Flip-chip-based microwave spectroscopy of Andreev bound states in a planar Josephson junction

Abstract

We demonstrate a flip-chip-based approach to microwave measurements of Andreev bound states in a gate-tunable planar Josephson junction using inductively-coupled superconducting low-loss resonators. By means of electrostatic gating, we present control of both the density and transmission of Andreev bound states. Phase biasing of the device shifted the resonator frequency, consistent with the modulation of supercurrent in the junction. Two-tone spectroscopy measurements revealed an isolated Andreev bound state consistent with an average induced superconducting gap of $184\mu \mathrm{eV}$ and a gate-tunable transmission approaching $0.98$. Our results represent the feasibility of using the flip-chip technique to address and study Andreev bound states in planar Josephson junctions, and they give a promising path towards microwave applications with superconductor-semiconductor two-dimensional materials.

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• Direct microwave spectroscopy of Andreev bound states in planar Ge Josephson junctions
• Zeeman and Orbital Driven Phase Transitions in Planar Josephson Junctions
• Quartet Tomography in Multiterminal Josephson Junctions
• Flip-chip-based fast inductive parity readout of a planar superconducting island
• Detection of Majorana zero modes bound to Josephson vortices in planar superconductor-topological insulator-superconductor junctions
• Microwave Andreev bound state spectroscopy in a semiconductor-based Planar Josephson junction
• Exploring the energy spectrum of a four-terminal Josephson junction: Towards topological Andreev band structures
• Fermionic Quantum Simulation on Andreev Bound State Superlattices
• Integration of graphene-based superconducting quantum circuits in 3D cavity
• Finite Length Effects and Coulomb Interaction in Ge Quantum Well-Based Josephson Junctions Probed with Microwave Spectroscopy
• Determination of the current-phase relation of an InAs 2DEG Josephson junction with a microwave resonator
• Effects of electron-electron interaction and spin-orbit coupling on Andreev pair qubits in quantum dot Josephson junctions