Time-dependent driving and topological protection in the fractional Josephson effect
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866916298132291584 |
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| author | Kenawy, Ahmed Hassler, Fabian Riwar, Roman-Pascal |
| author_facet | Kenawy, Ahmed Hassler, Fabian Riwar, Roman-Pascal |
| contents | The control of any type of quantum hardware invariably necessitates time-dependent driving. If the basis depends on the control parameter, the presence of a time-dependent control field yields an extra term in the Schrödinger equation that is often neglected. Here, we examine the effect of this term in a flux-controlled Majorana junction. We show that a time-varying flux gives rise to an electromotive force which is amplified when truncating to the junction's low-energy degrees of freedom. As a result, it compromises the robustness of the ground-state degeneracy present in the absence of the drive. The resulting flattening of the energy spectrum can be measured by a strong suppression of the dc supercurrent. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_09440 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Time-dependent driving and topological protection in the fractional Josephson effect Kenawy, Ahmed Hassler, Fabian Riwar, Roman-Pascal Superconductivity Mesoscale and Nanoscale Physics The control of any type of quantum hardware invariably necessitates time-dependent driving. If the basis depends on the control parameter, the presence of a time-dependent control field yields an extra term in the Schrödinger equation that is often neglected. Here, we examine the effect of this term in a flux-controlled Majorana junction. We show that a time-varying flux gives rise to an electromotive force which is amplified when truncating to the junction's low-energy degrees of freedom. As a result, it compromises the robustness of the ground-state degeneracy present in the absence of the drive. The resulting flattening of the energy spectrum can be measured by a strong suppression of the dc supercurrent. |
| title | Time-dependent driving and topological protection in the fractional Josephson effect |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2306.09440 |