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. 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.

Updated references. Main: 8 pages, 4 figures. Supplement: 19 pages, 13 figures

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Cited by in corpus (33)

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• Strong tunable coupling between two distant superconducting spin qubits
• High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
• Progress in superconductor-semiconductor topological Josephson junctions
• Blueprint for all-to-all connected superconducting spin qubits
• A quantum dot in germanium proximitized by a superconductor
• Strong nonlocal tuning of the current-phase relation of a quantum dot based Andreev molecule
• Spin-degeneracy breaking and parity transitions in three-terminal Josephson junctions
• Interplay between Majorana and Shiba states in a minimal Kitaev chain coupled to a superconductor
• Controllable odd-frequency Cooper pairs in multi-superconductor Josephson junctions
• Ground state phase diagram and "parity flipping'' microwave transitions in a gate-tunable Josephson Junction
• Supercurrent through an Andreev trimer
• The carbon nanotube gatemon qubit
• Impurity Knight shift in quantum dot Josephson junctions
• Opportunities for the direct manipulation of a phase-driven Andreev spin qubit
• Entangling distant systems via universal nonadiabatic passage
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• Many-body quantum dynamics of spin-orbit coupled Andreev states in a Zeeman field
• Andreev spin relaxation time in a shadow-evaporated InAs weak link
• Current Flow in Topological Insulator Josephson Junctions due to Imperfections
• Generalized transmon Hamiltonian for Andreev spin qubits
• Probing Magnetic and Triplet Correlations in Spin-Split Superconductors with Magnetic Impurities
• Microwave Andreev bound state spectroscopy in a semiconductor-based Planar Josephson junction
• YSR Bond Qubit in a Double Quantum Dot with cQED Operation
• Approaching the ultrastrong coupling regime between an Andreev level and a microwave resonator
• Spin-resolved nonlocal transport in proximitized Rashba nanowires
• Supercurrent from the imaginary part of the Andreev levels in non-Hermitian Josephson junctions
• Theory of superconducting proximity effect in hole-based hybrid semiconductor-superconductor devices
• Theory for electron and hole fine structure and Landé g-factors in lead chalcogenide nanowires
• Characterizing local Majorana properties using Andreev states
• Andreev spin qubit protected by Franck-Condon blockade
• Effects of electron-electron interaction and spin-orbit coupling on Andreev pair qubits in quantum dot Josephson junctions
• Kramers-protected hardware-efficient error correction with Andreev spin qubits