Josephson energy of superconducting junctions: amorphous versus crystalline tunnel barriers

Wanting Zhang, Aldilene Saraiva-Souza, Félix Beaudoin +3

The Josephson energy $E_J$ is a key parameter governing the properties of transmon superconducting qubits. In Al/AlO${}_x$/Al junctions, $E_J$ is set by electron tunneling through an…