Germanium quantum well Josephson field effect transistors and interferometers

Abstract

Hybrid superconductor-semiconductor structures attract increasing attention owing to a variety of potential applications in quantum computing devices. They can serve to the realization of topological superconducting systems, as well as gate-tunable superconducting quantum bits. Here we combine a SiGe/Ge/SiGe quantum-well heterostructure hosting high-mobility two-dimensional holes and aluminum superconducting leads to realize prototypical hybrid devices, such as Josephson field-effect transistors (JoFETs) and superconducting quantum interference devices (SQUIDs). We observe gate-controlled supercurrent transport with Ge channels as long as one micrometer and estimate the induced superconducting gap from tunnel spectroscopy measurements in superconducting point-contact devices. Transmission electron microscopy reveals the diffusion of Ge into the aluminum contacts, whereas no aluminum is detected in the Ge channel.

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Cited by in corpus (42)

• The germanium quantum information route
• A single-hole spin qubit
• A singlet triplet hole spin qubit in planar Ge
• A perspective on semiconductor-based superconducting qubits
• Parity-conserving Cooper-pair transport and ideal superconducting diode in planar Germanium
• Light effective hole mass in undoped Ge/SiGe quantum wells
• Hard superconducting gap in germanium
• Enhancement of Proximity Induced Superconductivity in a Planar Ge Hole Gas
• Josephson Junction Field-effect Transistors for Boolean Logic Cryogenic Applications
• Multiple Andreev reflections and Shapiro steps in a Ge-Si nanowire Josephson junction
• Ballistic supercurrent discretization and micrometer-long Josephson coupling in germanium
• Strong tunable coupling between two distant superconducting spin qubits
• A gate tunable transmon qubit in planar Ge
• Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field
• Planar Josephson junctions in germanium: Effect of cubic spin-orbit interaction
• Measurements of Phase Dynamics in Planar Josephson Junctions and SQUIDs
• High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
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• Majorana bound states in germanium Josephson junctions via phase control
• A quantum dot in germanium proximitized by a superconductor
• Gatemon qubit on a germanium quantum-well heterostructure
• Direct microwave spectroscopy of Andreev bound states in planar Ge Josephson junctions
• From nonreciprocal to charge-4e supercurrents in Ge-based Josephson devices with tunable harmonic content
• Dissipationless Nonlinearity in Quantum Material Josephson Diodes
• Microscopic analysis of proximity-induced superconductivity and metallization effects in superconductor-germanium hole nanowires
• Vanishing Zeeman energy in a two-dimensional hole gas
• Investigating microwave loss of SiGe using superconducting transmon qubits
• Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits
• Germanium-based hybrid semiconductor-superconductor topological quantum computing platforms: Disorder effects
• Wafer-scale CMOS-compatible graphene Josephson field-effect transistors
• Hybridization mechanism of the dual proximity effect in superconductor-topological insulator interfaces
• Effects of spin-orbit coupling and in-plane Zeeman fields on the critical current in two-dimensional hole gas SNS junctions
• Cryogenic Behavior of High-Permittivity Gate Dielectrics: The Impact of the Atomic Layer Deposition Temperature and the Lithographic Patterning Method
• Superconducting-semiconducting voltage-tunable qubits in the third dimension
• Model for missing Shapiro steps due to bias-dependent resistance
• A backgate for enhanced tunability of holes in planar germanium
• Impact of surface treatments on the transport properties of germanium 2DHGs
• Superconducting Proximity Effect in Two-Dimensional Hole Gases
• Phase transformation-induced superconducting aluminium-silicon alloy rings
• Solid-State Reactions at Niobium-Germanium Interfaces in Hybrid Superconductor-Semiconductor Devices
• Effect of disorder and strain on the operation of planar Ge hole spin qubits
• Supercurrent and multiple Andreev reflections in Ge hut nanowire Josephson Junctions