The title of my talk will be: "Circuit quantum electrodynamics of granular aluminum resonators

by Ioan Pop (Karlsruhe Institute of Technology (KIT))

Wednesday 18 Jul 2018, 16:00 → 17:00 Europe/Rome

Aula Conversi (Dip. di Fisica - Edificio G. Marconi)

Granular Aluminum (grAl) is a self assembled material obtained by aluminum deposition under oxygen atmosphere, featuring an increase of the superconducting gap with increasing granularity. In this talk I will focus on the the nonlinear microwave properties of grAl. I will present a circuit quantum electrodynamics model to calculate the Kerr coefficients of grAl microwave resonators, starting from their nano-structure, and I will show measurements which support the model. I will argue that the measured quality factor of grAl resonators recommends it as a material for high-impedance quantum circuits, even though quasiparticle poisoning is a limiting factor to be addressed in future works.