@article{8c0b3554e2214b8e997e1d6da885e30e,
title = "Spectroscopy of Spin-Split Andreev Levels in a Quantum Dot with Superconducting Leads",
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.",
author = "Arno Bargerbos and Marta Pita-Vidal and Rok {\v Z}itko and Splitthoff, {Lukas J.} and Lukas Gr{\"u}nhaupt and Wesdorp, {Jaap J.} and Yu Liu and Kouwenhoven, {Leo P.} and Ram{\'o}n Aguado and Andersen, {Christian Kraglund} and Angela Kou and {Van Heck}, Bernard",
note = "We acknowledge fruitful discussion with Yuli Nazarov and Valla Fatemi. We thank Peter Krogstrup for guidance in the material growth. This research is cofunded by the allowance for Top consortia for Knowledge and Innovation (TKI{\textquoteright}s) from the Dutch Ministry of Economic Affairs, research project Scalable circuits of Majorana qubits with topological protection (i39, SCMQ) with Project No. 14SCMQ02, from the Dutch Research Council (NWO), and the Microsoft Quantum initiative. R. {\v Z}. acknowledges the support of the Slovenian Research agency (ARRS) under P1-0416 and J1-3008. R. A. acknowledges support from the Spanish Ministry of Science and Innovation through Grants No. PGC2018-097018-B-I00 and No. PID2021-125343NB-I00 and from the CSIC Research Platform on Quantum Technologies PTI-001. C. K. A additionally acknowledges support from the Dutch Research Council (NWO). B. v. H. was partially supported by the Dutch Research Council (NWO).",
year = "2023",
month = sep,
day = "1",
doi = "10.1103/PhysRevLett.131.097001",
language = "English (US)",
volume = "131",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "9",
}