Aranya Goswami

Abstract Josephson tunnel junctions are essential elements of superconducting quantum circuits. The standard analysis of these circuits presumes a 2π-periodic sinusoidal potential for a tunnel junction, but higher-order corrections to this Josephson potential, often referred to as harmonics, cause deviations from the expected circuit behaviour.

Abstract Increasing the density of superconducting circuits requires compact components, however, superconductor-based capacitors typically perform worse as dimensions are reduced due to loss at surfaces and interfaces. Here, parallel plate capacitors composed of aluminum-contacted, crystalline silicon fins are shown to be a promising technology for use in superconducting circuits by evaluating the performance of lumped element resonators and transmon qubits.

RESULTS AND DISCUSSION Growth and transport Epitaxial thin films of rock-salt LuSb (6.055 Å) (18) were synthesized on a nearly lattice-matched GaSb substrates (6.096 Å) with a thin GaSb epitaxial buffer layer using molecular-beam epitaxy (MBE). The c(2 × 6) reconstruction of the Sb-rich GaSb(001) surface immediately changes to a (1 × 1) reconstruction at the beginning of the deposition of LuSb atomic layers, shown in Fig. 1B.