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TT: Fachverband Tiefe Temperaturen
TT 66: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics
TT 66.11: Talk
Thursday, March 21, 2024, 12:15–12:30, H 3005
On-demand population of Andreev levels by their ionization in the presence of Coulomb blockade — •Aleksandr Svetogorov1, Wolfgang Belzig1, Pavel Kurilovich2, Vladislav Kurilovich2, Michel Devoret2, and Leonid Glazman2 — 1Universität Konstanz, Konstanz, Germany — 2Yale University, New Haven, USA
A mechanism to deterministically prepare a nanowire Josephson junction in an odd parity state is proposed. The mechanism involves population of two Andreev levels by a resonant microwave drive breaking a Cooper pair, and a subsequent ionization of one of the levels by the same drive. Robust preparation of the odd state is allowed by a residual Coulomb repulsion in the junction. A similar resonant process can also be used to prepare the junction in the even state. Our theory explains a recent experiment [1].
[1] J. J. Wesdorp et al., Phys. Rev. Lett. 131 (2023) 117001
Keywords: Andreev spin qubit; Coulomb blocade; Andreev level ionization; Odd state preparation