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| Format: | Preprint |
| Publié: |
2026
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| Accès en ligne: | https://arxiv.org/abs/2605.22460 |
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| _version_ | 1866916036488462336 |
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| author | Maiellaro, Alfonso |
| author_facet | Maiellaro, Alfonso |
| contents | We investigate the robustness of topological phases in a Kitaev ladder composed of two coupled superconducting chains under the perturbing influence of a finite charge current. By introducing an effective Hamiltonian depending on the quasiparticle momentum induced by the current, we show that the two-mode topological phase, present in the isolated ladder, is fragile against a finite current flux. To characterize this behavior, we combine bulk topological invariants with real-space diagnostics, including the edge-edge quantum conditional mutual information Iee, which provides an entanglement-based signature of topological order. Our results provide an effective framework to describe how current injection and measurement processes can affect topological protection in superconducting nanostructures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_22460 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Current-driven reduction of topological protection in multichannel superconductors Maiellaro, Alfonso Superconductivity We investigate the robustness of topological phases in a Kitaev ladder composed of two coupled superconducting chains under the perturbing influence of a finite charge current. By introducing an effective Hamiltonian depending on the quasiparticle momentum induced by the current, we show that the two-mode topological phase, present in the isolated ladder, is fragile against a finite current flux. To characterize this behavior, we combine bulk topological invariants with real-space diagnostics, including the edge-edge quantum conditional mutual information Iee, which provides an entanglement-based signature of topological order. Our results provide an effective framework to describe how current injection and measurement processes can affect topological protection in superconducting nanostructures. |
| title | Current-driven reduction of topological protection in multichannel superconductors |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2605.22460 |