We introduce an alternative method for fabricating all-aluminum Josephson junctions with highly transmitted conduction channels. Such properties are typically associated with structures requiring intricate fabrication processes, such as atomic contacts or hybrid junctions based on semiconducting nanowires and two-dimensional materials. In contrast, our approach relies solely on standard nanofabrication techniques. The resulting devices exhibit a key signature of high-transmission junctions—multiple Andreev reflections—in their current-voltage characteristics. Furthermore, we propose a straightforward superconducting circuit design based on these junctions, enabling the implementation of a parity-protected qubit.

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• Andreev bound states
• Andreev reflection
• Quantum circuits
• Quantum information with solid state qubits
• Josephson junctions
• Low-temperature superconductors
• Superconducting devices
• Sample preparation