Observation of Josephson Harmonics in Tunnel Junctions

Join a 46-minute seminar from the Qiskit Seminar Series exploring groundbreaking research on Josephson harmonics in tunnel junctions and their impact on quantum computing. Delve into the challenges of achieving fault-tolerant quantum computing with superconducting processors, focusing on the limitations of the traditional sin(phi) current-phase relation in aluminum oxide tunnel Josephson junctions. Learn how a mesoscopic model of tunneling through inhomogeneous AlOx barriers reveals significant higher Josephson harmonics contributions, leading to substantially improved predictions of transmon artificial atom energy spectra. Discover how engineered Josephson harmonics can reduce charge dispersion and associated errors in transmon qubits, with implications for quantum gates, parametric amplification, Floquet qubits, and protected Josephson Rhombus chains. Presented by Dennis Rieger, a PhD researcher specializing in hybrid applications of granular aluminum circuits, and Dennis Willsch, a postdoctoral researcher focused on quantum information processing and simulation at Jülich Supercomputing Centre.