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| Hauptverfasser: | , , , , , , , , |
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| Format: | Preprint |
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2026
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| Online-Zugang: | https://arxiv.org/abs/2601.12891 |
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| _version_ | 1866914263412506624 |
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| author | Huisman, Wietze D. Haaf, Sebastiaan L. D. ten Liu, Chun-Xiao Wang, Qingzhen Bordin, Alberto Evertsz', Florian J. Bennebroek Roovers, Bart Wimmer, Michael Goswami, Srijit |
| author_facet | Huisman, Wietze D. Haaf, Sebastiaan L. D. ten Liu, Chun-Xiao Wang, Qingzhen Bordin, Alberto Evertsz', Florian J. Bennebroek Roovers, Bart Wimmer, Michael Goswami, Srijit |
| contents | Quantum dot-superconductor hybrids have been established as a suitable platform for realizing Kitaev chains hosting Majorana bound states. Implementing these structures in a qubit architecture is expected to result in coherence times that scale exponentially with the lengths of the chains. To scale to longer systems, the phase differences between all superconducting segments in the chain need to be controlled. While this control has been demonstrated by using an external magnetic flux, ideally it can be achieved with control over intrinsic system parameters. In this work, we investigate whether the relevant phase differences can be tuned through the spin degree of freedom in each QD, or the chemical potential of the discrete bound states in the hybrid sections. We confirm that both these tuning knobs allow for controlling the phase difference in the couplings between neighbouring QDs, bypassing the requirement to tune an external flux. However, we find that the amplitude of the phase shifts can deviate from a discrete $π$-shift. We introduce a spatial variation in the spin-orbit field as a possible mechanism to explain the observed behaviour and comment on the consequences for experimentally creating long Kitaev chains. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_12891 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Using Andreev bound states and spin to remove domain walls in a Kitaev chain Huisman, Wietze D. Haaf, Sebastiaan L. D. ten Liu, Chun-Xiao Wang, Qingzhen Bordin, Alberto Evertsz', Florian J. Bennebroek Roovers, Bart Wimmer, Michael Goswami, Srijit Mesoscale and Nanoscale Physics Superconductivity Quantum dot-superconductor hybrids have been established as a suitable platform for realizing Kitaev chains hosting Majorana bound states. Implementing these structures in a qubit architecture is expected to result in coherence times that scale exponentially with the lengths of the chains. To scale to longer systems, the phase differences between all superconducting segments in the chain need to be controlled. While this control has been demonstrated by using an external magnetic flux, ideally it can be achieved with control over intrinsic system parameters. In this work, we investigate whether the relevant phase differences can be tuned through the spin degree of freedom in each QD, or the chemical potential of the discrete bound states in the hybrid sections. We confirm that both these tuning knobs allow for controlling the phase difference in the couplings between neighbouring QDs, bypassing the requirement to tune an external flux. However, we find that the amplitude of the phase shifts can deviate from a discrete $π$-shift. We introduce a spatial variation in the spin-orbit field as a possible mechanism to explain the observed behaviour and comment on the consequences for experimentally creating long Kitaev chains. |
| title | Using Andreev bound states and spin to remove domain walls in a Kitaev chain |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2601.12891 |