Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads

• URL: http://arxiv.org/abs/2208.09314v2
• Date: Mon, 12 Sep 2022 11:01:24 GMT
• Title: Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads
• Authors: Arno Bargerbos, Marta Pita-Vidal, Rok \v{Z}itko, Lukas J. Splitthoff, Lukas Gr\"unhaupt, Jaap J. Wesdorp, Yu Liu, Leo P. Kouwenhoven, Ram\'on Aguado, Christian Kraglund Andersen, Angela Kou, Bernard van Heck
• Abstract summary: 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. A finite magnetic field shifts the two branches in energy, favoring one spin state and resulting in the anomalous Josephson effect.
• Score: 2.6810058988728342
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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. 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.

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