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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.06482 |
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| _version_ | 1866917318835044352 |
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| author | Benjadi, Sara M. Egger, Reinhold |
| author_facet | Benjadi, Sara M. Egger, Reinhold |
| contents | We study theoretical models for charge reflectometry and capacitive readout of the Majorana parity degree of freedom in Majorana box qubits, taking into account decoherence channels within the framework of the Lindblad master equation. Noting that a parity-dependent dynamical susceptibility $χ_z(ω)$ governs both readout schemes, we provide a general expression for $χ_z(ω)$ which covers the full crossover from the resonant regime to the off-resonant dispersive regime. In addition, we re-examine previous results which were obtained under a semiclassical factorization assumption. Using three different error measures, we show that this approximation is quantitatively justified in the dispersive regime. In the resonant regime, however, we find deviations from exact reference data, obtained by numerical solution for the steady state of the full Lindblad equation. These deviations are typically of the order of a few percent in the considered error measures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_06482 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Parity readout in Majorana box qubits from the dispersive to the resonant regime Benjadi, Sara M. Egger, Reinhold Strongly Correlated Electrons We study theoretical models for charge reflectometry and capacitive readout of the Majorana parity degree of freedom in Majorana box qubits, taking into account decoherence channels within the framework of the Lindblad master equation. Noting that a parity-dependent dynamical susceptibility $χ_z(ω)$ governs both readout schemes, we provide a general expression for $χ_z(ω)$ which covers the full crossover from the resonant regime to the off-resonant dispersive regime. In addition, we re-examine previous results which were obtained under a semiclassical factorization assumption. Using three different error measures, we show that this approximation is quantitatively justified in the dispersive regime. In the resonant regime, however, we find deviations from exact reference data, obtained by numerical solution for the steady state of the full Lindblad equation. These deviations are typically of the order of a few percent in the considered error measures. |
| title | Parity readout in Majorana box qubits from the dispersive to the resonant regime |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2603.06482 |