Superconducting Qubits, Resonators and Beyond

Superconducting devices, containing Josephson junctions and resonant structures, are at the forefront of quantum information science today. These devices, built with various  nanofabrication  techniques  and  resulting  in  tunable  and  highly  nonlinear  resonances, uncover  also exciting  physics  of  the  superconducting  state  and surrounding  dielectric  and  magnetic  environment.  I  will  review  some  of  the recent progress in  the  field  and  present  some  of  our  results on both quantum optical control and subsequent metrology of two-level  defect  states and magnetic flux noise in the environment.