Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads
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arXiv
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| Format: | Preprint |
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2022
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| author | Bargerbos, Arno Pita-Vidal, Marta Žitko, Rok Splitthoff, Lukas J. Grünhaupt, Lukas Wesdorp, Jaap J. Liu, Yu Kouwenhoven, Leo P. Aguado, Ramón Andersen, Christian Kraglund Kou, Angela van Heck, Bernard |
| author_facet | Bargerbos, Arno Pita-Vidal, Marta Žitko, Rok Splitthoff, Lukas J. Grünhaupt, Lukas Wesdorp, Jaap J. Liu, Yu Kouwenhoven, Leo P. Aguado, Ramón Andersen, Christian Kraglund Kou, Angela van Heck, Bernard |
| contents | We use a hybrid superconductor-semiconductor transmon device to perform spectroscopy of a quantum dot Josephson junction tuned to be in a spin-1/2 ground state with an unpaired quasiparticle. Due to spin-orbit coupling, we resolve two flux-sensitive branches in the transmon spectrum, depending on the spin of the quasi-particle. A finite magnetic field shifts the two branches in energy, favoring one spin state and resulting in the anomalous Josephson effect. We demonstrate the excitation of the direct spin-flip transition using all-electrical control. Manipulation and control of the spin-flip transition enable the future implementation of charging energy protected Andreev spin qubits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2208_09314 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads Bargerbos, Arno Pita-Vidal, Marta Žitko, Rok Splitthoff, Lukas J. Grünhaupt, Lukas Wesdorp, Jaap J. Liu, Yu Kouwenhoven, Leo P. Aguado, Ramón Andersen, Christian Kraglund Kou, Angela van Heck, Bernard Mesoscale and Nanoscale Physics Superconductivity Quantum Physics We use a hybrid superconductor-semiconductor transmon device to perform spectroscopy of a quantum dot Josephson junction tuned to be in a spin-1/2 ground state with an unpaired quasiparticle. Due to spin-orbit coupling, we resolve two flux-sensitive branches in the transmon spectrum, depending on the spin of the quasi-particle. A finite magnetic field shifts the two branches in energy, favoring one spin state and resulting in the anomalous Josephson effect. We demonstrate the excitation of the direct spin-flip transition using all-electrical control. Manipulation and control of the spin-flip transition enable the future implementation of charging energy protected Andreev spin qubits. |
| title | Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads |
| topic | Mesoscale and Nanoscale Physics Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2208.09314 |