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. Because of spin-orbit coupling, we resolve two flux-sensitive branches in the transmon spectrum, depending on the spin of the quasiparticle. 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.
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. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 131:9(2023), pp. 1-7. [10.1103/PhysRevLett.131.097001]
Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads
van Heck, BernardUltimo
2023
Abstract
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. Because of spin-orbit coupling, we resolve two flux-sensitive branches in the transmon spectrum, depending on the spin of the quasiparticle. 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.File | Dimensione | Formato | |
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