-well confinement parameters and magnetic field gradient profiles, enabling a transparent mapping from spatial device properties to flopping-mode qubit parameters and quality metrics.

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Ashutosh Kinikar, Vukan Levajac, Kristof Moors, George Simion, Monica Benito, Bart Soree. 2026-04-22. Modeling of flopping-mode spin qubits: beyond the two-site model. https://doi.org/10.1063/5.0343213

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